Document:

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                                                                    EXHIBIT 4.13

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                          EXODUS COMMUNICATIONS, INC.
                                   As Issuer

                  TO CHASE MANHATTAN BANK AND TRUST COMPANY,
                             NATIONAL ASSOCIATION
                                  As Trustee

                                   INDENTURE

                         Dated as of December 1, 1999

               DOLLAR DENOMINATED 10 3/4% SENIOR NOTES DUE 2009
                EURO DENOMINATED 10 3/4% SENIOR NOTES DUE 2009

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                               TABLE OF CONTENTS

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<S>                                                                                                                     <C>
RECITALS OF THE ISSUER................................................................................................     1
     ARTICLE ONE  Definitions and Other Provisions of General Application.............................................     1
          SECTION 101.  Definitions...................................................................................     1
          SECTION 102.  Compliance Certificates and Opinions..........................................................    22
          SECTION 103.  Form of Documents Delivered to Trustee........................................................    22
          SECTION 104.  Acts of Holders; Record Date..................................................................    23
          SECTION 105.  Notices, Etc., to Trustee and Issuer..........................................................    25
          SECTION 106.  Notice to Holders; Waiver.....................................................................    25
          SECTION 107.  Conflict with Trust Indenture Act.............................................................    26
          SECTION 108.  Effect of Headings and Table of Contents......................................................    26
          SECTION 109.  Successors and Assigns........................................................................    26
          SECTION 110.  Separability Clause...........................................................................    26
          SECTION 111.  Benefits of Indenture.........................................................................    26
          SECTION 112.  Governing Law.................................................................................    26
          SECTION 113.  Legal Holidays................................................................................    26

     ARTICLE TWO  Security Forms......................................................................................    26
          SECTION 201.  Forms Generally; Initial Forms of Rule 144A and Regulation S Securities.......................    27
          SECTION 202.  Form of Face of Security......................................................................    27
          SECTION 203.  Form of Reverse of Security...................................................................    30
          SECTION 204.  Form of Trustee's Certificate of Authentication...............................................    35

     ARTICLE THREE  The Securities....................................................................................    35
          SECTION 301.  Title and Terms...............................................................................    35
          SECTION 302.  Denominations.................................................................................    36
          SECTION 303.  Execution, Authentication, Delivery and Dating................................................    36
          SECTION 304.  Temporary Securities..........................................................................    37
          SECTION 305.  Global Securities.............................................................................    38
          SECTION 306.  Registration, Registration of Transfer and Exchange Generally; Restrictions on Transfer and
                        Exchange; Securities Act Legends..............................................................    39
          SECTION 307.  Mutilated, Destroyed, Lost and Stolen Securities..............................................    43
          SECTION 308.  Payment of Interest; Interest Rights Preserved................................................    43
          SECTION 309.  Persons Deemed Owners.........................................................................    44
          SECTION 310.  Cancellation..................................................................................    45
          SECTION 311.  CUSIP Numbers.................................................................................    45
          SECTION 312.  Computation of Interest.......................................................................    45

     ARTICLE FOUR  Satisfaction and Discharge.. .....................................................................     45
          SECTION 401.  Satisfaction and Discharge of Indenture.......................................................    45
          SECTION 402.  Application of Trust Money....................................................................    46

     ARTICLE FIVE  Remedies..........................................................................................     47
          SECTION 501.  Events of Default.............................................................................    47
          SECTION 502.  Acceleration of Maturity; Rescission and Annulment............................................    48
          SECTION 503.  Collection of Indebtedness and Suits for Enforcement by Trustee...............................    49
          SECTION 504.  Trustee May File Proofs of Claim..............................................................    50
          SECTION 505.  Trustee May Enforce Claims Without Possession of Securities...................................    50
          SECTION 506.  Application of Money Collected................................................................    51
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     <S>                                                                                                                  <C>
          SECTION 507.  Limitation on Suits...........................................................................    51
          SECTION 508.  Unconditional Right of Holders to Receive Principal, Premium and Interest.....................    52
          SECTION 509.  Restoration of Rights and Remedies............................................................    52
          SECTION 510.  Rights and Remedies Cumulative................................................................    52
          SECTION 511.  Delay or Omission Not Waiver..................................................................    52
          SECTION 512.  Control by Holders............................................................................    52
          SECTION 513.  Waiver of Past Defaults.......................................................................    53
          SECTION 514.  Undertaking for Costs.........................................................................    53
          SECTION 515.  Waiver of Stay, or Extension Laws.............................................................    53

     ARTICLE SIX  The Trustee........................................................................................     54
          SECTION 601.  Certain Duties and Responsibilities...........................................................    54
          SECTION 602.  Notice of Defaults............................................................................    55
          SECTION 603.  Certain Rights of Trustee.....................................................................    55
          SECTION 604.  Not Responsible for Recitals or Issuance of Securities........................................    56
          SECTION 605.  May Hold Securities...........................................................................    56
          SECTION 606.  Money Held in Trust...........................................................................    56
          SECTION 607.  Compensation and Reimbursement................................................................    56
          SECTION 608.  Disqualification; Conflicting Interests.......................................................    57
          SECTION 609.  Corporate Trustee Required; Eligibility.......................................................    57
          SECTION 610.  Resignation and Removal; Appointment of Successor.............................................    58
          SECTION 611.  Acceptance of Appointment by Successor........................................................    59
          SECTION 612.  Merger, Conversion, Consolidation or Succession to Business...................................    59
          SECTION 613.  Preferential Collection of Claims Against Issuer..............................................    60
          SECTION 614.  Appointment of Authenticating Agent...........................................................    60

     ARTICLE SEVEN  Holders' Lists and Reports by Trustee and Issuer.................................................     61
          SECTION 701.  Issuer to Furnish Trustee Names and Addresses of Holders......................................    61
          SECTION 702.  Preservation of Information; Communications to Holders........................................    61
          SECTION 703.  Reports by Trustee............................................................................    62
          SECTION 704.  Reports by the Issuer.........................................................................    62

     ARTICLE EIGHT  Consolidation, Merger, Conveyance, Transfer or Lease.............................................     63
          SECTION 801.  Issuer may Consolidate, Etc. Only on Certain Terms............................................    63
          SECTION 802.  Successor Substituted.........................................................................    64

     ARTICLE NINE  Supplemental Indentures...........................................................................     64
          SECTION 901.  Supplemental Indentures Without Consent of Holders............................................    64
          SECTION 902.  Supplemental Indentures with Consent of Holders...............................................    64
          SECTION 903.   Execution of Supplemental Indentures.........................................................    65
          SECTION 904.  Effect of Supplemental Indentures.............................................................    65
          SECTION 905.  Conformity with Trust Indenture Act...........................................................    65
          SECTION 906.  Reference in Securities to Supplemental Indentures............................................    66

     ARTICLE TEN  Covenants..........................................................................................     66
          SECTION 1001.  Payment of Principal, Premium and Interest...................................................    66
          SECTION 1002.  Maintenance of Office or Agency..............................................................    66
          SECTION 1003.  Money for Security Payments to Be Held in Trust..............................................    66
          SECTION 1004.  Existence....................................................................................    67
          SECTION 1005.  Maintenance of Properties....................................................................    68
          SECTION 1006.  Payment of Taxes and Other Claims............................................................    68
          SECTION 1007.  Maintenance of Insurance.....................................................................    68
          SECTION 1008.  Limitation on Debt...........................................................................    68
          SECTION 1009. Limitation on Sale-Leaseback Transactions.....................................................    70
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     <S>                                                                                                                  <C>
          SECTION 1010.  Limitation on Guarantees of Issuer Debt by Restricted Subsidiaries...........................    70
          SECTION 1011.  Limitation on Restricted Payments............................................................    71
          SECTION 1012.  Limitation on Dividend and Other Payment Restrictions Affecting Restricted Subsidiaries......    74
          SECTION 1013.  Limitation on Liens..........................................................................    75
          SECTION 1014.  Limitation on Issuance of Capital Stock of Restricted Subsidiaries...........................    76
          SECTION 1015.  Asset Sales..................................................................................    77
          SECTION 1016.  Change of Control............................................................................    78
          SECTION 1017.  Transactions with Affiliates and Related Persons.............................................    79
          SECTION 1018.  Unrestricted Subsidiaries....................................................................    79
          SECTION 1019.  Provision of Financial Information...........................................................    80
          SECTION 1020.  Statement by Officers as to Default; Compliance Certificates.................................    80
          SECTION 1021.  Waiver of Certain Covenants..................................................................    81

     ARTICLE ELEVEN  Redemption of Securities.........................................................................    81
          SECTION 1101.  Right of Redemption..........................................................................    81
          SECTION 1102.  Applicability of Article.....................................................................    81
          SECTION 1103.  Election to Redeem; Notice to Trustee........................................................    81
          SECTION 1104.  Selection by Trustee of Securities to Be Redeemed............................................    82
          SECTION 1105.  Notice of Redemption.........................................................................    82
          SECTION 1106.  Deposit of Redemption Price..................................................................    83
          SECTION 1107.  Securities Payable on Redemption Date........................................................    83
          SECTION 1108.  Securities Redeemed in Part..................................................................    83

     ARTICLE TWELVE  Defeasance and Covenant Defeasance...............................................................    84
          SECTION 1201.  Issuer's Option to Effect Defeasance or Covenant Defeasance..................................    84
          SECTION 1202.  Defeasance and Discharge.....................................................................    84
          SECTION 1203.  Covenant Defeasance..........................................................................    84
          SECTION 1204.  Conditions to Defeasance or Covenant Defeasance..............................................    85
          SECTION 1205.  Deposited Money and U.S. Government Obligations to Be Held in Trust; Other
                         Miscellaneous Provisions                                                                         86
          SECTION 1206.  Reinstatement................................................................................    87
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                               TABLE OF CONTENTS
                                  (continued)

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                               TABLE OF CONTENTS
                                  (continued)

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ANNEX A   -  Form of Regulation S Certificate.......................    A-1
ANNEX B   -  Form of Restricted Securities Certificate..............    B-1
ANNEX C   -  Form of Unrestricted Securities Certificate............    C-1

EXHIBIT A -  Form of Exchange and Registration Rights Agreement
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                          Exodus Communications, Inc.
              Reconciliation and tie between Trust Indenture Act
              of 1939 and Indenture, dated as of December 1, 1999

Trust Indenture                                                  Indenture
Act Section                                                        Section
-----------                                                        -------

(S) 310(a)(1).............................................             609
         (a)(2)...........................................             609
         (a)(3)...........................................  Not Applicable
         (a)(4)...........................................  Not Applicable
         (b)..............................................             608
         .................................................             610
(S) 311(a)................................................             613
         (b)..............................................             613
(S) 312(a)................................................             701
         .................................................             702
         (b)..............................................             702
         (c)..............................................             702
         (b)..............................................             703
         (c)..............................................             703
         (d)..............................................             703
(S) 314(a)................................................             704
         (a)(4)...........................................            1022
         (b)..............................................            1302
         (c)(1)...........................................            1022
         (c)(2)...........................................            1020
         (c)(3)...........................................  Not Applicable
         (d)..............................................            1303
         (e)..............................................            1020

______________________

Note:  This reconciliation and tie shall not, for any purpose, be deemed to be a
part of the Indenture.

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Trust Indenture                                                    Indenture
Act Section                                                          Section
-----------                                                          -------

(S) 315(a)..................................................             601
         (b)................................................             602
         (c)................................................             601
         (d)................................................             601
         (d)(1).............................................             514
         (e)................................................             514
(S) 316(a)..................................................             502
         (a)(1)(A)..........................................             512
         (a)(1)(B)..........................................             513
         (a)(2).............................................  Not Applicable
         (b)................................................             508
(S) 317(a)(1)...............................................             503
         (a)(2).............................................             504
         (b)................................................            1003
(S) 318(a)..................................................             107

___________________
Note:  This reconciliation and tie shall not

                                     -vii-
<PAGE>

     INDENTURE, dated as of December 1, 1999, between Exodus Communications,
Inc., a corporation duly organized and existing under the laws of the State of
Delaware, having its principal executive offices at 2831 Mission College
Boulevard, Santa Clara, California 95054 (the "Issuer"), and Chase Manhattan
Bank and Trust Company, National Association, a national banking association, as
Trustee (herein called the "Trustee") having its principal executive offices at
101 California Street, Suite 2725, San Francisco, CA 94111.

                                  RECITALS OF THE ISSUER

     The Issuer has duly authorized the creation of an issue of its  Dollar
Denominated 10 3/4 Senior Notes due 2009 (the "Dollar Securities")  and the Euro
Denominated 10 3/4 Senior Notes due 2009 (the "Euro Securities" and together
with the Dollar Securities, the "Securities") of substantially the tenor and
amount hereinafter set forth, and to provide therefor the Issuer has duly
authorized the execution and delivery of this Indenture.  The Securities may
consist of Original Securities, Additional Securities and/or Exchange
Securities, each as defined herein.  The Original Securities, Additional
Securities and Exchange Securities, as well as Dollar Securities and Euro
Securities, shall rank pari passu with one another and shall together constitute
a single class and series of securities.

     All things necessary to make the Securities, when executed by the Issuer
and authenticated and delivered hereunder and duly issued by the Issuer, the
valid obligations of the Issuer, and to make this Indenture a valid agreement of
the Issuer, in accordance with their and its terms, have been done.

     NOW, THEREFORE, THIS INDENTURE WITNESSETH:

     For and in consideration of the premises and the purchase of the Securities
by the Holders thereof, it is mutually covenanted and agreed, for the equal and
proportionate benefit of all Holders of the Securities, as follows:

                                  ARTICLE ONE

                       Definitions and Other Provisions
                            of General Application

     SECTION 101.  Definitions.  For all purposes of this Indenture, except as
                   -----------
otherwise expressly provided or unless the context otherwise requires:

          (1)  the terms defined in this Article have the meanings assigned to
     them in this Article and include the plural as well as the singular;

          (2)  all other terms used herein which are defined in the Trust
     Indenture Act, either directly or by reference therein, have the meanings
     assigned to them therein;
<PAGE>

          (3)  all accounting terms not otherwise defined herein have the
     meanings assigned to them in accordance with generally accepted accounting
     principles (whether or not such is indicated herein), and, except as
     otherwise herein expressly provided, the term "generally accepted
     accounting principles" with respect to any computation required or
     permitted hereunder shall mean such accounting principles as are generally
     accepted in the United States as consistently applied by the Issuer at the
     Closing Date;

          (4)  unless otherwise specifically set forth herein, all calculations
     or determinations of a Person shall be performed or made on a consolidated
     basis in accordance with generally accepted accounting principles but shall
     not include the accounts of Unrestricted Subsidiaries, except to the extent
     of dividends and distributions actually paid to an Issuer or a Restricted
     Subsidiary;

          (5)  the words "herein", "hereof" and "hereunder" and other words of
     similar import refer to this Indenture as a whole and not to any particular
     Article, Section or other subdivision;

          (6)  unless the context otherwise requires, any reference to a
     "Clause," an "Article" or a "Section", or to an "Annex" or a "Schedule",
     refers to a Clause, an Article or Section of, or to an Annex or a Schedule
     attached to, this Indenture, as the case may be; and

          (7)  unless the context otherwise requires, any reference to a
     statute, rule or regulation refers to the same (including any successor
     statute, rule or regulation thereto) as it may be amended from time to
     time.

     Certain terms, used principally in Article Six, are defined in that
Article.

     "Acquisition Debt" means Debt of a Person existing at the time such Person
becomes a Restricted Subsidiary or assumed in connection with an Asset
Acquisition, and not Incurred in connection with, or in anticipation of, such
Person becoming a Restricted Subsidiary or such Asset Acquisition.

     "Additional Securities" means Dollar Securities issued by the Issuer after
the Closing Date subject to the terms and conditions of this Indenture in an
aggregate principal amount not to exceed $100.0 million and any Dollar
Securities of like terms and tenor issued in exchange therefor (including any
Successor Securities in respect thereof).

     "Affiliate" of any Person means any other Person directly or indirectly
controlling or controlled by or under direct or indirect common control with
such Person.  For the purposes of this definition, "control" when used with
respect to any Person means the power to direct the management and policies of
such Person, directly or indirectly, whether through the ownership of
<PAGE>

voting securities, by contract or otherwise; and the terms "controlling" and
"controlled" have meanings correlative to the foregoing.

     "Agent Member" means any member of, or participant in, a Depositary.

     "Applicable Procedures" means, with respect to any transfer or transaction
involving a Global Security or beneficial interest therein, the rules and
procedures of any Depositary for such Security, Euroclear and Cedelbank, in each
case to the extent applicable to such transaction and as in effect at the time
of such transfer or transaction.

     "Asset Acquisition" means an acquisition by the Issuer or any of its
Restricted Subsidiaries of the property and assets of any Person other than the
Issuer or any of its Restricted Subsidiaries that constitute substantially all
of a division or line of business of such Person; provided that the property and
assets acquired are to be used in the System and Network Management Business.

     "Asset Sale" by any Person means any transfer, conveyance, sale, lease,
license or other disposition by such Person or any of its Restricted
Subsidiaries (including a consolidation or merger or other sale of any such
Restricted Subsidiary with, into or to another Person in a transaction in which
such Restricted Subsidiary ceases to be a Restricted Subsidiary) (collectively a
"transfer") of (I) shares of Capital Stock (other than directors' qualifying
shares) or other ownership interests of a Restricted Subsidiary of such Person,
(II) all or substantially all of the assets of such Person or any of its
Restricted Subsidiaries, or (III) any other property, assets or rights
(including intellectual property rights) of such Person or any of its Restricted
Subsidiaries outside of the ordinary course of business; provided that "Asset
Sale" shall not include (A) any transfer of all or substantially all of the
assets of the Issuer in a transaction that is made in compliance with the
requirements of provisions of Article Eight of this Indenture (B) any transfer
by the Issuer to any Wholly Owned Restricted Subsidiary or by any Wholly Owned
Restricted Subsidiary to any other Wholly Owned Restricted Subsidiary or to the
Issuer in a manner that does not otherwise violate the terms of this Indenture,
(C) transfers made in compliance with the requirements of Section 1011, (D)
transfers constituting the granting of a Permitted Lien, (E) exchanges of
equipment used in the System and Network Management Business for other equipment
to be used in the System and Network Management Business; provided any such
exchange for equipment with a fair market value in excess of $2.0 million must
be approved by the Issuer's Board of Directors, and (F) transfers of assets,
property or other rights (including intellectual property rights) with a fair
market value of less than $2.0 million.

     "Average Life" means, at any date of determination with respect to any debt
security, the quotient obtained by dividing (i) the sum of the products of (a)
the number of years from the date of determination to the dates of each
successive scheduled principal payment of such debt security and (b) the amount
of such principal payment, by (ii) the sum of all such principal payments.

     "Authenticating Agent" means any Person authorized by the Trustee pursuant
to Section 614 to act on behalf of the Trustee to authenticate Securities.

                                      -3-
<PAGE>

     "Board of Directors" means either the board of directors of the Issuer or
any duly authorized committee of that board.

     "Board Resolution" means a copy of a resolution certified by the Secretary
or an Assistant Secretary of the relevant Issuer to have been duly adopted by
the Board of Directors and to be in full force and effect on the date of such
certification, and delivered to the Trustee.

     "Business Day" means each Monday, Tuesday, Wednesday, Thursday and Friday
which is not a day on which banking institutions in The City of New York, New
York and San Francisco, California are authorized or obligated by law or
executive order to close.

     "Capital Lease Obligation" of any Person means the obligation to pay rent
or other payment amounts under a lease of (or other Debt arrangements conveying
the right to use) real or personal property of such Person which is required to
be classified and accounted for as a capital lease or a liability on the face of
a balance sheet of such Person in accordance with GAAP.  The principal amount of
such obligation shall be the capitalized amount thereof that would appear on the
face of a balance sheet of such Person in accordance with GAAP.

     "Capital Stock" of any Person means any and all shares, interests,
participations or other equivalents (however designated) of corporate stock or
other equity participations, including partnership interests, whether general or
limited, of such Person.

     "Cash Equivalents" means (i) securities issued or directly and fully
guaranteed or insured by the United States government or any agency or
instrumentality thereof (provided that the full faith and credit of the United
States is pledged in support thereof) having maturities of six months from the
date of acquisition, (ii) certificates of deposit with maturities of not more
than six months or less from the date of acquisition, bankers' acceptances with
maturities not exceeding six months and overnight bank deposits, in each case
with any domestic commercial bank having capital and surplus in excess of $500.0
million and a Thompson Bank Watch Rating of "B" or better, (iii) repurchase
obligations with a term of not more than seven days for underlying securities of
the types described in clauses (i) and (ii) above entered into with any
financial institution meeting the qualifications specified in clause (ii) above,
(iv) commercial paper having the highest rating obtainable from Moody's
Investors Service, Inc. or Standard & Poor's Ratings Group and in each case
maturing within six months after the date of acquisition and (v) money market
funds at least 95% of the assets of which constitute Cash Equivalents of the
kinds described in clauses (i) through (iv) of this definition.

     "Cedelbank" means Cedelbank, S.A. (or any successor securities clearing
agency).

     "Change of Control" means the occurrence of one or more of the following
events: (i) any sale, lease, exchange or other transfer (in one transaction or a
series of related transactions) of all or substantially all of the assets of the
Issuer and its Subsidiaries, taken as a whole, to any Person or group of related
Persons, as defined in Section 13(d) of the Exchange Act (a "Group"); (ii) the

                                      -4-
<PAGE>

approval by the holders of capital stock of the Issuer of any plan or proposal
for the liquidation or dissolution of the Issuer (whether or not otherwise in
compliance with the provisions of the applicable Indenture); (iii) any Person or
Group shall become the owner, directly or indirectly, beneficially or of record,
of shares representing more than 50% of the aggregate ordinary voting power
represented by the issued and outstanding Voting Stock of the Issuer or any
successor to all or substantially all of its assets; or (iv) during any period
of two consecutive years, individuals who at the beginning of such period
constituted the Board of Directors of the Issuer (together with any new
directors whose election to the Board of Directors or whose nomination for
election by the stockholders of the Issuer was approved by a vote of a majority
of the directors then still in office who were either directors at the beginning
of such period or whose election or nomination for election was previously so
approved) cease for any reason to constitute a majority of the Board of
Directors then in office.

     "Closing Date" means December 8, 1999.

     "Commission" means the Securities and Exchange Commission, as from time to
time constituted, created under the Exchange Act, or, if at any time after the
execution of this instrument such Commission is not existing and performing the
duties now assigned to it under the Trust Indenture Act, then the body
performing such duties at such time.

     "Common Stock" of any Person means Capital Stock of such Person that does
not rank prior, as to the payment of dividends or as to the distribution of
assets upon any voluntary or involuntary liquidation, dissolution or winding up
of such Person, to shares of Capital Stock of any other class of such Person.

     "Consolidated Debt to EBITDA Ratio" means the ratio of (a) the total
consolidated Debt as of the date of calculation (the "Determination Date") to
(b) four times the Consolidated EBITDA for the latest fiscal quarter for which
financial information is available immediately preceding such Determination Date
(the "Measurement Period").  For purposes of calculating Consolidated EBITDA for
the Measurement Period immediately prior to the relevant Determination Date, (i)
any Person that is a Restricted Subsidiary on the Determination Date (or would
become a Restricted Subsidiary on such Determination Date in connection with the
transaction that requires the determination of such Consolidated EBITDA) will be
deemed to have been a Restricted Subsidiary at all times during such Measurement
Period, (ii) any Person that is not a Restricted Subsidiary on such
Determination Date (or would cease to be a Restricted Subsidiary on such
Determination Date in connection with the transaction that requires the
determination of such Consolidated EBITDA) will be deemed not to have been a
Restricted Subsidiary at any time during such Measurement Period, and (iii) if
the Issuer or any Restricted Subsidiary shall have in any manner (x) acquired
(through an acquisition or the commencement of activities constituting such
operating business) or (y) disposed of (by an Asset Sale or the termination or
discontinuance of activities constituting such operating business) any operating
business during such Measurement Period or after the end of such period and on
or prior to such Determination Date, such calculation will be made on a pro
forma basis in accordance with GAAP as if, in the case of an acquisition or the
commencement of activities constituting such

                                      -5-
<PAGE>

operating business, all such transactions had been consummated prior to the
first day of such Measurement Period (it being understood that in calculating
Consolidated EBITDA the exclusions set forth in clauses (a) through (f) of the
definition of Consolidated Net Income shall apply to any Person acquired as if
it were a Restricted Subsidiary.

     "Consolidated EBITDA" means, with respect to any period, Consolidated Net
Income for such period increased (without duplication), to the extent deducted
in calculating such Consolidated Net Income, by (a) Consolidated Income Tax
Expense for such period; (b) Consolidated Interest Expense for such period
without regard to the proviso therein; and (c) depreciation, amortization and
any other non-cash items for such period, less any non-cash items to the extent
they increase Consolidated Net Income (including the partial or entire reversal
of reserves taken in prior periods) for such period, of the Issuer and any
Restricted Subsidiary, including, without limitation, amortization of
capitalized debt issuance costs for such period, all of the foregoing determined
on a consolidated basis for the Issuer and its Restricted Subsidiaries in
accordance with GAAP; provided that, if any Restricted Subsidiary is not a
Wholly Owned Restricted Subsidiary, Consolidated EBITDA shall be reduced (to the
extent not otherwise reduced in accordance with GAAP) by an amount equal to (A)
the amount of Consolidated EBITDA attributable to such Restricted Subsidiary
multiplied by (B) the percentage ownership interest in such Restricted
Subsidiary not owned on the last day of such period by the Issuer or any of its
Restricted Subsidiaries.

     "Consolidated Income Tax Expense" for any period means the consolidated
provision for income taxes of the Issuer and its Restricted Subsidiaries for
such period calculated on a consolidated basis in accordance with GAAP.

     "Consolidated Interest Expense" means for any period the consolidated
interest expense included in a consolidated income statement (without deduction
of interest income) of the Issuer and its Restricted Subsidiaries for such
period calculated on a consolidated basis in accordance with GAAP, including
without limitation or duplication (or, to the extent not so included, with the
addition of), (i) the amortization of Debt discounts; (ii) any payments or fees
with respect to letters of credit, bankers' acceptances or similar facilities;
(iii) fees (net of any amounts received) with respect to any Interest Rate or
Currency Protection Agreement; (iv) interest on Debt guaranteed by the Issuer
and its Restricted Subsidiaries, to the extent paid by the Issuer or any
Restricted Subsidiary; and (v) the portion of any Capital Lease Obligation
allocable to interest expense; provided that, if any Restricted Subsidiary is
not a Wholly Owned Restricted Subsidiary, Consolidated Interest Expense shall be
reduced (to the extent not otherwise reduced in accordance with GAAP) by an
amount equal to (A) the amount of Consolidated Interest Expense attributable to
such Restricted Subsidiary multiplied by (B) the percentage ownership interest
in such Restricted Subsidiary not owned on the last day of such period by the
Issuer or any of its Restricted Subsidiaries.

     "Consolidated Net Income" for any period means the consolidated net income
(or loss) of the Issuer and its Restricted Subsidiaries for such period
determined on a consolidated basis in accordance with GAAP; provided that there
shall be excluded therefrom (a) the net income (or loss)

                                      -6-
<PAGE>

of any Person acquired by the Issuer or a Restricted Subsidiary of the Issuer in
a pooling-of-interests transaction for any period prior to the date of such
transaction, (b) the net income (or loss) of any Person that is not a Restricted
Subsidiary of the Issuer except to the extent of the amount of dividends or
other distributions actually paid to the Issuer or a Restricted Subsidiary of
the Issuer by such Person during such period, (c) gains or losses on Asset Sales
by the Issuer or its Restricted Subsidiaries, (d) all extraordinary gains and
extraordinary losses, (e) the cumulative effect of changes in accounting
principles and (f) the tax effect of any of the items described in clauses (a)
through (e) above.

     "Consolidated Net Worth" of any Person means the consolidated stockholders'
equity of such Person, determined on a consolidated basis in accordance with
GAAP, less amounts attributable to Disqualified Stock of such Person; provided
that, with respect to the Issuer, adjustments following the date of this
Indenture to the accounting books and records of the Issuer in accordance with
Accounting Principles Board Opinions Nos. 16 and 17 (or successor opinions
thereto), or otherwise resulting from the acquisition of control of the Issuer
by another Person shall not be given effect.

     "Corporate Agency Office" means the principal office of the Euro Agent at
which at any particular time its corporate depositary business shall be
administered, which is, at the date as of which this Indenture is dated, located
at 9 Thomas More Street, London E19YT, United Kingdom.

     "Corporate Trust Office" means the principal office of the Trustee at which
at any particular time its corporate trust business shall be administered, which
is, at the date as of which this Indenture is dated, located at 101 California
Street, Suite 2725, San Francisco, CA 94111.

     "corporation" means a corporation, association, company, joint-stock
company, limited liability company, partnership or business trust.

     "Debt" means (without duplication), with respect to any Person, whether
recourse is to all or a portion of the assets of such Person and whether or not
contingent, (i) every obligation of such Person for money borrowed, (ii) every
obligation of such Person evidenced by bonds, debentures, notes or other similar
instruments, including obligations incurred in connection with the acquisition
of property, assets or businesses, (iii) every reimbursement obligation of such
Person with respect to letters of credit, bankers' acceptances or similar
facilities issued for the account of such Person (including reimbursement
obligations with respect thereto, but excluding obligations with respect to
trade letters of credit securing obligations entered into in the ordinary course
of business to the extent such letters of credit are not drawn upon or, if drawn
upon, to the extent such drawing is reimbursed no later than the third Business
Day following receipt by such Person of a demand for reimbursement), (iv) every
obligation of such Person issued or assumed as the deferred purchase price of
property or services (including securities repurchase agreements), (v) every
Capital Lease Obligation of such Person, (vi) all Disqualified Stock issued by
such Person, (vii) if such Person is a Restricted Subsidiary, all Preferred
Stock issued by such Person, (viii) every obligation under Interest Rate or
Currency Protection Agreements of such Person and (ix) every obligation of the
type referred to in clauses (I) through (ix) of another Person and all dividends
of another Person the

                                      -7-
<PAGE>

payment of which, in either case, such Person has Guaranteed or is responsible
or liable, directly or indirectly, as obligor, Guarantor or otherwise. The
"amount" or "principal amount" of Debt at any time of determination as used
herein represented by (a) any contingent Debt, shall be the maximum principal
amount thereof, (b) any Debt issued at a price that is less than the principal
amount at maturity thereof, shall be the amount of the liability in respect
thereof determined in accordance with GAAP, (c) any Disqualified Stock, shall be
the maximum fixed redemption or repurchase price in respect thereof, and (d) any
Preferred Stock, shall be the maximum voluntary or involuntary liquidation
preference plus accrued and unpaid dividends in respect thereof, in each case as
of such time of determination. In no event shall "Debt" include any trade
payable or accrued expenses arising in the ordinary course of business.

     "Default" has the meaning specified in Section 501.

     "Defaulted Interest" has the meaning specified in Section 308.

     "Depositary" means with respect to (i) the Dollar Securities, The
Depository Trust Company , (ii) the Regulation S Global Euro Securities,
Euroclear and Cedelbank, and (iii) the Restricted Global Euro Securities,
Euroclear, or, if any such entity shall cease to be a clearing agency registered
under the Exchange Act, any other clearing agency that is designated as the
successor Depositary in an Issuer Order delivered to the Trustee.

     "Disqualified Stock" of any Person means any Capital Stock of such Person
that by its terms (or by the terms of any security into which it is convertible,
or for which it is exchangeable, at the option of the holder thereof) or
otherwise matures or is required to be redeemed (pursuant to any sinking fund
obligation or otherwise, but other than as a result of the death or disability
of the holder thereof or the termination of the employment with the Issuer of
the holder thereof) or is convertible into or exchangeable for Debt or is
redeemable at the option of the holder thereof, in whole or in part, at any time
prior to the final maturity of the Securities; provided, however, that any
Capital Stock which would not constitute Disqualified Stock but for provisions
thereof giving holders thereof the right to require the Issuer or a Restricted
Subsidiary to repurchase or redeem such Capital Stock upon the occurrence of an
"asset sale" or a "change of control" occurring prior to the final maturity date
of the Securities shall not constitute Disqualified Stock if such provisions
applicable to such Capital Stock are no more favorable to the holders of such
stock than the corresponding provisions applicable to the Securities contained
in this Indenture and such provisions applicable to such Capital Stock
specifically provide that the Issuer and its Restricted Subsidiaries will not
repurchase or redeem any such stock pursuant to such provisions prior to the
repurchase of such Securities as are required to be repurchased pursuant to this
Indenture upon an Asset Sale or a Change of Control.

     "Distribution Compliance Period" means the period of 40 consecutive days
commencing on the later of (i) the date Securities are first offered to persons
other than distributors (as defined in Regulation S) in reliance on Regulation S
(the Issuer and Trustee being entitled to rely on written advice from the
Initial Purchasers with respect thereto) and (ii) the Closing Date.

                                      -8-
<PAGE>

     "Dollars" and "$" means such coins or currency of the United States of
America which is legal tender for payment of public and private debts.

     "DTC" means The Depository Trust Company, a New York corporation.

     "Euro" means such coins or currency of the European Monetary Union.

     "Euro Agent" means Chase Manhattan Bank London or such other Person
authorized to act as Euro Agent by the Issuer from time to time.

     "Euroclear" means the Euroclear Clearance System (or any successor
securities clearing agency).

     "Euro Paying Agent" means Chase Manhattan Bank London or such other Person
authorized to act as Euro Paying Agent by the Issuer from time to time.

     "Event of Default" has the meaning specified in Section 501.

     "Exchange Act" refers to the Securities Exchange Act of 1934 and any
successor act thereto.

     "Exchange and Registration Rights Agreement" means (i) the Exchange and
Registration Rights Agreement, dated as of December 1, 1999, between the Issuer
and the Initial Purchasers, as such agreement may be amended from time to time,
the form of which is attached hereto as Exhibit A, and (ii) any other agreement
entered into by the Issuer in the future that provides for an Exchange Offer or
resale registration with respect to any Additional Securities.

     "Exchange Offer" means an offer made by the Issuer pursuant to the Exchange
and Registration Rights Agreement or otherwise under an effective registration
statement under the Securities Act to Exchange Securities for Original
Securities or Additional Securities.

     "Exchange Offer Registration Statement" means a registration statement of
the Issuer under the Securities Act registering Exchange Securities for
distribution pursuant to an Exchange Offer.

     "Exchange Securities" means any Securities issued pursuant to an Exchange
Offer and their Successor Securities.

     "Existing Debt" shall mean Debt of the Issuer and its Restricted
Subsidiaries in existence on the Closing Date and the New Convertible Notes, if
any.

     "Expiration Date" has the meaning specified in Section 104.

                                      -9-
<PAGE>

     "GAAP" means generally accepted accounting principles in the United States
which are in effect on the date of original issuance of the Securities,
consistently applied.

     "Global Security" means either a Global Dollar Security or a Global Euro
Security.

     "Global Dollar Security" means a Dollar Security that is registered in the
Security Register in the name of a Depositary or a nominee thereof.

     "Global Euro Security" means a Euro Security that is registered in the
Security Register in the name of a Depositary or a nominee thereof.

     "Guarantee" by any Person means any obligation, contingent or otherwise, of
such Person guaranteeing, or having the economic effect of guaranteeing, any
Debt of any other Person (the "primary obligor") in any manner, whether directly
or indirectly, and including, without limitation, any obligation of such Person,
(i) to purchase or pay (or advance or supply funds for the purchase or payment
of) such Debt or to purchase (or to advance or supply funds for the purchase of)
any security for the payment of such Debt, (ii) to purchase property, securities
or services for the purpose of assuring the holder of such Debt of the payment
of such Debt, or (iii) to maintain working capital, equity capital or other
financial statement condition or liquidity of the primary obligor so as to
enable the primary obligor to pay such Debt (and "Guaranteed", "Guaranteeing"
and "Guarantor" shall have meanings correlative to the foregoing); provided,
however, that the Guaranty by any Person shall not include endorsements by such
Person for collection or deposit, in either case, in the ordinary course of
business.

     "Holder" means a Person in whose name a Security is registered in the
Security Register.

     "Incur" means, with respect to any Debt or other obligation of any Person,
to create, issue, incur (by conversion, exchange or otherwise), assume,
Guarantee or otherwise become liable in respect of such Debt or other obligation
including by acquisition of Restricted Subsidiaries or the recording, as
required pursuant to GAAP or otherwise, of any such Debt or other obligation on
the balance sheet of such Person (and "Incurrence", "Incurred", "Incurrable" and
"Incurring" shall have meanings correlative to the foregoing); provided,
however, that a change in GAAP that results in an obligation of such Person that
exists at such time becoming Debt shall not be deemed an Incurrence of such
Debt.

     "Indenture" means this instrument as originally executed or as it may from
time to time be supplemented or amended by one or more indentures supplemental
hereto entered into pursuant to the applicable provisions hereof.

     "Initial Purchasers" means Goldman, Sachs & Co., Donaldson, Lufkin &
Jenrette Securities Corporation, BancBoston Robertson Stephens Inc., PaineWebber
Incorporated and Morgan Stanley & Co. Incorporated as purchasers of the
Securities from the Issuer pursuant to the Purchase Agreement.

                                      -10-
<PAGE>

     "Interest Payment Date" means the Stated Maturity of an installment of
interest on the Securities.

     "Interest Rate or Currency Protection Agreement" of any Person means any
forward contract, futures contract, swap, option or other financial agreement or
arrangement (including, without limitation, caps, floors, collars and similar
agreements) relating to, or the value of which is dependent upon, interest rates
or currency exchange rates or indices.

     "Internal Revenue Code" means the Internal Revenue Code of 1986 and any
successor thereto.

     "Investment" by any Person means any direct or indirect loan, advance or
other extension of credit or capital contribution (by means of transfers of cash
or other property to others or payments for property or services for the account
or use of others, or otherwise) to, or purchase or acquisition of Capital Stock,
bonds, notes, debentures or other securities or evidence of Debt issued by, any
other Person, including any payment on a Guarantee of any obligation of such
other Person.

     "Issuer" means the Persons named as the "Issuer" in the first paragraph of
this instrument until a successor Person or Persons shall have become such
pursuant to the applicable provisions of this Indenture and thereafter "Issuer"
shall mean such successor Person.

     "Issuer Request" or "Issuer Order" means a written request or order signed
in the name of the Issuer by the Issuer's Chairman of the Board, its President
or a Vice President, and by its Treasurer, an Assistant Treasurer, its Secretary
or an Assistant Secretary, and delivered to the Trustee.

     "Lien" means, with respect to any property or assets, any mortgage or deed
of trust, pledge, hypothecation, assignment, deposit arrangement, security
interest, lien, charge, easement (other than any easement not materially
impairing usefulness or marketability), encumbrance, preference, priority or
other security agreement or preferential arrangement of any kind or nature
whatsoever on or with respect to such property or assets (including, without
limitation, any conditional sale or other title retention agreement having
substantially the same economic effect as any of the foregoing).

     "Liquidated Damages" has the meaning specified in the Exchange and
Registration Rights Agreement.

     "Material Restricted Subsidiary" means, at any date of determination, any
Restricted Subsidiary that represents more than 10% of the Issuer's total
consolidated assets at the end of the most recent fiscal quarter for which
financial information is available, or more than 10% of the Issuer's
consolidated net sales or consolidated operating income for the most recent four
quarters for which financial information is available.

                                      -11-
<PAGE>

     "Maturity", when used with respect to any Security, means the date on which
the principal of such Security becomes due and payable as therein or herein
provided, whether at the Stated Maturity or by declaration of acceleration, call
for redemption or otherwise.

     "Net Cash Proceeds" means (i) with respect to any Asset Sale by any Person,
cash or Cash Equivalents received (including by way of sale or discounting of a
note, installment receivable or other receivable, but excluding any other
consideration received in the form of assumption of Debt or other obligations
relating to such properties or assets) therefrom by such Person, net of (A) all
legal, title and recording tax expenses, commissions and other fees and expenses
Incurred and all federal, state, foreign and local taxes required to be accrued
as a liability as a consequence of such Asset Sale, (B) all payments made by
such Person or its Restricted Subsidiaries on any Debt which is secured by such
assets in accordance with the terms of any Lien upon or with respect to such
assets or which must by the terms of such Lien, or in order to obtain a
necessary consent to such Asset Sale or by applicable law, be repaid out of the
proceeds from such Asset Sale, (C) all distributions and other payments made to
minority interest holders in Restricted Subsidiaries of such Person or joint
ventures as a result of such Asset Sale and (D) appropriate amounts to be
provided by such Person or any Restricted Subsidiary thereof, as the case may
be, as a reserve in accordance with GAAP against any liabilities associated with
such assets and retained by such Person or any Restricted Subsidiary thereof, as
the case may be, after such Asset Sale, including, without limitation,
liabilities under any indemnification obligations and severance and other
employee termination costs associated with such Asset Sale, in each case as
determined by the Board of Directors, in its reasonable good faith judgment
evidenced by a resolution of the Board of Directors filed with the Trustee;
provided, however, that any reduction in such reserve within twelve months
following the consummation of such Asset Sale will be treated for all purposes
of this Indenture and the Securities as a new Asset Sale at the time of such
reduction with Net Cash Proceeds equal to the amount of such reduction, (ii)
with respect to the issuance or sale of Capital Stock, or options, warrants or
rights to purchase Capital Stock, or debt securities or Disqualified Stock that
has been converted into or exchanged for Capital Stock, the proceeds of such
issuance or sale in the form of cash or Cash Equivalents, including payments in
respect of deferred payment obligations, net of attorney's fees, accountant's
fees and brokerage, consultation, underwriting and other fees and expenses
actually incurred in connection with such issuance or sale, conversion or
exchange and net of any Consolidated Interest Expense attributable to any debt
securities paid to the holders thereof prior to the conversion or exchange and
net of taxes paid or payable as a result thereof.

     "New Convertible Notes" shall mean the Issuer's 4 3/4% Convertible
Subordinated Notes due July 15, 2008 not to exceed $500.0 million in aggregate
principal amount.

     "Noon Buying Rate" shall mean the noon buying rate in the City of New York
for cable transfers in Euros as certified for customs purposes by the Federal
Reserve Bank of New York.

     "Notice of Default" has the meaning specified in Section 602.

     "Offer" has the meaning specified in the definition of Offer to Purchase.

                                      -12-
<PAGE>

     "Offer Expiration Date" has the meaning specified in the definition of
Offer to Purchase.

     "Offer to Purchase" means a written offer (the "Offer") sent by the Issuer
by first class mail, postage prepaid, to each Holder at his address appearing in
the Securities Register on the date of the Offer offering to purchase up to the
principal amount of Securities specified in such Offer at the purchase price
specified in such Offer (as determined pursuant to this Indenture).  The Issuer
shall also issue a Press Release including all relevant information relating to
such Offer.  Unless otherwise required by applicable law, the Offer shall
specify an expiration date (the "Offer Expiration Date") of the Offer to
Purchase which shall be, subject to any contrary requirements of applicable law,
not less than 30 days or more than 60 days after the date of such Offer and a
settlement date (the "Purchase Date") for purchase of Securities within five
Business Days after the Offer Expiration Date.  The Issuer shall notify the
Trustee at least 15 Business Days (or such shorter period as is acceptable to
the Trustee) prior to the mailing of the Offer of the Issuer's obligation to
make an Offer to Purchase, and the Offer shall be mailed by the Issuer or, at
the Issuer's request, by the Trustee in the name and at the expense of the
Issuer.  The Offer shall contain information concerning the business of the
Issuer and its Restricted Subsidiaries which the Issuer in good faith believes
will enable such Holders to make an informed decision with respect to the Offer
to Purchase (which at a minimum will include (i) the most recent annual and
quarterly financial statements and "Management's Discussion and Analysis of
Financial Condition and Results of Operations" contained in the documents
required to be filed with the Trustee pursuant to this Indenture (which
requirements may be satisfied by delivery of such documents together with the
Offer), (ii) a description of material developments in the Issuer's business
subsequent to the date of the latest of such financial statements referred to in
clause (i) (including a description of the events requiring the Issuer to make
the Offer to Purchase), (iii) if applicable, appropriate pro forma financial
information concerning the Offer to Purchase and the events requiring the Issuer
to make the Offer to Purchase and (iv) any other information required by
applicable law to be included therein.  The Offer shall contain all instructions
and materials necessary to enable such Holders to tender Securities pursuant to
the Offer to Purchase.  The Offer shall also state:

     (1)  the Section of this Indenture pursuant to which the Offer to Purchase
is being made;

     (2)  the Offer Expiration Date and the Purchase Date;

     (3)  the aggregate principal amount of the Outstanding Securities offered
to be purchased by the Issuer pursuant to the Offer to Purchase (including, if
less than 100%, the manner by which such has been determined pursuant to the
Section hereof requiring the Offer to Purchase) (the "Purchase Amount");

     (4)  the purchase price to be paid by the Issuer for each $1,000, or Euro
1,000, aggregate principal amount of Dollar Securities or Euro Securities, as
the case may be, accepted for payment (as specified pursuant to the Indenture)
(the "Purchase Price");

                                      -13-
<PAGE>

     (5) that the Holder may tender all or any portion of the Securities
registered in the name of such Holder and that any portion of a Security
tendered must be tendered in an integral of $1,000, or Euro 1,000, principal
amount, as applicable;

     (6) the place or places where Securities are to be surrendered for tender
pursuant to the Offer to Purchase;

     (7) that interest on any Securities not tendered or tendered but not
purchased by the Issuer pursuant to the Offer to Purchase will continue to
accrue;

     (8) that on the Purchase Date the Purchase Price will become due and
payable upon each Security being accepted for payment pursuant to the Offer to
Purchase and that interest thereon shall cease to accrue on and after the
Purchase Date;

     (9) that each Holder electing to tender a Security pursuant to the Offer to
Purchase will be required to surrender such Security at the place or places
specified in the Offer prior to the close of business on the Offer Expiration
Date (such Security being, if the Issuer or the Trustee so requires, duly
endorsed by, or accompanied by a written instrument of transfer in form
satisfactory to the Issuer and the Trustee duly executed by, the Holder thereof
or his attorney duly authorized in writing);

     (10) that Holders will be entitled to withdraw all or any portion of
Securities tendered if the Issuer (or their Paying Agent) receives, not later
than the close of business on the Offer Expiration Date, a telegram, telex,
facsimile transmission or letter setting forth the name of the Holder, the
principal amount of the Security the Holder tendered, the certificate number of
the Security the Holder tendered and a statement that such Holder is withdrawing
all or a portion of his tender;

     (11) that (a) if Securities in an aggregate principal amount less than or
equal to the Purchase Amount are duly tendered and not withdrawn pursuant to the
Offer to Purchase, the Issuer shall purchase all such Securities and (b) if
Securities in an aggregate principal amount in excess of the Purchase Amount are
tendered and not withdrawn pursuant to the Offer to Purchase, the Issuer shall
purchase Securities having an aggregate principal amount equal to the Purchase
Amount on a pro rata basis (with such adjustments as may be deemed appropriate
so that only Securities in denominations of $1,000 or Euro 1,000, as the case
may be, or integral multiples thereof shall be purchased); and

     (12) that in the case of any Holder whose Security is purchased only in
part, the Issuer shall execute, and the Trustee or Authentication Agent shall
authenticate and deliver to the Holder of such Security without service charge,
a new Security or Securities, of any authorized denomination as requested by
such Holder, in an aggregate principal amount equal to and in exchange for the
unpurchased portion of the Security so tendered.

                                      -14-
<PAGE>

     Any Offer to Purchase shall be governed by and effected in accordance with
the Offer for such Offer to Purchase.

     "Officers' Certificate" means a certificate signed by the Chairman of the
Board, Chief Executive Officer, Chief Financial Officer, the President or a Vice
President, and by the Treasurer, an Assistant Treasurer, the Secretary or an
Assistant Secretary, of the Issuer and delivered to the Trustee.

     "Opinion of Counsel" means a written opinion of counsel, who may be counsel
for the Issuer, and who shall be acceptable to the Trustee.

     "Original Securities" means the Securities issued on the Closing Date and
their Successor Securities.

     "Outstanding", when used with respect to Securities, means, as of the date
of determination, all Securities theretofore authenticated and delivered under
this Indenture, except:

          (1) Securities theretofore canceled by the Trustee or Authentication
     Agent or delivered to the Trustee or Authentication Agent for cancellation;

          (2) Securities for whose payment or redemption money in the necessary
     amount has been theretofore deposited with the Trustee or any Paying Agent
     (other than the Issuer) in trust or set aside and segregated in trust by
     the Issuer (if the Issuer shall act as its own Paying Agent) for the
     Holders of such Securities; provided that, if such Securities are to be
     redeemed, notice of such redemption has been duly given pursuant to this
     Indenture or provision therefor satisfactory to the Trustee has been made;
     and

          (3) Securities which have been paid pursuant to Section 307 or in
     exchange for or in lieu of which other Securities have been authenticated
     and delivered pursuant to this Indenture, other than any such Securities in
     respect of which there shall have been presented to the Trustee proof
     satisfactory to it that such Securities are held by a bona fide purchaser
     in whose hands such Securities are valid obligations of the Issuer;

          provided, however, that in determining whether the Holders of the
requisite principal   amount of the Outstanding Securities have given any
request, demand, authorization, direction, notice, consent or waiver hereunder,
Securities owned by the Issuer or any other obligor upon the Securities or any
Affiliate of the Issuer or of such other obligor shall be disregarded and deemed
not to be Outstanding, except that, in determining whether the Trustee shall be
protected in relying upon any such request, demand, authorization, direction,
notice, consent or waiver, only Securities which the Trustee knows to be so
owned shall be so disregarded.  Securities so owned which have been pledged in
good faith may be regarded as Outstanding if the pledgee establishes to the
satisfaction of the Trustee the pledgee's right so to act with respect to such
Securities and that the

                                      -15-
<PAGE>

pledgee is not the Issuer or any other obligor upon the Securities or any
Affiliate of the Issuer or of such other obligor.

     "pari passu", when used with respect to the ranking of any Debt of any
Person in relation to other Debt of such Person, means that each such Debt (a)
either (i) is not subordinated in right of payment to any other Debt of such
Person or (ii) is subordinate in right of payment to the same Debt of such
Person as is the other and is so subordinate to the same extent and (b) is not
subordinate in right of payment to the other or to any Debt of such Person as to
which the other is not so subordinate.

     "Paying Agent" means any Person authorized by the Issuer to pay the
principal of (and premium, if any) or interest on any Securities on behalf of
the Issuer.

     "Permitted Interest Rate or Currency Protection Agreement" of any Person
means any Interest Rate or Currency Protection Agreement entered into with one
or more financial institutions that is designed to protect such Person against
fluctuations in interest rates or currency exchange rates with respect to Debt
Incurred and which shall have a notional amount no greater than the payments due
with respect to the Debt being hedged thereby and not for purposes of
speculation.

     "Permitted Investment" means (i) an Investment in the Issuer or a Wholly
Owned Restricted Subsidiary or a Person which will, upon the making of such
Investment, become a Wholly Owned Restricted Subsidiary or be merged or
consolidated with or into or transfer or convey all or substantially all its
assets to, the Issuer or a Wholly Owned Restricted Subsidiary; provided that
such Person's primary business or the assets to be transferred or conveyed are
related, ancillary or complementary to the System and Network Management
Business; (ii) Cash Equivalents; (iii) payroll, travel, relocation and similar
advances to cover matters that are expected at the time of such advances
ultimately to be treated as expenses in accordance with GAAP; (iv) stock,
obligations or securities received (x) in satisfaction of judgments or (y) in
connection with the sale or disposition of a Person, assets or business; (v)
Investments in prepaid expenses, negotiable instruments held for collection and
lease, utility and worker's compensation, performance and other similar
deposits; (vi) Permitted Interest Rate or Currency Agreements; (vii) Strategic
Investments; (viii) loans or advances to officers or employees of the Issuer or
any Restricted Subsidiary (other than loans or advances made pursuant to clause
(ix) below) that do not in the aggregate exceed $10.0 million at any time
outstanding; (ix) accounts receivable in the ordinary course of business (and
Investments obtained in exchange or settlement of accounts receivable for which
the Issuer has determined that collection is not likely); and (x) loans or
advances to Persons who own Debt or Capital Stock (other than any Affiliate of
the Issuer or any Restricted Subsidiary) of any Person if such loans or advances
are made as part of, or in connection with, a transaction pursuant to which such
Person becomes a Restricted Subsidiary of the Issuer or any other Restricted
Subsidiary or substantially all of the assets of such Person are acquired by the
Issuer or any Restricted Subsidiary, in an aggregate amount not to exceed 20% of
the total consideration paid in connection with such acquisition.

                                      -16-
<PAGE>

     "Permitted Lien" means any Lien on the assets of the Issuer or any
Restricted Subsidiary permitted under Section 1013.

     "Permitted Senior Bank Debt" means Debt Incurred by Issuer or any
Restricted Subsidiary pursuant to one or more senior commercial term loan and/or
revolving credit facilities (including any letter of credit subfacility) entered
into principally with commercial banks and/or other financial institutions
typically party to commercial loan agreements, and any replacement, extension,
renewal, refinancing or refunding thereof; provided that the aggregate principal
amount of all Permitted Senior Bank Debt, at any one time outstanding, shall not
exceed $150.0 million plus 85% of the Issuer's consolidated net accounts
receivable.

     "Person" means any individual, corporation, partnership, joint venture,
trust, unincorporated organization or government or any agency or political
subdivision thereof.

     "Predecessor Security" of any particular Security means every previous
Security evidencing all or a portion of the same debt as that evidenced by such
particular Security; and, for the purposes of this definition, any Security
authenticated and delivered under Section 307 in exchange for or in lieu of a
mutilated, destroyed, lost or stolen Security shall be deemed to evidence the
same debt as the mutilated, destroyed, lost or stolen Security.

     "Preferred Stock" of any Person means Capital Stock of such Person of any
class or classes (however designated) that ranks prior, as to the payment of
dividends or as to the distribution of assets upon any voluntary or involuntary
liquidation, dissolution or winding up of such Person, to shares of Capital
Stock of any other class of such Person.

     "Press Release" shall mean any press release issued by the Issuer and
disseminated through Dow Jones & Company, Inc., Reuters Business News Services,
Bloomberg Business News or other national business news service commonly used by
U.S. businesses in the same line of business as the Company for disseminating
information regarding corporate events.

     "Public Equity Offering" means an underwritten primary public offering of
Common Stock of the Issuer pursuant to an effective registration statement under
the Securities Act.

     "Purchase Agreement" means the Purchase Agreement, dated December 2, 1999,
between the Issuer and the Initial Purchasers, as such agreement may be amended
from time to time.

     "Purchase Amount" has the meaning specified in the definition of Offer to
Purchase.

     "Purchase Date" has the meaning specified in the definition of Offer to
Purchase.

     "Purchase Money Secured Debt" of any Person means Debt of such Person
secured by a Lien on real or personal property of such Person which Debt (a)
constitutes all or a part of the purchase price or construction cost of such
property or (b) is Incurred prior to, at the time of or within 180

                                      -17-
<PAGE>

days after the acquisition or substantial completion of such property for the
purpose of financing all or any part of the purchase price or construction cost
thereof; provided, however, that (w) the Debt so incurred does not exceed 100%
of the purchase price or construction cost of such property and related
expenses, (x) such Lien does not extend to or cover any property other than such
item of property and any improvements on such item and proceeds thereof, (y) the
purchase price or construction cost for such property is or should be included
in "addition to property, plant and equipment" in accordance with GAAP, and (z)
the purchase or construction of such property is not part of any acquisition of
a Person or business unit or line of business.

     "Purchase Price" has the meaning specified in the definition of Offer to
Purchase.

     "Qualified Consideration" shall mean: (i) cash; (ii) Cash Equivalents;
(iii) assets that are used or useful in the System and Network Management
Business; (iv) any securities or other obligations that are converted into or
exchanged for cash or Cash Equivalents within six months after the Asset Sale or
(v) liabilities of the Issuer or a Restricted Subsidiary assumed by the
transferee (or its designee) such that the Issuer or such Restricted Subsidiary
has no further liability therefor, the amount of the liability to be determined
in accordance with GAAP.

     "Receivables" means receivables, chattel paper, instruments, documents or
intangibles evidencing or relating to the right to payment of money.

     "Redemption Date", when used with respect to any Security to be redeemed,
means the date fixed for such redemption by or pursuant to this Indenture.

     "Redemption Price", when used with respect to any Security to be redeemed,
means the price at which it is to be redeemed pursuant to this Indenture.

     "Registered Securities" means the Exchange Securities and all other
Securities sold or otherwise disposed of pursuant to an effective registration
statement under the Securities Act, together with its respective Successor
Securities.

     "Regular Record Date" for the interest payable on any Interest Payment Date
means the June 1 or December 1 (whether or not a Business Day), as the case may
be, next preceding such Interest Payment Date.

     "Regulation S" means Regulation S under the Securities Act.

     "Regulation S Certificate" means a certificate substantially in the form
set forth in Annex A.

     "Regulation S Global Dollar Security" has the meaning specified in Section
201.

     "Regulation S Global Euro Security" has the meaning specified in Section
201.

                                      -18-
<PAGE>

     "Regulation S Global Security" means either a Regulation S Global Dollar
Security or a Regulation S Global Euro Security.

     "Regulation S Legend" means a legend substantially in the form of the
legend required in the form of Security set forth in Section 202 to be placed
upon Regulation S Securities.

     "Regulation S Securities " means all Securities required pursuant to
Section 306(c) to bear a Regulation S Legend.

     "Related Person" of any Person means any other Person directly or
indirectly owning (a) 5% or more of the outstanding Common Stock of such Person
(or, in the case of a Person that is not a corporation, 5% or more of the equity
interest in such Person) or (b) 5% or more of the combined voting power of the
Voting Stock of such Person.

     "Required Filing Date" has the meaning specified in Section 1019.

     "Resale Registration Statement" means a shelf registration statement under
the Securities Act filed by the Issuer, if required by, and meeting the
requirements of, the Exchange and Registration Rights Agreement, registering
Original Securities or Additional Securities for resale.

     "Responsible Officer", when used with respect to the Trustee, means any
vice president, any assistant vice president, any assistant secretary, any
assistant treasurer, any trust officer or assistant trust officer, the
controller or any assistant controller or any other officer of the Trustee
customarily performing functions similar to those performed by any of the above
designated officers and also means, with respect to a particular corporate trust
matter, any other officer to whom such matter is referred because of his
knowledge of and familiarity with the particular subject.

     "Restricted Global Dollar Security" has the meaning set forth in Section
201.

     "Restricted Global Euro Security" has the meaning set forth in Section 201.

     "Restricted Global Security" means either a Restricted Global Dollar
Security or a Restricted Global Euro Security.

     "Restricted Payments" has the meaning specified in Section 1011.

  "Restricted Securities" means all Securities required pursuant to Section
306(c) to bear a Restricted Securities Legend.  Such term includes the
Restricted Global Securities.

     "Restricted Securities Certificate" means a certificate substantially in
the form set forth in Annex B.

                                      -19-
<PAGE>

     "Restricted Securities Legend" means a legend substantially in the form of
the legend required in the form of Security set forth in Section 202 to be
placed upon a Restricted Security.

     "Restricted Subsidiary" means any Subsidiary of the Issuer, whether
existing on or after the date of this Indenture, unless such Subsidiary is an
Unrestricted Subsidiary.

     "Rule 144" means Rule 144 under the Securities Act.

     "Rule 144A" means Rule 144A under the Securities Act.

     "Rule 144A Securities" means either Rule 144A Dollar Securities or Rule
144A Euro Securities.

     "Rule 144A Dollar Securities" means (i) in the case of the Original
Securities, the Dollar Securities purchased by the Initial Purchasers from the
Issuer pursuant to the Purchase Agreement, other than the Regulation S Dollar
Securities, and (ii) in the case of Additional Securities, any Additional
Securities purchased from the Issuer for resale pursuant to Rule 144A.

     "Rule 144A Euro Securities" means the Euro Securities purchased by the
Initial Purchasers from the Issuer pursuant to the Purchase Agreement, other
than the Regulation S Euro Securities.

     "Secured Debt" means Permitted Senior Bank Debt, Purchase Money Secured
Debt and other Debt secured by a Permitted Lien.

     "Securities" has the meaning specified in the first paragraph of the
recitals to this instrument and includes the Exchange Securities and Additional
Securities.

     "Securities Act" means the Securities Act of 1933, and any successor act
thereto.

     "Securities Act Legend" means a Restricted Securities Legend or a
Regulation S Legend.

     "Security Register" and "Security Registrar" have the respective meanings
specified in Section 306.

     "Senior Loan Facility" means the loan facility expected to be provided
pursuant to a credit agreement to be entered into by and among the Issuer,
Goldman Sachs Credit Partners L. P., as arranger and syndication agent, certain
lenders from time to time party thereto, and the administrative agent party
thereto, and any credit agreements governing Debt Incurred to refund, replace or
refinance borrowings or commitments then outstanding under or permitted to be
Incurred or outstanding under such facility, and all promissory notes,
guaranties, letters of credit, security agreements, pledge agreements,
mortgages, deeds of trust and other instruments, documents or agreements
executed pursuant to such credit agreements, in each case as the same may be
amended, extended, renewed, supplemented, restated or otherwise modified from
time to time.

                                      -20-
<PAGE>

     "Special Record Date" for the payment of any Defaulted Interest means a
date fixed by the Trustee pursuant to Section 308.

     "Stated Maturity", when used with respect to any Security or any
installment of interest thereon, means the date specified in such Security as
the fixed date on which the principal of such Security or such installment of
interest is due and payable.

     "Strategic Investment" means an Investment in any Person (other than an
Unrestricted Subsidiary of the Issuer) whose primary business is related,
ancillary or complementary to the System and Network Management Business, and
such Investment is determined by the Board of Directors of the Issuer to promote
or significantly benefit the businesses of the Issuer and its Restricted
Subsidiaries on the date of such Investment.

     "Subordinated Debt" means Debt of the Issuer as to which the payment of
principal of (and premium, if any) and interest and other payment obligations in
respect of such Debt shall be subordinate to the prior payment in full of the
Securities to at least the following extent: (i) no payments of principal of (or
premium, if any) or interest on, or otherwise due in respect of such Debt, may
be permitted for so long as any default in the payment of principal (or premium,
if any) or interest on the Securities exists; (ii) in the event that any other
default that with the passing of time or the giving of notice, or both, would
constitute an Event of Default with respect to the Securities, upon notice by
25% or more in principal amount of the Securities to the Trustee, the Trustee
shall have the right to give notice to the Issuer and the holders of such Debt
(or trustees or agents therefor) of a payment blockage, and thereafter no
payments of principal of (or premium, if any) or interest on or otherwise due in
respect of such Debt may be made for a period of 179 days from the date of such
notice; and (iii) such Debt may not (x) provide for payments of principal of
such Debt at the Maturity thereof or by way of a sinking fund applicable thereto
or by way of any mandatory redemption, defeasance, retirement or repurchase
thereof by the Issuer (including any redemption, retirement or repurchase which
is contingent upon events or circumstances, but excluding any retirement
required by virtue of acceleration of such Debt upon an event of default
thereunder), in each case prior to the final maturity date of the Securities or
(y) permit redemption or other retirement (including pursuant to an offer to
purchase made by the Issuer) of such other Debt at the option of the holder
thereof prior to the final maturity date of the Securities, other than a
redemption or other retirement at the option of the holder of such Debt
(including pursuant to an offer to purchase made by the Issuer) which is
conditioned upon a change of control of the Issuer pursuant to provisions
substantially similar to Section 1016 (and which shall provide that such Debt
will not be repurchased pursuant to such provisions prior to the Issuer's
repurchase of the Securities required to be repurchased by the Issuer pursuant
to Section 1016); provided, however, that any Debt which would constitute
Subordinated Debt but for provisions thereof giving holders thereof the right to
require the Issuer or a Restricted Subsidiary to repurchase or redeem such
Subordinated Debt upon the occurrence of an asset sale occurring prior to the
final maturity of the Securities shall constitute Subordinated Debt if such
provisions applicable to such Subordinated Debt are nor more favorable to the
holders of such Debt than the provisions applicable to the Securities contained
in Section 1015 and such provisions applicable to such Debt specifically provide
that the Issuer and its Restricted Subsidiaries will not repurchase or redeem
any such Debt pursuant to such provisions prior to the repurchase of such
Securities as are required to be repurchased pursuant to Section 1015

                                      -21-
<PAGE>

and such provisions applicable to such Debt specifically provide that the Issuer
and its Restricted Subsidiaries will not repurchase or redeem any such Debt
pursuant to such provisions prior to the repurchase of such Securities as are
required to be repurchased pursuant to Section 1015.

     "Subsidiary" of any Person means (i) a corporation more than 50% of the
combined voting power of the outstanding Voting Stock of which is owned,
directly or indirectly, by such Person or by one or more other Subsidiaries of
such Person or by such Person and one or more Restricted Subsidiaries thereof,
or (ii) any other Person (other than a corporation) in which such Person, or one
or more other Subsidiaries of such Person or such Person and one or more other
Subsidiaries thereof, directly or indirectly, has at least a majority ownership
and power to direct the policies, management and affairs thereof.

     "Successor Security" of any particular Security means every Security issued
after, and evidencing all or a portion of the same debt as that evidenced by,
such particular Security; and, for the purpose of this definition, any Security
authenticated and delivered under Section 307 in exchange for or in lieu of a
mutilated, destroyed, lost or stolen Security shall be deemed to evidence the
same debt as the mutilated, destroyed, lost or stolen Security.

     "System and Network Management Business" means (i) server and other
hardware hosting, (ii) connectivity, data networking, telecommunications or
content for computer or data networks or systems; (iii) management of computer
or data networks or systems; (iv) technology services, equipment sales or
leasing or software licensing for computer or data networks or systems
(including Internet Protocol and any successor protocol(s) based networks); and
(v) businesses reasonably related, complementary or incidental thereto.

     "Trust Indenture Act" means the Trust Indenture Act of 1939 as in force at
the date as of which this instrument was executed, except as provided in Section
905; provided, however, that in the event the Trust Indenture Act of 1939 is
amended after such date, "Trust Indenture Act" means, to the extent required by
any such amendment, the Trust Indenture Act of 1939 as so amended.

     "Trustee" means the Person named as the "Trustee" in the first paragraph of
this instrument until a successor Trustee shall have become such pursuant to the
applicable provisions of this Indenture, and thereafter "Trustee" shall mean
such successor Trustee.

     "Unregistered Security" means any Security that is not a Registered
Security.

     "Unrestricted Securities Certificate" means a certificate substantially in
the form set forth in Annex C.

     "Unrestricted Subsidiary" has the meaning set forth in Section 1018.

     "U.S. Dollar Equivalent" means, with respect to any monetary amount in a
currency other than the Dollar, at or as of any time for the determination
thereof, the amount of Dollars obtained by

                                      -22-
<PAGE>

converting such foreign currency involved in such computation into Dollars at
the most recently announced Noon Buying Rate.

     "U.S. Government Securities" means securities that are direct obligations
of the United States of America, direct obligations of the Federal Home Loan
Mortgage Corporation, direct obligations of the Federal National Mortgage
Association, securities which the timely payment of whose principal and interest
is unconditionally guaranteed by the full faith and credit of the United States
of America, trust receipts or other evidence of a direct claim upon the
instruments described above and money market mutual funds that invest solely in
such securities.

     "U.S. Person" means (i) any natural person resident in the United States,
(ii) any partnership or corporation organized or incorporated under the laws of
the United States, (iii) any estate of which an executor or administrator is a
U.S. Person (other than an estate governed by foreign law and of which at least
one executor or administrator is a non-U.S. Person who has sole or shared
investment discretion with respect to its assets), (iv) any trust of which any
trustee is a U.S. Person (other than a trust of which at least one trustee is a
non-U.S. Person who has sole or shared investment discretion with respect to its
assets and no beneficiary of the trust (and no settlor if the trust is
revocable) is a U.S. Person), (v) any agency or branch of a foreign entity
located in the United States, (vi) any non-discretionary or similar account
(other than an estate or trust) held by a dealer or other fiduciary for the
benefit or account of a U.S. Person, (vii) any discretionary or similar account
(other than an estate or trust) held by a dealer or other fiduciary organized,
incorporated or (if an individual) resident in the United States (other than
such an account held for the benefit or account of a non-U.S. Person) and (viii)
any partnership or corporation organized or incorporated under the laws of a
foreign jurisdiction and formed by a U.S. Person principally for the purpose of
investing in securities not registered under the Securities Act (unless it is
organized or incorporated, and owned, by accredited investors within the meaning
of Rule 501(a) under the Securities Act who are not natural persons, estates or
trusts); provided, however, that the term a "U.S. Person" does not include (A) a
branch or agency of a U.S. Person that is located and operating outside the
United States for valid business purposes as a locally regulated branch or
agency engaged in the banking or insurance business, (B) any employee benefit
plan established and administered in accordance with the law, customary
practices and documentation of a foreign country and (C) the international
organizations set forth in Section 902(k)(2) of Regulation S under the
Securities Act and any other similar international organizations, and its
agencies, affiliates and pension plans.

     "Vice President", when used with respect to the Issuer, means any vice
president, whether or not designated by a number or a word or words added before
or after the title "vice president".

     "Voting Stock" of any Person means Capital Stock of such Person which
ordinarily has voting power for the election of directors (or persons performing
similar functions) at such Person, whether at all times or only so long as no
senior class of securities has such voting power by reason of any contingency.

                                      -23-
<PAGE>

     "Wholly Owned Restricted Subsidiary" of any Person means a Restricted
Subsidiary of such person all of the outstanding Capital Stock or other
ownership interests of which (other than directors' qualifying shares) shall at
the time be owned by such Person or by one or more Wholly Owned Restricted
Subsidiaries of such Person or by such Person and one or more Wholly Owned
Restricted Subsidiaries of such Person.

     SECTION 102.  Compliance Certificates and Opinions.  Upon any application
                   ------------------------------------
or request by the Issuer to the Trustee to take any action under any provision
of this Indenture, the Issuer shall furnish to the Trustee such certificates and
opinions as may be required under the Trust Indenture Act.  Each such
certificate or opinion shall be given in the form of an Officers' Certificate,
if to be given by an officer of the Issuer, or an Opinion of Counsel, if to be
given by counsel, and shall comply with the requirements of the Trust Indenture
Act and any other requirement set forth in this Indenture.

     Every certificate or opinion with respect to compliance with a condition or
covenant provided for in this Indenture shall include (in form reasonably
satisfactory to the Trustee)

          (1) a statement that each individual signing such certificate or
     opinion has read such covenant or condition and the definitions herein
     relating thereto;

          (2) a brief statement as to the nature and scope of the examination or
     investigation upon which the statements or opinions contained in such
     certificate or opinion are based;

          (3) a statement that, in the opinion of each such individual, he has
     made such examination or investigation as is necessary to enable him to
     express an informed opinion as to whether or not such covenant or condition
     has been complied with (which, in the case of an Opinion of Counsel and if
     permitted under the Trust Indenture Act, may be limited to reliance on an
     Officers' Certificate as to matters of fact); and

          (4) a statement as to whether, in the opinion of each such individual,
     such condition or covenant has been complied with.

     SECTION 103.  Form of Documents Delivered to Trustee.  In any case where
                   --------------------------------------
several matters are required to be certified by, or covered by an opinion of,
any specified Person, it is not necessary that all such matters be certified by,
or covered by the opinion of, only one such Person, or that they be so certified
or covered by only one document, but one such Person may certify or give an
opinion with respect to some matters and one or more other such eligible and
qualified Persons as to other matters, and any such Person may certify or give
an opinion as to such matters in one or several documents.

     Any certificate or opinion of an officer of the Issuer may be based,
insofar as it relates to legal matters, upon a certificate or opinion of, or
representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to the matters upon which his certificate or opinion is based are

                                      -24-
<PAGE>

erroneous.  Any such certificate or opinion of counsel may be based, insofar as
it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Issuer stating the information
on which counsel is relying unless such counsel knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to such matters are erroneous.

     Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.

     SECTION 104.  Acts of Holders; Record Date.  Any request, demand,
                   ----------------------------
authorization, direction, notice, consent, waiver or other action provided by
this Indenture to be given or taken by Holders may be embodied in and evidenced
by one or more instruments of substantially similar tenor signed by such Holders
in person or by an agent duly appointed in writing; and, except as herein
otherwise expressly provided, such action shall become effective when such
instrument or instruments are delivered to the Trustee in accordance with
Section 105 hereof, and, where it is hereby expressly required, to the Issuer.
Such instrument or instruments (and the action embodied therein and evidenced
thereby) are herein sometimes referred to as the "Act" of the Holders signing
such instrument or instruments.  Proof of execution of any such instrument or of
a writing appointing any such agent shall be sufficient for any purpose of this
Indenture and (subject to Section 601) conclusive in favor of the Trustee and
the Issuer, if made in the manner provided in this Section.

     The fact and date of the execution by any Person of any such instrument or
writing may be proved by the affidavit of a witness of such execution or by a
certificate of a notary public or other officer authorized by law to take
acknowledgments of deeds, certifying that the individual signing such instrument
or writing acknowledged to him the execution thereof. Where such execution is by
a signer acting in a capacity other than his individual capacity, such
certificate or affidavit shall also constitute sufficient proof of his
authority. The fact and date of the execution of any such instrument or writing,
or the authority of the Person executing the same, may also be proved in any
other manner which the Trustee deems sufficient.

     The ownership of Securities shall be proved by the Security Register.  Any
request, demand, authorization, direction, notice, consent, waiver or other Act
of the Holder of any Security shall bind every future Holder of the same
Security and the Holder of every Security issued upon the registration of
transfer thereof or in exchange therefor or in lieu thereof in respect of
anything done, omitted or suffered to be done by the Trustee or the Issuer in
reliance thereon, whether or not notation of such action is made upon such
Security.

     The Issuer may set any day as a record date for the purpose of determining
the Holders of Outstanding Securities entitled to give, make or take any
request, demand, authorization, direction, notice, consent, waiver or other
action provided or permitted by this Indenture to be given, made or taken by
Holders of Securities, provided that the Issuer may not set a record date for,
and the provisions of this paragraph shall not apply with respect to, the giving
or making of any notice,

                                      -25-
<PAGE>

declaration, request or direction referred to in the next paragraph. If not set
by the Issuer prior to the first solicitation of a Holder made by any Person in
respect of any such matter referred to in the foregoing sentence, the record
date for any such matter shall be the 30th day (or, if later, the date of the
most recent list of Holders required to be provided pursuant to Section 701)
prior to such first solicitation. If any record date is set pursuant to this
paragraph, the Holders of Outstanding Securities on such record date, and no
other Holders, shall be entitled to take the relevant action, whether or not
such Holders remain Holders after such record date; provided that no such action
shall be effective hereunder unless taken on or prior to the applicable
Expiration Date by Holders of the requisite principal amount of Outstanding
Securities on such record date. Nothing in this paragraph shall be construed to
prevent the Issuer from setting a new record date for any action for which a
record date has previously been set pursuant to this paragraph (whereupon the
record date previously set shall automatically and with no action by any Person
be cancelled and of no effect), and nothing in this paragraph shall be construed
to render ineffective any action taken by Holders of the requisite principal
amount of Outstanding Securities on the date such action is taken. Promptly
after any record date is set pursuant to this paragraph, the Issuer, at its own
expense, shall cause notice of such record date, the proposed action by Holders
and the applicable Expiration Date to be given to the Trustee in writing and to
each Holder of Securities in the manner set forth in Section 106.

     The Trustee may set any day as a record date for the purpose of determining
the Holders of Outstanding Securities entitled to join in the giving or making
of (i) any Notice of Default, (ii) any declaration of acceleration referred to
in Section 502, (iii) any request to institute proceedings referred to in
Section 507(2) or (iv) any direction referred to in Section 512.  If any record
date is set pursuant to this paragraph, the Holders of Outstanding Securities on
such record date, and no other Holders, shall be entitled to join in such
notice, declaration, request or direction, whether or not such Holders remain
Holders after such record date; provided that no such action shall be effective
hereunder unless taken on or prior to the applicable Expiration Date by Holders
of the requisite principal amount of Outstanding Securities on such record date.
Nothing in this paragraph shall be construed to prevent the Trustee from setting
a new record date for any action for which a record date has previously been set
pursuant to this paragraph (whereupon the record date previously set shall
automatically and with no action by any Person be cancelled and of no effect),
and nothing in this paragraph shall be construed to render ineffective any
action taken by Holders of the requisite principal amount of Outstanding
Securities on the date such action is taken. Promptly after any record date is
set pursuant to this paragraph, the Trustee, at the Issuer's expense, shall
cause notice of such record date, the proposed action by Holders and the
applicable Expiration Date to be given to the Issuer in writing and to each
Holder of Securities in the manner set forth in Section 106.

     With respect to any record date set pursuant to this Section, the party
hereto which sets such record dates may designate any day as the "Expiration
Date" and from time to time may change the Expiration Date to any earlier or
later day; provided that no such change shall be effective unless notice of the
proposed new Expiration Date is given to the other party hereto in writing, and
to each Holder of Securities in the manner set forth in Section 106, on or prior
to the existing Expiration Date. If an Expiration Date is not designated with
respect to any record date set pursuant to this

                                      -26-
<PAGE>

Section, the party hereto which set such record date shall be deemed to have
initially designated the 180th day after such record date as the Expiration Date
with respect thereto, subject to its right to change the Expiration Date as
provided in this paragraph. Notwithstanding the foregoing, no Expiration Date
shall be later than the 180th day after the applicable record date.

     Without limiting the foregoing, a Holder entitled hereunder to take any
action hereunder with regard to any particular Security may do so with regard to
all or any part of the principal amount of such Security or by one or more duly
appointed agents each of which may do so pursuant to such appointment with
regard to all or any part of such principal amount.

     SECTION 105.  Notices, Etc., to Trustee and Issuer.  Any request, demand,
                   ------------------------------------
authorization, direction, notice, consent, waiver or Act of Holders or other
document provided or permitted by this Indenture to be made upon, given or
furnished to, or filed with,

          (1) the Trustee by any Holder or by the Issuer shall be sufficient for
     every purpose hereunder if made, given, furnished or filed in writing, to
     or with the Trustee at its Corporate Trust Office, Attention: Corporate
     Trust Administration, or

          (2) the Issuer by the Trustee or by any Holder shall be sufficient for
     every purpose hereunder (unless otherwise herein expressly provided) if in
     writing and mailed, first-class postage prepaid, or delivered to the Issuer
     addressed to it at the address of its principal office specified in the
     first paragraph of this instrument, unless the Issuer shall notify the
     Trustee in writing of any other address, in which case at such other
     address.

     SECTION 106.  Notice to Holders; Waiver.  Where this Indenture provides for
                   -------------------------
notice to Holders of any event, such notice shall be sufficiently given (unless
otherwise herein expressly provided) if in writing and mailed, first-class
postage prepaid, to each Holder affected by such event, at his address as it
appears in the Security Register, not later than the latest date (if any), and
not earlier than the earliest date (if any), prescribed for the giving of such
notice, with a copy to the Trustee at the same time mailed or delivered in
accordance with Section 105(1) hereof.  In any case where notice to Holders is
given by mail, neither the failure to mail such notice, nor any defect in any
notice so mailed, to any particular Holder shall affect the sufficiency of such
notice with respect to other Holders.  Where this Indenture provides for notice
in any manner, such notice may be waived in writing by the Person entitled to
receive such notice, either before or after the event, and such waiver shall be
the equivalent of such notice.  Waivers of notice by Holders shall be filed with
the Trustee, but such filing shall not be a condition precedent to the validity
of any action taken in reliance upon such waiver.

     In case by reason of the suspension of regular mail service or by reason of
any other cause it shall be impracticable to give such notice by mail, then such
notification as shall be made with the approval of the Trustee shall constitute
a sufficient notification for every purpose hereunder.

                                      -27-
<PAGE>

     SECTION 107.  Conflict with Trust Indenture Act.  If any provision hereof
                   ---------------------------------
limits, qualifies or conflicts with a provision of the Trust Indenture Act that
is required under such Act to be part of and govern this Indenture, the latter
provision shall control.  If any provision of this Indenture modifies or
excludes any provision of the Trust Indenture Act that may be so modified or
excluded, the latter provision shall be deemed to apply to this Indenture as so
modified or to be excluded, as the case may be.  Until such time as this
Indenture shall be qualified under the Trust Indenture Act, this Indenture, the
Issuer and the Trustee shall be deemed for all purposes hereof to be subject to
and governed by the Trust Indenture Act to the same extent as would be the case
if this Indenture were so qualified on the date hereof.

     SECTION 108.  Effect of Headings and Table of Contents.  The Article and
                   ----------------------------------------
Section headings herein and the Table of Contents are for convenience only and
shall not affect the construction hereof.

     SECTION 109.  Successors and Assigns.  All covenants and agreements in this
                   ----------------------
Indenture by the Issuer shall bind its respective successors and assigns,
whether so expressed or not.

     SECTION 110.  Separability Clause.  In case any provision in this Indenture
                   -------------------
or in the Securities shall be invalid, illegal or unenforceable, the validity,
legality and enforceability of the remaining provisions shall not in any way be
affected or impaired thereby.

     SECTION 111.  Benefits of Indenture.  Nothing in this Indenture or in the
                   ---------------------
Securities, express or implied, shall give to any Person, other than the parties
hereto and its successors hereunder and the Holders of Securities, any benefit
or any legal or equitable right, remedy or claim under this Indenture.

     SECTION 112.  Governing Law.  THIS INDENTURE AND THE SECURITIES SHALL BE
                   -------------
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

     SECTION 113.  Legal Holidays.  In any case where any Interest Payment Date,
                   --------------
Redemption Date, Purchase Date or Stated Maturity of any Security shall not be a
Business Day, then (notwithstanding any other provision of this Indenture or of
the Securities) payment of interest or principal (and premium, if any) need not
be made on such date, but may be made on the next succeeding Business Day with
the same force and effect as if made on the Interest Payment Date, Redemption
Date or Purchase Date, or at the Stated Maturity, provided that no interest
shall accrue for the period from and after such Interest Payment Date,
Redemption Date or Purchase Date or Stated Maturity, as the case may be.

     SECTION 114.  Dollar Securities and Euro Securities; Relative Voting
                   ------------------------------------------------------
Rights.  The aggregate principal amount, or any portion thereof, of the
-------
Securities, at any date of determination, shall be the sum of (1) the U.S.
Dollar Equivalent at such date of determination, of the principal amount, or
portion thereof, as the case may be, of the Euro Securities and (2) the
principal amount,

                                      -28-
<PAGE>

or portion thereof, as the case may be, of the Dollar Securities, at such date
of determination. With respect to any matter requiring consent, waiver, approval
or other action of the holders of a specified percentage of the principal amount
of the Securities, such percentage shall be calculated, on the relevant date of
determination, by dividing (a) the principal amount, as of such date, of
Securities, the Holders of which have so consented by (b) the aggregate
principal amount, as of such date, of the Securities then outstanding, in each
case, as determined in accordance with the preceding sentence.

                                  ARTICLE TWO

                                Security Forms

     SECTION 201.  Forms Generally; Initial Forms of Rule 144A Dollar Securities
                   -------------------------------------------------------------
and Regulation S Dollar Securities and Rule 144A Euro Securities and Regulation
-------------------------------------------------------------------------------
S Euro Securities.  The Securities and the certificates of authentication shall
-----------------
be in substantially the forms set forth in this Article, with such appropriate
insertions, omissions, substitutions and other variations as are required or
permitted by this Indenture, and may have such letters, numbers or other marks
of identification and such legends or endorsements placed thereon as may be
required to comply with the rules of any securities exchange or as may,
consistently herewith, be determined by the officers executing such Securities,
as evidenced by its execution of the Securities.

     The definitive Securities shall be printed, lithographed or engraved or
produced by any combination of these methods on steel engraved borders or may be
produced in any other manner provided that such manner is permitted by the rules
of any securities exchange on which the Securities may be listed, all as
determined by the officers executing such Securities, as evidenced by its
execution of such Securities.

     Upon their original issuance, Rule 144A Dollar Securities shall be issued
in the form of one or more Global Dollar Securities registered in the name of
DTC, as Depositary, or its nominee and deposited with the Trustee, as custodian
for DTC, for credit by DTC to the respective accounts of beneficial owners of
the Securities represented thereby (or such other accounts as they may direct).
Such Global Dollar Securities, together with their Successor Securities which
are Global Dollar Securities other than the Regulation S Global Dollar Security,
are collectively herein called the "Restricted Global Dollar Security".  Upon
their original issuance, Rule 144A Euro Securities shall be issued in the form
of one or more Global Euro Securities registered in the name of Chase Nominees
Limited as nominee of Euroclear, as Depositary for the Rule 144A Euro
Securities, or its nominee and deposited with the Euro Agent at its Corporate
Agency Office, as custodian for Euroclear, for credit by Euroclear to the
respective accounts of beneficial owners of the Securities represented thereby
(or such other accounts as they may direct).  Such Global Euro Securities,
together with their Successor Securities which are Global Euro Securities other
than the Regulation S Global Euro Security, are collectively herein called the
"Restricted Global Euro Security" and together with the Restricted Global Dollar
Security, the "Restricted Global Security".

                                      -29-
<PAGE>

     Upon their original issuance, Regulation S Dollar Securities (herein called
"Regulation S Global Dollar Security") shall be issued in the form of a single
Global Dollar Security registered in the name of DTC, as Depositary, or its
nominee and deposited with the Trustee at its Corporate Trust Office, as
custodian for DTC, for credit to Morgan Guaranty Trust Company of New York,
Brussels Office, as operator of Euroclear and Cedelbank, in turn for credit to
the respective accounts of beneficial owners of the Dollar Securities
represented thereby (or such other accounts as such beneficial owners may
direct) in accordance with the rules thereof.  Upon their original issuance,
Regulation S Euro Securities (herein called "Regulation S Global Euro Security"
and together with the Regulation S Global Dollar Security, the "Regulation S
Global Security") shall be issued in the form of a single Global Euro Security
registered in the name of Chase Nominees Limited, as nominee of the Depositary
for the Regulation S Euro Securities, or its nominee and deposited with the Euro
Agent at its Corporate Agency Office, as custodian for the Depositary for the
Regulation S Euro Securities, for credit to the respective accounts of
beneficial owners of the Euro Securities represented thereby (or such other
accounts as such beneficial owners may direct) in accordance with the rules
thereof.

     Beneficial interests in the Regulation S Dollar Global Security and
Regulation S Euro Security may only be held through Euroclear and Cedelbank
until the expiration of the Distribution Compliance Period as provided in
Section 306(b)(4).

     SECTION 202.  Form of Face of Dollar Security.  [IF THE DOLLAR SECURITY IS
                   -------------------------------
A RESTRICTED DOLLAR SECURITY, THEN INSERT -- THE SECURITIES EVIDENCED HEREBY
HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933 (THE
"SECURITIES ACT") AND MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED
EXCEPT (A)(1) TO A PERSON WHOM THE TRANSFEROR REASONABLY BELIEVES IS A QUALIFIED
INSTITUTIONAL BUYER WITHIN THE MEANING OF RULE 144A UNDER THE SECURITIES ACT
ACQUIRING FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL
BUYER IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (2) IN AN OFFSHORE
TRANSACTION COMPLYING WITH RULE 903 OR RULE 904 OF REGULATION S UNDER THE
SECURITIES ACT, (3) TO AN INSTITUTIONAL ACCREDITED INVESTOR (AS DEFINED IN RULE
501(A)(1), (2), (3) OR (7) OF REGULATION D UNDER THE SECURITIES ACT) IN A
TRANSACTION EXEMPT FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, (4)
PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY
RULE 144 THEREUNDER (IF AVAILABLE), OR (5) PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT UNDER THE SECURITIES ACT AND (B) IN ACCORDANCE WITH ALL APPLICABLE
SECURITIES LAWS OF THE STATES OF THE UNITED STATES AND OTHER JURISDICTIONS.]

     [IF THIS DOLLAR SECURITY IS A GLOBAL DOLLAR SECURITY, THEN INSERT -- THIS
DOLLAR SECURITY IS A GLOBAL DOLLAR SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A
NOMINEE THEREOF.  THIS SECURITY MAY NOT BE EXCHANGED

                                      -30-
<PAGE>

IN WHOLE OR IN PART FOR A SECURITY REGISTERED, AND NO TRANSFER OF THIS SECURITY
IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH
DEPOSITARY OR A NOMINEE THEREOF, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED
IN THE INDENTURE.]

     [IF THIS DOLLAR SECURITY IS A GLOBAL DOLLAR SECURITY AND THE DEPOSITORY
TRUST COMPANY IS TO BE THE DEPOSITARY THEREFOR, THEN INSERT -- UNLESS THIS
DOLLAR SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY
TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE ISSUER OR ITS AGENT FOR
REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY DOLLAR SECURITY ISSUED IS
REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO
SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY
TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.]

     [IF THIS DOLLAR SECURITY IS A REGULATION S DOLLAR SECURITY, THEN INSERT --
THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES
SECURITIES ACT OF 1933 (THE "SECURITIES ACT") AND MAY NOT BE OFFERED, SOLD OR
DELIVERED IN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, ANY U.S.
PERSON, UNLESS SUCH SECURITIES ARE REGISTERED UNDER THE SECURITIES ACT OR AN
EXEMPTION FROM THE REGISTRATION REQUIREMENTS THEREOF IS AVAILABLE.]

                          EXODUS COMMUNICATIONS, INC.

                         10 3/4% Senior Notes due 2009

[If Restricted Dollar Security CUSIP No. [__________]
[If Regulation S Dollar Security -- ISIN No. [___________]

No. __________                                                        $________

     Exodus Communications, Inc., a corporation duly organized and existing
under the laws of Delaware (herein called the "Issuer", which term includes any
successor Person under the Indenture hereinafter referred to), for value
received, hereby promise to pay to __________________, or registered assigns,
the principal sum of _____________________ Dollars (such amount the

                                      -31-
<PAGE>

"principal amount" of this Dollar Security) [IF THE DOLLAR SECURITY IS A GLOBAL
DOLLAR SECURITY, THEN INSERT -- , or such other principal amount (which, when
taken together with the principal amounts of all other Outstanding Dollar
Securities, shall not exceed $475,000,000 in the aggregate at any time
($575,000,000, including the Additional Securities)) as may be set forth in the
records of the Trustee as referred to in accordance with the Indenture,] on
December 15, 2009 and to pay interest thereon from December 8, 1999 or from the
most recent Interest Payment Date to which interest has been paid or duly
provided for, payable in arrears semi-annually on June 15 and December 15 in
each year, commencing June 15, 2000 at the rate of 10 3/4% per annum, until the
principal hereof is paid or made available for payment. The interest so payable,
and punctually paid or duly provided for, on any Interest Payment Date will, as
provided in such Indenture, be paid to the Person in whose name this Dollar
Security (or one or more Predecessor Securities) is registered at the close of
business on the Regular Record Date for such interest, which shall be the June 1
or December 1 (whether or not a Business Day), as the case may be, next
preceding such Interest Payment Date. Any such interest not so punctually paid
or duly provided for will forthwith cease to be payable to the Holder on the
relevant Regular Record Date and may either be paid to the Person in whose name
this Dollar Security (or one or more Predecessor Securities) is registered at
the close of business on a Special Record Date for the payment of such Defaulted
Interest to be fixed by the Trustee in accordance with Section 308 of the
Indenture, notice whereof shall be given to Holders of Dollar Securities not
less than 10 days prior to such Special Record Date, or be paid at any time in
any other lawful manner not inconsistent with the requirements of any securities
exchange on which the Dollar Securities may be listed, and upon such notice as
may be required by such exchange, all as more fully provided in said Indenture.
Interest on this Dollar Security shall be computed on the basis set forth in the
Indenture.

     Payment of the principal of (and premium, if any) and any such interest on
this Dollar Security will be made at the office or agency of the Issuer in the
Borough of Manhattan, The City of New York, New York, maintained for such
purpose and at any other office or agency maintained by the Issuer for such
purpose, in such coin or currency of the United States of America as at the time
of payment is legal tender for payment of public and private debts; provided,
however, that at the option of the Issuer payment of interest may be made by
check mailed to the address of the Person entitled thereto as such address shall
appear in the Security Register; provided further that all payments of the
principal (and premium, if any) and interest on Dollar Securities, the Holders
of which hold more than $5.0 million in principal amount and have given wire
transfer instructions to the Issuer or its agent at least 10 Business Days prior
to the applicable payment date, will be required to be made by wire transfer of
immediately available funds to the accounts specified by such Holders in such
instructions.

     Reference is hereby made to the further provisions of this Dollar Security
set forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

                                      -32-
<PAGE>

     Unless the certificate of authentication hereon has been executed by the
Trustee or Authentication Agent referred to on the reverse hereof by manual
signature, this Dollar Security shall not be entitled to any benefit under the
Indenture or be valid or obligatory for any purpose.

     IN WITNESS WHEREOF, the Issuer has caused this instrument to be duly
executed.

                                    EXODUS COMMUNICATIONS, INC.

                                   By:_____________________________________
                                      Name:
                                      Title:

                                   Attest:_________________________________
                                      Name:
                                      Title:

CERTIFICATE OF AUTHENTICATION

This is one of the Dollar Securities referred to in the within-mentioned
Indenture.

Dated: December 8, 1999

Chase Manhattan Bank and Trust Company,
National Association,
as Trustee

By:___________________________
    Authorized Signatory

     SECTION 203.  Form of Reverse of Dollar Security.  This Dollar Security is
                   ----------------------------------
one of a duly authorized issue of Dollar Securities of the Issuer designated as
its Dollar Denominated 10 3/4% Senior Notes due 2009 (herein called the "Dollar
Securities"), issued and to be issued under an Indenture, dated as of December
1, 1999 (herein called the "Indenture", which term shall have the meaning
assigned to it in such instrument), among the Issuer and Chase Manhattan Bank
and Trust Company, National Association, as Trustee (herein called the
"Trustee", which term includes any successor trustee under the Indenture), to
which Indenture and all indentures supplemental thereto

                                      -33-
<PAGE>

reference is hereby made for a statement of the respective rights, limitations
of rights, duties and immunities thereunder of the Issuer, the Trustee and the
Holders of the Dollar Securities and of the terms upon which the Dollar
Securities are, and are to be, authenticated and delivered.

     The Dollar Securities are subject to redemption, at the option of the
Issuer, in whole or in part, at any time on or after December 15, 2004 and prior
to maturity, upon not less than 30 nor more than 60 days' notice mailed to each
Holder of Dollar Securities to be redeemed at such Holder's address appearing in
the Security Register, in amounts of $1,000 or an integral multiple of $1,000,
at the following Redemption Prices (expressed as percentages of the principal
amount) plus accrued and unpaid interest and Liquidated Damages, if any, to but
excluding the Redemption Date (subject to the right of Holders of record on the
immediately preceding Record Date to receive interest due on an Interest Payment
Date that is on or prior to the Redemption Date), if redeemed during the 12-
month period beginning December 15 of the years indicated below:

____                                                                ____________
Year                                                                Redemption
                                                                       Price

2004...............................................................  105.375%
2005...............................................................  103.583%
2006...............................................................  101.792%
2007 and thereafter................................................  100.000%

     In addition, at any time prior to December 15, 2002, the Issuer may redeem
up to 35% of the aggregate Outstanding principal amount of the Dollar Securities
with the Net Cash Proceeds of one or more sales of Capital Stock (other than
Disqualified Stock) at a Redemption Price equal to 110.75% of the aggregate
principal amount thereof, plus accrued and unpaid interest thereon and
Liquidated Damages, if any, to the date of redemption; provided that at least
65% of the original principal amount of the Dollar Securities remains
Outstanding immediately following such redemption.  In order to effect the
foregoing redemption, the Issuer must mail a notice of redemption no later than
45 days after the related sale of Capital Stock and must consummate such
redemption within 60 days of the closing of the sale of Capital Stock.

     The Dollar Securities do not have the benefit of any sinking fund
obligations.

     In the event of redemption or purchase pursuant to an Offer to Purchase of
this Dollar Security in part only, a new Dollar Security or Dollar Securities
for the unredeemed or unpurchased portion hereof will be issued in the name of
the Holder hereof upon the cancellation hereof.

     If an Event of Default shall occur and be continuing, there may be declared
due and payable the principal amount of (together with accrued and unpaid
interest on) the Dollar Securities, in the manner and with the effect provided
in the Indenture.

     [IF DOLLAR SECURITY IS A RESTRICTED SECURITY, THEN INSERT -- The Holder of
this Dollar Security (and any Person that has a beneficial interest in this
Dollar Security) is

                                      -34-
<PAGE>

entitled to the benefits of an Exchange and Registration Rights Agreement, dated
as of December 1, 1999, and as the same may be amended from time to time (the
"Exchange and Registration Rights Agreement"), executed by the Issuer. The
Exchange and Registration Rights Agreement provides that Liquidated Damages will
be payable by the Issuer on the Dollar Securities for specified periods if the
Issuer does not comply with certain of its obligations thereunder. Issuer agrees
to pay Liquidated Damages, if any, accruing on this Dollar Security.]

     The Indenture provides that, subject to certain conditions, if (i) certain
Net Cash Proceeds are available to the Issuer as a result of an Asset Sale or
(ii) a Change of Control occurs, the Issuer shall be required to make an Offer
to Purchase for all or a specified portion of the Dollar Securities.

     The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Issuer and the rights of the Holders of the Securities under the Indenture at
any time by the Issuer and the Trustee with the consent of the Holders of a
majority in aggregate principal amount of the Securities at the time
Outstanding.  The Indenture also contains provisions permitting the Holders of
specified percentages in aggregate principal amount of the Securities at the
time Outstanding, on behalf of the Holders of all the Securities, to waive
compliance by the Issuer with certain provisions of the Indenture and certain
past defaults under the Indenture and its consequences.  Any such consent or
waiver by the Holder of this Dollar Security shall be conclusive and binding
upon such Holder and upon all future Holders of this Dollar Security and of any
Dollar Security issued upon the registration of transfer hereof or in exchange
herefor or in lieu hereof, whether or not notation of such consent or waiver is
made upon this Dollar Security.

     As provided in and subject to the provisions of the Indenture, the Holder
of this Dollar Security shall not have the right to institute any proceeding
with respect to the Indenture or for the appointment of a receiver or trustee or
for any other remedy thereunder, unless such Holder shall have previously given
the Trustee written notice of a continuing Event of Default with respect to the
Securities, the Holders of not less than 25% in principal amount of the
Securities at the time Outstanding shall have made written request to the
Trustee to institute proceedings in respect of such Event of Default as Trustee
and offered the Trustee reasonable indemnity and the Trustee shall not have
received from the Holders of a majority in principal amount of Securities at the
time Outstanding a direction inconsistent with such request and shall have
failed to institute any such proceeding for 60 days after receipt of such
notice, request and offer of indemnity.  The foregoing shall not apply to
certain suits described in the Indenture, including any suit instituted by the
Holder of this Dollar Security for the enforcement of any payment of principal
hereof or any premium or interest hereon on or after the respective due dates
expressed herein (or, in the case of redemption, on or after the Redemption Date
or, in the case of any purchase of this Dollar Security required to be made
pursuant to an Offer to Purchase, on the Purchase Date).

     No reference herein to the Indenture and no provision of this Dollar
Security or of the Indenture shall alter or impair the obligation of the Issuer,
which is absolute and unconditional, to

                                      -35-
<PAGE>

pay the principal of (and premium, if any) and interest on this Dollar Security
at the times, place and rate, and in the coin or currency, herein prescribed.

     As provided in the Indenture and subject to certain limitations therein set
forth, the transfer of this Dollar Security is registrable in the Security
Register, upon surrender of this Dollar Security for registration of transfer at
the office or agency of the Issuer in the Borough of Manhattan, The City of New
York, duly endorsed by, or accompanied by a written instrument of transfer in
form satisfactory to the Issuer and the Security Registrar duly executed by, the
Holder hereof or his attorney duly authorized in writing, and thereupon one or
more new Dollar Securities, of authorized denominations and for the same
aggregate principal amount, will be issued to the designated transferee or
transferees.

     The Dollar Securities are issuable only in registered form without coupons
in denominations of $1,000 and any integral multiple thereof.  As provided in
the Indenture and subject to certain limitations therein set forth, Dollar
Securities are exchangeable for a like aggregate principal amount of Dollar
Securities of a different authorized denomination, as requested by the Holder
surrendering the same.

     No service charge shall be made for any such registration of transfer or
exchange, but the Issuer may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

     Prior to due presentment of this Dollar Security for registration of
transfer, the Issuer, the Trustee and any agent of the Issuer or the Trustee may
treat the Person in whose name this Dollar Security is registered as the owner
hereof for all purposes, whether or not this Dollar Security be overdue, and
neither the Issuer, the Trustee nor any such agent shall be affected by notice
to the contrary.

     Interest on this Dollar Security shall be computed on the basis of a 360-
day year of twelve 30-day months.

     All terms used in this Dollar Security which are defined in the Indenture
shall have the meanings assigned to them in the Indenture.

     The Indenture and this Dollar Security shall be governed by and construed
in accordance with the laws of the State of New York.

                      OPTION OF HOLDER TO ELECT PURCHASE

     If you want to elect to have this Dollar Security purchased in its entirety
by the Issuer pursuant to Section 1015 or 1016 of the Indenture, check the box:

                                      -36-
<PAGE>

     [_]

     If you want to elect to have only a part of this Dollar Security purchased
by the Issuer pursuant to Section 1015 or 1016 of the Indenture, state the
amount:

     $_____________

Dated:  Your Signature:_________________________________________________________
                       (Sign exactly as name appears on the other side of this
                       Dollar Security)

         Signature Guarantee:___________________________________________________
                             (Signature must be guaranteed by an eligible
                             Guarantor Institution (banks, stockbrokers, savings
                             and loan associations and credit unions) with
                             membership in an approved signature medallion
                             program pursuant to Securities and Exchange
                             Commission Rule 17Ad-15.)

     SECTION 204.  Form of Face of Euro Security.  [IF THE EURO SECURITY IS A
                   -----------------------------
RESTRICTED EURO SECURITY, THEN INSERT -- THE SECURITIES EVIDENCED HEREBY HAVE
NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933 (THE
"SECURITIES ACT") AND MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED
EXCEPT (A)(1) TO A PERSON WHOM THE TRANSFEROR REASONABLY BELIEVES IS A QUALIFIED
INSTITUTIONAL BUYER WITHIN THE MEANING OF RULE 144A UNDER THE SECURITIES ACT
ACQUIRING FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL
BUYER IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (2) IN AN OFFSHORE
TRANSACTION COMPLYING WITH RULE 903 OR RULE 904 OF REGULATION S UNDER THE
SECURITIES ACT, (3) TO AN INSTITUTIONAL ACCREDITED INVESTOR (AS DEFINED IN RULE
501(A)(1), (2), (3) OR (7) OF REGULATION D UNDER THE SECURITIES ACT) IN A
TRANSACTION EXEMPT FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, (4)
PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY
RULE 144 THEREUNDER (IF AVAILABLE), OR (5) PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT UNDER THE SECURITIES ACT AND (B) IN ACCORDANCE WITH ALL APPLICABLE
SECURITIES LAWS OF THE STATES OF THE UNITED STATES AND OTHER JURISDICTIONS.]

     [IF THIS EURO SECURITY IS A GLOBAL EURO SECURITY, THEN INSERT -- THIS EURO
SECURITY IS A GLOBAL EURO SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A
NOMINEE THEREOF.  THIS EURO SECURITY MAY NOT BE EXCHANGED IN WHOLE OR IN PART
FOR A SECURITY REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART
MAY BE REGISTERED, IN THE

                                      -37-
<PAGE>

NAME OF ANY PERSON OTHER THAN SUCH DEPOSITARY OR A NOMINEE THEREOF, EXCEPT IN
THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.]

     [IF THIS EURO SECURITY IS A RESTRICTED GLOBAL EURO SECURITY AND EUROCLEAR
IS TO BE THE DEPOSITARY THEREFOR, THEN INSERT -- UNLESS THIS EURO SECURITY IS
PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF MORGAN GUARANTY AND TRUST OF NEW
YORK, BRUSSELS OFFICE, AS OPERATOR OF EUROCLEAR ("MORGAN"), TO THE ISSUER OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY EURO SECURITY
ISSUED IS REGISTERED IN THE NAME OF CHASE NOMINEES LIMITED OR IN SUCH OTHER NAME
AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF MORGAN (AND ANY PAYMENT IS
MADE TO CHASE MANHATTAN BANK LONDON OR TO SUCH OTHER ENTITY AS IS REQUESTED BY
AN AUTHORIZED REPRESENTATIVE OF EUROCLEAR), ANY TRANSFER, PLEDGE OR OTHER USE
HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE
REGISTERED OWNER HEREOF, CHASE NOMINEES LIMITED, OR OTHER NOMINEE OF EUROCLEAR,
HAS AN INTEREST HEREIN.]

     [IF THIS EURO SECURITY IS A REGULATION S GLOBAL EURO SECURITY AND MORGAN
GUARANTY AND TRUST OF NEW YORK, BRUSSELS OFFICE, AS OPERATOR OF EUROCLEAR AND
CEDELBANK, IS TO BE THE DEPOSITARY THEREFOR, THEN INSERT -- UNLESS THIS EURO
SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF MORGAN GUARANTY AND
TRUST OF NEW YORK, BRUSSELS OFFICE, AS OPERATOR OF EUROCLEAR AND CEDELBANK
("MORGAN"), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR
PAYMENT, AND ANY EURO SECURITY ISSUED IS REGISTERED IN THE NAME OF CHASE
NOMINEES LIMITED OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF MORGAN (AND ANY PAYMENT IS MADE TO CHASE MANHATTAN BANK LONDON
OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF
EUROCLEAR AND CEDELBANK), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CHASE NOMINEES LIMITED, HAS AN INTEREST HEREIN.]

     [IF THIS EURO SECURITY IS A REGULATION S EURO SECURITY, THEN INSERT -- THE
SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES
SECURITIES ACT OF 1933 (THE "SECURITIES ACT") AND MAY NOT BE OFFERED, SOLD OR
DELIVERED IN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, ANY U.S.
PERSON, UNLESS SUCH SECURITIES ARE REGISTERED UNDER THE SECURITIES ACT OR AN
EXEMPTION FROM THE REGISTRATION REQUIREMENTS THEREOF IS AVAILABLE.]

                          EXODUS COMMUNICATIONS, INC.

                                      -38-
<PAGE>

                         10 3/4% Senior Notes due 2009

[If Restricted Euro Security -- ISIN No. [_____ _____]
[If Regulation S Euro Security -- ISIN No. [___________]

No. __________                                                      Euro________

     Exodus Communications, Inc., a corporation duly organized and existing
under the laws of Delaware (herein called the "Issuer", which term includes any
successor Person under the Indenture hereinafter referred to), for value
received, hereby promise to pay to __________________, or registered assigns,
the principal sum of _____________________ Euros (such amount the "principal
amount" of this Euro Security) [IF THE EURO SECURITY IS A GLOBAL EURO SECURITY,
THEN INSERT -- , or such other principal amount (which, when taken together with
the principal amounts of all other Outstanding Euro Securities, shall not exceed
Euro 225,000,000 in the aggregate at any time) as may be set forth in the
records of the Trustee or Authentication Agent as referred to in accordance with
the Indenture,] on December 15, 2009 and to pay interest thereon from December
8, 1999 or from the most recent Interest Payment Date to which interest has been
paid or duly provided for, payable in arrears semi-annually on June 15 and
December 15 in each year, commencing June 15, 2000 at the rate of 10 3/4% per
annum, until the principal hereof is paid or made available for payment.  The
interest so payable, and punctually paid or duly provided for, on any Interest
Payment Date will, as provided in such Indenture, be paid to the Person in whose
name this Euro Security (or one or more Predecessor Securities) is registered at
the close of business on the Regular Record Date for such interest, which shall
be the June 1 or December 1 (whether or not a Business Day), as the case may be,
next preceding such Interest Payment Date.  Any such interest not so punctually
paid or duly provided for will forthwith cease to be payable to the Holder on
the relevant Regular Record Date and may either be paid to the Person in whose
name this Euro Security (or one or more Predecessor Securities) is registered at
the close of business on a Special Record Date for the payment of such Defaulted
Interest to be fixed by the Trustee or Authentication Agent in accordance with
Section 308 of the Indenture, notice whereof shall be given to Holders of Euro
Securities not less than 10 days prior to such Special Record Date, or be paid
at any time in any other lawful manner not inconsistent with the requirements of
any securities exchange on which the Euro Securities may be listed, and upon
such notice as may be required by such exchange, all as more fully provided in
said Indenture.  Interest on this Euro Security shall be computed on the basis
set forth in the Indenture.

     Payment of the principal of (and premium, if any) and any such interest on
this Euro Security will be made at the office or agency of the Euro Paying Agent
maintained for such purpose and at any other office or agency maintained by the
Issuer for such purpose, in Euros; provided, however, that at the option of the
Issuer payment of interest may be made by check mailed to the address of the
Person entitled thereto as such address shall appear in the Security Register;
provided further that

                                      -39-
<PAGE>

all payments of the principal (and premium, if any) and interest on Euro
Securities, the Holders of which hold more than Euro 5.0 million in principal
amount and have given wire transfer instructions to the Issuer or its agent at
least 10 Business Days prior to the applicable payment date, will be required to
be made by wire transfer of immediately available funds to the accounts
specified by such Holders in such instructions.

     Reference is hereby made to the further provisions of this Euro Security
set forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

     Unless the certificate of authentication hereon has been executed by the
Trustee or Authentication Agent referred to on the reverse hereof by manual
signature, this Euro Security shall not be entitled to any benefit under the
Indenture or be valid or obligatory for any purpose.

     IN WITNESS WHEREOF, the Issuer has caused this instrument to be duly
executed.

                                    EXODUS COMMUNICATIONS, INC.

                                    By:________________________________
                                      Name:
                                      Title:

                                    Attest:____________________________
                                      Name:
                                      Title:

CERTIFICATE OF AUTHENTICATION

This is one of the Euro Securities referred to in the within-mentioned
Indenture.

Dated: December 8, 1999

Chase Manhattan Bank London,
as Authentication Agent

By:_____________________________________
     Authorized Signatory

                                      -40-
<PAGE>

     SECTION 205.  Form of Reverse of Euro Security.  This Euro Security is one
                   --------------------------------
of a duly authorized issue of Euro Securities of the Issuer designated as its
Euro Denominated 10 3/4% Senior Notes due 2009 (herein called the "Euro
Securities"), issued and to be issued under an Indenture, dated as of December
1, 1999 (herein called the "Indenture", which term shall have the meaning
assigned to it in such instrument), among the Issuer and Chase Manhattan Bank
and Trust Company, National Association, as Trustee (herein called the
"Trustee", which term includes any successor trustee under the Indenture), to
which Indenture and all indentures supplemental thereto reference is hereby made
for a statement of the respective rights, limitations of rights, duties and
immunities thereunder of the Issuer, the Trustee or Authentication Agent and the
Holders of the Euro Securities and of the terms upon which the Euro Securities
are, and are to be, authenticated and delivered.

     The Euro Securities are subject to redemption, at the option of the Issuer,
in whole or in part, at any time on or after December 15, 2004 and prior to
maturity, upon not less than 30 nor more than 60 days' notice mailed to each
Holder of Euro Securities to be redeemed at such Holder's address appearing in
the Security Register, in amounts of Euro 1,000 or an integral multiple of Euro
1,000, at the following Redemption Prices (expressed as percentages of the
principal amount) plus accrued and unpaid interest and Liquidated Damages, if
any, to but excluding the Redemption Date (subject to the right of Holders of
record on the immediately preceding Record Date to receive interest due on an
Interest Payment Date that is on or prior to the Redemption Date), if redeemed
during the 12-month period beginning December 15 of the years indicated below:

____                                                                ___________
Year                                                                Redemption
                                                                       Price

2004...............................................................  105.375%
2005...............................................................  103.583%
2006...............................................................  101.792%
2007 and thereafter................................................  100.000%

     In addition, at any time prior to December 15, 2002, the Issuer may redeem
up to 35% of the aggregate Outstanding principal amount of the Euro Securities
with the Net Cash Proceeds of one or more sales of Capital Stock (other than
Disqualified Stock) at a Redemption Price equal to 110.75% of the aggregate
principal amount thereof, plus accrued and unpaid interest thereon and
Liquidated Damages, if any, to the date of redemption; provided that at least
65% of the original principal amount of the Euro Securities remains Outstanding
immediately following such redemption.  In order to effect the foregoing
redemption, the Issuer must mail a notice of redemption no later than 45 days
after the related sale of Capital Stock and must consummate such redemption
within 60 days of the closing of the sale of Capital Stock.

     The Euro Securities do not have the benefit of any sinking fund
obligations.

                                      -41-
<PAGE>

     In the event of redemption or purchase pursuant to an Offer to Purchase of
this Euro Security in part only, a new Euro Security or Euro Securities for the
unredeemed or unpurchased portion hereof will be issued in the name of the
Holder hereof upon the cancellation hereof.

     If an Event of Default shall occur and be continuing, there may be declared
due and payable the principal amount of (together with accrued and unpaid
interest on) the Euro Securities, in the manner and with the effect provided in
the Indenture.

     [IF EURO SECURITY IS A RESTRICTED SECURITY, THEN INSERT -- The Holder of
this Euro Security (and any Person that has a beneficial interest in this Euro
Security) is entitled to the benefits of an Exchange and Registration Rights
Agreement, dated as of December 1, 1999, and as the same may be amended from
time to time (the "Exchange and Registration Rights Agreement"), executed by the
Issuer.  The Exchange and Registration Rights Agreement provides that Liquidated
Damages will be payable by the Issuer on the Euro Securities for specified
periods if the Issuer does not comply with certain of its obligations
thereunder. Issuer agrees to pay Liquidated Damages, if any, accruing on this
Euro Security.]

     The Indenture provides that, subject to certain conditions, if (i) certain
Net Cash Proceeds are available to the Issuer as a result of an Asset Sale or
(ii) a Change of Control occurs, the Issuer shall be required to make an Offer
to Purchase for all or a specified portion of the Euro Securities.

     The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Issuer and the rights of the Holders of the Securities under the Indenture at
any time by the Issuer and the Trustee or Authentication Agent with the consent
of the Holders of a majority in aggregate principal amount of the Securities at
the time Outstanding.  The Indenture also contains provisions permitting the
Holders of specified percentages in aggregate principal amount of the Securities
at the time Outstanding, on behalf of the Holders of all the Securities, to
waive compliance by the Issuer with certain provisions of the Indenture and
certain past defaults under the Indenture and its consequences.  Any such
consent or waiver by the Holder of this Euro Security shall be conclusive and
binding upon such Holder and upon all future Holders of this Euro Security and
of any Euro Security issued upon the registration of transfer hereof or in
exchange herefor or in lieu hereof, whether or not notation of such consent or
waiver is made upon this Euro Security.

     As provided in and subject to the provisions of the Indenture, the Holder
of this Euro Security shall not have the right to institute any proceeding with
respect to the Indenture or for the appointment of a receiver or trustee or
authentication agent or for any other remedy thereunder, unless such Holder
shall have previously given the Trustee or Authentication Agent written notice
of a continuing Event of Default with respect to the Securities, the Holders of
not less than 25% in principal amount of the Securities at the time Outstanding
shall have made written request to the Trustee or Authentication Agent to
institute proceedings in respect of such Event of Default as Trustee or
Authentication Agent and offered the Trustee or Authentication Agent reasonable
indemnity and the Trustee or Authentication Agent shall not have received from
the Holders of a

                                      -42-
<PAGE>

majority in principal amount of Securities at the time Outstanding a direction
inconsistent with such request and shall have failed to institute any such
proceeding for 60 days after receipt of such notice, request and offer of
indemnity. The foregoing shall not apply to certain suits described in the
Indenture, including any suit instituted by the Holder of this Euro Security for
the enforcement of any payment of principal hereof or any premium or interest
hereon on or after the respective due dates expressed herein (or, in the case of
redemption, on or after the Redemption Date or, in the case of any purchase of
this Euro Security required to be made pursuant to an Offer to Purchase, on the
Purchase Date).

     No reference herein to the Indenture and no provision of this Euro Security
or of the Indenture shall alter or impair the obligation of the Issuer, which is
absolute and unconditional, to pay the principal of (and premium, if any) and
interest on this Euro Security at the times, place and rate, and in the coin or
currency, herein prescribed.

     As provided in the Indenture and subject to certain limitations therein set
forth, the transfer of this Euro Security is registrable in the Security
Register, upon surrender of this Euro Security for registration of transfer at
the office or agency of the Issuer in the Borough of Manhattan, The City of New
York, duly endorsed by, or accompanied by a written instrument of transfer in
form satisfactory to the Issuer and the Security Registrar duly executed by, the
Holder hereof or his attorney duly authorized in writing, and thereupon one or
more new Euro Securities, of authorized denominations and for the same aggregate
principal amount, will be issued to the designated transferee or transferees.

     The Euro Securities are issuable only in registered form without coupons in
denominations of Euro 1,000 and any integral multiple thereof.  As provided in
the Indenture and subject to certain limitations therein set forth, Euro
Securities are exchangeable for a like aggregate principal amount of Euro
Securities of a different authorized denomination, as requested by the Holder
surrendering the same.

     No service charge shall be made for any such registration of transfer or
exchange, but the Issuer may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

     Prior to due presentment of this Euro Security for registration of
transfer, the Issuer, the Trustee or Authentication Agent and any agent of the
Issuer or the Trustee or Authentication Agent may treat the Person in whose name
this Euro Security is registered as the owner hereof for all purposes, whether
or not this Euro Security be overdue, and neither the Issuer, the Trustee nor
Authentication Agent nor any such agent shall be affected by notice to the
contrary.

     Interest on this Euro Security shall be computed on the basis of a 360-day
year of twelve 30-day months.

                                      -43-
<PAGE>

     All terms used in this Euro Security which are defined in the Indenture
shall have the meanings assigned to them in the Indenture.

     The Indenture and this Euro Security shall be governed by and construed in
accordance with the laws of the State of New York.

                                  OPTION OF HOLDER TO ELECT PURCHASE

     If you want to elect to have this Euro Security purchased in its entirety
by the Issuer pursuant to Section 1015 or 1016 of the Indenture, check the box:

     [_]

     If you want to elect to have only a part of this Euro Security purchased by
the Issuer pursuant to Section 1015 or 1016 of the Indenture, state the amount:

     Euro _____________

Dated:    Your Signature:_______________________________________________________
                         (Sign exactly as name appears on the other side of this
                         Euro Security)

               Signature Guarantee:_____________________________________________
                                   (Signature must be guaranteed by an eligible
                                   Guarantor Institution (banks, stockbrokers,
                                   savings and loan associations and credit
                                   unions) with membership in an approved
                                   signature medallion program pursuant to
                                   Securities and Exchange Commission Rule 17Ad-
                                   15.)

                                      -44-
<PAGE>

     SECTION 206.  Form of Certificate of Authentication.  The Certificate of
                   -------------------------------------
Authentication for the Dollar Securities shall be in substantially the following
form:

     This is one of the Securities referred to in the within-mentioned
Indenture.

     Dated:
               Chase Manhattan Bank and Trust Company,
                National Association
                as Trustee

               By__________________________________
                    Authorized Signatory

     The Certificate of Authentication for the Euro Securities shall be in
substantially the following form:

     This is one of the Securities referred to in the within-mentioned
Indenture.

     Dated:
               Chase Manhattan Bank London
                as Authentication Agent

               By__________________________________
                    Authorized Signatory

                                 ARTICLE THREE

                                The Securities

     SECTION 301.  Title and Terms.  The aggregate principal amount of Dollar
                   ---------------
Securities which may be authenticated and delivered under this Indenture is
limited to $375,000,000 ($475,000,000 including Additional Securities, which
amounts shall be increased to $475,000,000 ($575,000,000 including Additional
Securities) if the Issuer would be permitted, after giving pro forma effect to
the incurrence of such Debt, to incur $1.00 of additional Debt under the first
paragraph of Section 1008 hereof.  The aggregrate principal amount of Euro
Securities which may be authenticated and delivered under this Indenture is
limited to Euro 125,000,000 which amount shall be increased to Euro 225,000,000
if the Issuer would be permitted, after giving pro forma effect to the
incurrence of

                                      -45-
<PAGE>

such Debt, to incur $1.00 of additional Debt under the first paragraph of
Section 1008 hereof, except for Securities authenticated and delivered upon
registration of transfer of, or in exchange for, or in lieu of, other Securities
pursuant to Section 304, 305, 306, 307, 906 or 1108 or in connection with an
Offer to Purchase pursuant to Section 1015 or 1016 (all Securities referred to
in this exception being deemed "Substitute Securites"). The Issuer may from time
to time issue Additional Securities, in each case pursuant to a Board Resolution
and subject to Section 303. The Issuer may issue Exchange Securities from time
to time pursuant to an Exchange Offer, in each case pursuant to a Board
Resolution and subject to Section 303, in authorized denominations in exchange
for a like principal amount of Original Securities or Additional Securities.
Upon any such exchange the Original Securities or Additional Securities, as the
case may be, shall be cancelled in accordance with Section 310 and shall no
longer be deemed Outstanding for any purpose.

     The Dollar Securities (including Additional Securities) shall be known and
designated as the "Dollar Denominated 10 3/4% Senior Notes due 2009" of the
Issuer.  The Euro Securities shall be known and designated as the "Euro
Denominated 10 3/4% Senior Notes due 2009" of the Issuer.  Their final maturity
date shall be December 15, 2009 and they shall bear interest at the rate of 10
3/4% per annum, from December 8, 1999 or from the most recent Interest Payment
Date to which interest has been paid or duly provided for, as the case may be,
regardless of when issued, payable semi-annually in arrears on June 15 and
December 15, commencing June 15, 2000, until the principal thereof is paid or
made available for payment.  Notwithstanding the foregoing, Liquidated Damages
shall be payable on the Dollar Securities and Euro Securities, respectively,
under the circumstances and in the manner specified in the Exchange and
Registration Rights Agreement.  Accrued Liquidated Damages, if any, shall be
paid in cash in arrears semi-annually on June 15 and December 15 in each year.
Whenever in this Indenture there is mentioned, in any context, interest on, or
in respect of, any Security, such mention shall be deemed to include mention of
Liquidated Damages to the extent that, in such context, Liquidated Damages is,
was or would be accrued or payable in respect thereof and express mention of
Liquidated Damages in any provisions hereof shall not be construed as excluding
Liquidated Damages in those provisions hereof where such express mention is not
made.

     The principal of (and premium, if any) and interest on the Dollar
Securities shall be payable at the office or agency of the Issuer in the Borough
of Manhattan, The City of New York maintained for such purpose and on the Euro
Securities shall be payable at the office or agency of the Euro Paying Agent in
London, England and at any other office or agency maintained by the Issuer for
such purpose; provided, however, that at the option of the Issuer payment of
interest may be made by check mailed to the address of the Person entitled
thereto as such address shall appear in the Security Register.

     The Securities shall be subject to repurchase by the Issuer pursuant to an
Offer to Purchase as provided in Sections 1015 and 1016.

     The Securities shall be redeemable as provided in Article Eleven.

                                      -46-
<PAGE>

     The Securities shall be subject to defeasance and covenant defeasance as
provided in Article Twelve.

     The Securities shall not have the benefit of any sinking fund obligation.

     Unless the context otherwise requires, the Original Securities, the
Additional Securities and the Exchange Securities (as well as the Dollar
Securites and the Euro Securities) shall constitute one class and series of
securities for all purposes under this Indenture, including with respect to any
amendment, waiver, acceleration or other Act of Holders, redemption (other than
at the election of the Issuer as described in the third paragraph of the reverse
side of Form of Dollar Security and reverse side of Form of Euro Security) or
Offer to Purchase.

     SECTION 302.  Denominations.  The Dollar Securities shall be issuable only
                   -------------
in registered form without coupons and only in denominations of $1,000 and any
integral multiples thereof.  The Euro Securities shall be issuable only in
registered form without coupons and only in denominations of Euro 1,000 and any
integral multiples thereof.

     SECTION 303.  Execution, Authentication, Delivery and Dating.  The
                   ----------------------------------------------
Securities shall be executed on behalf of the Issuer by any two of the Chairman
of the Board, Chief Executive Officer, the President, any Vice President, the
Secretary, any Assistant Secretary, the Chief Financial Officer, the Treasurer
or any Assistant Treasurer. The signature of any of these officers on the
Securities may be manual or facsimile.

     Securities bearing the manual or facsimile signatures of individuals who
were at any time the proper officers of an Issuer shall bind the Issuer,
notwithstanding that such individuals or any of them have ceased to hold such
offices at the time of the authentication and delivery of such Securities or did
not hold such offices at the date of such Securities.

     At any time and from time to time after the execution and delivery of this
Indenture, the Issuer may deliver Original Securities executed by the Issuer to
the Trustee or Authentication Agent for authentication, together with an Issuer
Order for the authentication and delivery of such Original Securities; and the
Trustee or Authentication Agent in accordance with the Issuer order shall
authenticate and make available for delivery such Original Securities as
provided in this Indenture and not otherwise.

     At any time and from time to time after the execution and delivery of this
Indenture and on or prior to December 8, 2000, the Issuer may, pursuant to a
Board Resolution, deliver Additional Securities executed by the Issuer to the
Trustee or Authentication Agent for authentication, together with an Issuer
Order for the authentication and delivery of such Additional Securities, an
Officers' Certificate stating that the issuance of such Additional Securities
will not result in a breach or violation of any of the covenants contained in
this Indenture and that all conditions precedent to such issuance,
authentication and delivery of Additional Securities in this Indenture have been
fully complied with and satisfied, and the Trustee or Authentication Agent in
accordance with the Issuer

                                      -47-
<PAGE>

Order shall authenticate and deliver such Securities. Prior to authenticating
such Additional Securities, and accepting any additional responsibilities under
this Indenture in relation to such Securities, the Trustee and any
Authentication Agent shall be entitled to receive, if requested, and (subject to
Section 601) shall be fully protected in relying upon, an Opinion of Counsel
stating in substance that the issuance of such Additional Securities will not
result in a breach or violation of any of the covenants contained in this
Indenture and as to the due authorization, execution and delivery of the
Additional Securities, the enforceability of the Additional Securities, and the
duly incorporated status and good standing of the Issuer. If the Issuer issues
Securities on or after December 8, 1999 (other than Securities issued pursuant
to Section 304, 305, 306, 307, 906 or 1108) the Issuer shall deliver the same
documents as certificates that it is required to deliver in connection with the
issuance of Additional Securities.

     At any time and from time to time after the execution and delivery of this
Indenture and after the effectiveness of a registration statement under the
Securities Act with respect to such Securities, the Issuer may deliver Exchange
Securities executed by the Issuer to the Trustee or Authentication Agent for
authentication, together with an Issuer Order for the authentication and
delivery of such Exchange Securities and a like principal amount of Original
Securities for cancellation in accordance with Section 310 of this Indenture,
and the Trustee or Authentication Agent in accordance with the Issuer Order
shall authenticate and make available for delivery such Securities.  Prior to
authenticating such Exchange Securities, and accepting any additional
responsibilities under this Indenture in relation to such Securities, the
Trustee shall be entitled to receive, if requested, and (subject to Section 601)
shall be fully protected in relying upon, an Opinion of Counsel as to the due
authorization, execution and delivery of the Exchange Securities, the
enforceability of the Exchange Securities, and the duly incorporated status and
good standing of the Issuer.

     Each Security shall be dated the date of its authentication.

     No Security shall be entitled to any benefit under this Indenture or be
valid or obligatory for any purpose unless there appears on such Security a
certificate of authentication substantially in the form provided for herein
executed by the Trustee or Authentication Agent by manual signature, and such
certificate upon any Security shall be conclusive evidence, and the only
evidence, that such Security has been duly authenticated and delivered
hereunder.

     SECTION 304.  Temporary Securities.  Pending the preparation of definitive
                   --------------------
Securities, the Issuer may execute, and upon Issuer Order, the Trustee or
Authentication Agent shall authenticate and deliver, temporary Securities, which
Securities are printed, lithographed, typewritten, mimeographed or otherwise
produced, in any authorized denomination, substantially of the tenor of the
definitive Securities in lieu of which they are issued and with such appropriate
insertions, omissions, substitutions and other variations as the officers
executing such Securities may determine, as evidenced by their execution
thereof.

     If temporary Securities are issued, the Issuer will cause definitive
Securities to be prepared without unreasonable delay.  After the preparation of
definitive Securities, the temporary Securities

                                      -48-
<PAGE>

shall be exchangeable for definitive Securities upon surrender of the temporary
Securities at any office or agency of the Issuer designated pursuant to Section
1002, without charge to the Holder. Upon surrender for cancellation (which
cancellation shall be only by the Trustee) of any one or more temporary
Securities, the Issuer shall execute and the Trustee or Authentication Agent
shall authenticate and deliver in exchange therefor a like principal amount of
definitive Securities of authorized denominations. Until so exchanged, the
temporary Securities shall in all respects be entitled to the same rights and
benefits under this Indenture as definitive Securities.

     SECTION 305.  Global Securities.  (a)  Each Global Security authenticated
                   -----------------
under this Indenture shall be registered in the name of the Depositary
designated by the Issuer for such Global Security or a nominee thereof and
delivered to such Depositary or a nominee thereof or custodian therefor, and
each such Global Security shall constitute a single Security for all purposes of
this Indenture.

     (b)  Notwithstanding any other provision in this Indenture, no Global
Security may be exchanged in whole or in part for Securities registered, and no
transfer of a Global Security in whole or in part may be registered, in the name
of any Person other than the Depositary for such Global Security or a nominee
thereof unless (i) such Depositary (A) has notified the Issuer that it is
unwilling or unable to continue as Depositary for such Global Security or (B) is
principally located in the U.S. and has ceased to be a clearing agency
registered as such under the Exchange Act, and in either case the Issuer fails
to appoint a successor Depositary within 120 days of such notice, (ii) the
Issuer executes and delivers to the Trustee an Issuer Order stating that it
elects to cause the issuance of the Securities in certificated form and that all
Global Securities shall be exchanged in whole for Securities that are not Global
Securities (in which case such exchange shall be effected by the Trustee) or
(iii) there shall have occurred and be continuing an Event of Default with
respect to the Securities.

     (c)  If any Global Security is to be exchanged for other Securities or
cancelled in whole, it shall be surrendered by or on behalf of the Depositary or
its nominee to the Trustee, as Security Registrar, for exchange or cancellation
as provided in this Article Three.  If any Global Security is to be exchanged
for other Securities or cancelled in part, or if another Security is to be
exchanged in whole or in part for a beneficial interest in any Global Security,
then either (i) such Global Security shall be so surrendered for exchange or
cancellation as provided in this Article Three or (ii) the principal amount
thereof shall be reduced or increased by an amount equal to the portion thereof
to be so exchanged or cancelled, or equal to the principal amount of such other
Security to be so exchanged for a beneficial interest therein, as the case may
be, by means of an appropriate adjustment made on the records of the Trustee, as
Security Registrar, whereupon the Trustee, in accordance with the Applicable
Procedures, shall instruct the Depositary or its authorized representative to
make a corresponding adjustment to its records.  Upon any such surrender or
adjustment of a Global Security, the Trustee shall, subject to Section 306(b)
and as otherwise provided in this Article Three, authenticate and deliver any
Securities issuable in exchange for such Global Security (or any portion
thereof) to or upon the order of, and registered in such names as may be
directed by, the Depositary or its authorized representative.  Upon the request
of the Trustee in

                                      -49-
<PAGE>

connection with the occurrence of any of the events specified in the preceding
paragraph, the Issuer shall promptly make available to the Trustee a reasonable
supply of Securities that are not in the form of Global Securities. The Trustee
shall be entitled to rely upon any order, direction or request of the Depositary
or its authorized representative which is given or made pursuant to this Article
Three if such order, direction or request is given or made in accordance with
the Applicable Procedures and in accordance with all applicable laws.

     (d) Every Security authenticated and delivered upon registration of
transfer of, or in exchange for or in lieu of, a Global Security or any portion
thereof, whether pursuant to this Article Three or otherwise, shall be
authenticated and delivered in the form of, and shall be, a Global Security,
unless such Security is registered in the name of a Person other than the
Depositary for such Global Security or a nominee thereof.

     (e) The Depositary or its nominee, as registered owner of a Global
Security, shall be the Holder of such Global Security for all purposes under
this Indenture and the Securities and owners of beneficial interests in a Global
Security shall hold such interests pursuant to the Applicable Procedures.
Accordingly, any such owner's beneficial interest in a Global Security will be
shown only on, and the transfer of such interest shall be effected only through,
records maintained by the Depositary or its nominee or its Agent Members.

     SECTION 306.  Registration, Registration of Transfer and Exchange
                   ---------------------------------------------------
Generally; Restrictions on Transfer and Exchange; Securities Act Legends.
------------------------------------------------------------------------

     (a) Registration, Registration of Transfer and Exchange Generally.  The
         -------------------------------------------------------------
Issuer shall cause to be kept at the Corporate Trust Office of the Trustee a
register (the register maintained in such office and in any other office or
agency of the Issuer designated pursuant to Section 1002 being herein sometimes
collectively referred to as the "Security Register") in which, subject to such
reasonable regulations as it may prescribe, the Issuer shall provide for the
registration of Securities and of transfers and exchanges of Securities.  The
Trustee is hereby appointed "Security Registrar" for the purpose of registering
Securities and transfers and exchanges of Securities as herein provided.  Such
Security Register shall distinguish between Original Securities, Additional
Securities and Exchange Securities and between Dollar Securities and Euro
Securities.

     Subject to the other provisions of this Indenture regarding restrictions on
transfer, upon surrender for registration of transfer of any Security at an
office or agency of the Issuer designated pursuant to Section 1002 for such
purpose, the Issuer shall execute, and the Trustee or Authentication Agent shall
authenticate and deliver, in the name of the designated transferee or
transferees, one or more new Securities of any authorized denominations, of a
like currency and aggregate principal amount and bearing such restrictive
legends as may be required by this Indenture.

     At the option of the Holder, and subject to the other provisions of this
Section 306, Securities may be exchanged for other Securities of any authorized
denominations, of a like currency and

                                      -50-
<PAGE>

aggregate principal amount and bearing such restrictive legends as may be
required by this Indenture upon surrender of the Securities to be exchanged at
any such office or agency. Whenever any Securities are so surrendered for
exchange, the Issuer shall execute, and the Trustee or Authentication Agent
shall authenticate and make available for delivery, the Securities which the
Holder making the exchange is entitled to receive.

     All Securities issued upon any registration of transfer or exchange of
Securities shall be the valid obligations of the Issuer, evidencing the same
debt, and (except for the differences between Original Securities and Exchange
Securities provided for herein) entitled to the same benefits under this
Indenture, as the Securities surrendered upon such registration of transfer or
exchange.

     Every Security presented or surrendered for registration of transfer or for
exchange shall (if so required by the Issuer or the Security Registrar) be duly
endorsed, or be accompanied by a written instrument of transfer, in form
satisfactory to the Issuer and the Security Registrar, duly executed by the
Holder thereof or his attorney duly authorized in writing.

     No service charge shall be made for any registration of transfer or
exchange of Securities, but the Issuer may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
with any registration of transfer or exchange of Securities, other than
exchanges pursuant to Sections 304, 305, 306, 906, 1015, 1016 or 1108 not
involving any transfer.

     The Issuer and the Trustee shall not be required (i) to issue, register the
transfer of, or exchange any Security during a period beginning at the opening
of business 15 days before the day of the mailing of a notice of redemption of
Securities selected for redemption under Section 1104 and ending at the close of
business on the day of such mailing, or (ii) to register the transfer of or
exchange any Security so selected for redemption, in whole or in part, except
the unredeemed portion of any Security being redeemed in part.

     (b)  Certain Transfers and Exchanges.  Notwithstanding any other provision
          -------------------------------
of this Indenture or the Securities, transfers and exchanges of Securities and
beneficial interests in a Global Security of the kinds specified in this Section
306(b) shall be made only in accordance with this Section 306(b).  Transfers and
exchanges subject to this Section 306(b) shall also be subject to the other
provisions of this Indenture that are not inconsistent with this Section 306(b).

          (1) Restricted Global Security to Regulation S Global Security.  If
              ----------------------------------------------------------
the owner of a beneficial interest in the Restricted Global Security wishes at
any time to transfer such interest to a Person who is required or permitted to
acquire the same in the form of a beneficial interest in the Regulation S Global
Security, such transfer may be effected only in accordance with the provisions
of this clause (b)(1) subject to the Applicable Procedures; provided that no
transfers from a Restricted Global Security to a Regulation S Global Security
shall be permitted during the Distribution Compliance Period. Upon receipt by
the Trustee, as Security Registrar, of (A) an order given by the appropriate
Depositary or its authorized representative directing that a beneficial

                                     -51-
<PAGE>

interest in the appropriate Regulation S Global Security in a specified
principal amount be credited to a specified Agent Member's account and that a
beneficial interest in the Restricted Global Security in an equal principal
amount be debited from another specified Agent Member's account, and (B) a
Regulation S Certificate, satisfactory to the Trustee and duly executed by the
owner of such beneficial interest in the Restricted Global Security or his
attorney duly authorized in writing, then the Trustee, as Security Registrar but
subject to clause (b)(4) below, shall reduce the principal amount of the
appropriate Restricted Global Security and increase the principal amount of the
appropriate Regulation S Global Security by such specified principal amount as
provided in Section 305(c); provided that such transfers shall only occur
between or among Global Dollar Securities or between or among Global Euro
Securities.

          (2)  Regulation S Global Security to Restricted Global Security.  If
               ----------------------------------------------------------
the owner of a beneficial interest in the Regulation S Global Security wishes at
any time to transfer such interest to a Person who is required or permitted to
acquire the same in the form of a beneficial interest in the Restricted Global
Security, such transfer may be effected only in accordance with this clause
(b)(2) and subject to the Applicable Procedures. Upon receipt by the Trustee, as
Security Registrar, of (A) an order given by the Depositary or its authorized
representative directing that a beneficial interest in the Restricted Global
Security in a specified principal amount be credited to a specified Agent
Member's account and that a beneficial interest in the Regulation S Global
Security in an equal principal amount be debited from another specified Agent
Member's account and (B) if such transfer is to occur during the Distribution
Compliance Period, a Restricted Securities Certificate, satisfactory to the
Trustee and duly executed by the owner of such beneficial interest in the
Regulation S Global Security or his attorney duly authorized in writing, then
the Trustee, as Security Registrar, shall reduce the principal amount of the
Regulation S Global Security and increase the principal amount of the Restricted
Global Security by such specified principal amount as provided in Section
305(c); provided that such transfers shall only occur between or among Global
Dollar Securities or between or among Global Euro Securities.

          (3)  Exchanges between Global Security and Non-Global Security.  A
               ---------------------------------------------------------
beneficial interest in a Global Security may be exchanged for a Security that is
not a Global Security as provided in Section 305, provided that, if such
interest is a beneficial interest in a Restricted Global Security, then such
interest shall be exchanged for a Restricted Security (subject in each case to
Section 306(c)).

          (4)  Regulation S Global Dollar Security to be Held Through Euroclear
               ----------------------------------------------------------------
or Cedelbank during Distribution Compliance Period.  The Issuer shall use its
--------------------------------------------------
best efforts to cause the Depositary for the Regulation S Global Dollar Security
to ensure that beneficial interests in the Regulation S Global Dollar Security
may be held only in or through accounts maintained at the Depositary by
Euroclear or Cedelbank (or by Agent Members acting for the account thereof)
until the expiration of the Distribution Compliance Period, and no person shall
be entitled to effect any transfer or exchange that would result in any such
interest being held otherwise than in or through such an account until the
expiration of the Distribution Compliance Period; provided that this clause

                                     -52-
<PAGE>

(b)(4) shall not prohibit any transfer or exchange of such an interest in
accordance with clause (b)(2) above.

          (5)  Regulation S Global Euro Security to be Held Through Euroclear
               --------------------------------------------------------------
during Distribution Compliance Period.  The Issuer shall use its best efforts to
-------------------------------------
cause the Depositary to ensure that beneficial interests in the Regulation S
Global Euro Security may be held only in or through accounts maintained by
Euroclear (or by Agent Members acting for the account thereof) until the
expiration of the Distribution Compliance Period, and no person shall be
entitled to effect any transfer or exchange that would result in any such
interest being held otherwise than in or through such an account until the
expiration of the Distribution Compliance Period; provided that this clause
(b)(5) shall not prohibit any transfer or exchange of such an interest in
accordance with clause (b)(2) above.

     (c)  Securities Act Legends.  Rule 144A Securities and their respective
          ----------------------
Successor Securities shall bear a Restricted Securities Legend, and Regulation S
Securities and their Successor Securities shall bear a Regulation S Legend,
subject to the following:

          (1) subject to the following clauses of this Section 306(c), a
Security or any portion thereof which is exchanged, upon transfer or otherwise,
for a Global Security or any portion thereof shall bear the Securities Act
Legend borne by such Global Security while represented thereby;

          (2) subject to the following clauses of this Section 306(c), a new
Security which is not a Global Security and is issued in exchange for another
Security (including a Global Security) or any portion thereof, upon transfer or
otherwise, shall bear the Securities Act Legend borne by such other Security,
provided that, if such new Security is required pursuant to Section 306(b)(3) to
be issued in the form of a Restricted Security, it shall bear a Restricted
Securities Legend and, if such new Security is so required to be issued in the
form of a Regulation S Security, it shall bear a Regulation S Legend;

          (3) Registered Securities shall not bear a Securities Act Legend;

          (4) at any time after the Securities may be freely transferred without
registration under the Securities Act or without being subject to transfer
restrictions pursuant to the Securities Act, a new Security which does not bear
a Securities Act Legend may be issued in exchange for or in lieu of a Security
(other than a Global Security) or any portion thereof which bears such a legend
if the Trustee has received an Unrestricted Securities Certificate, satisfactory
to the Trustee and duly executed by the Holder of such legended Security or his
attorney duly authorized in writing, and after such date and receipt of such
certificate, the Trustee or Authentication Agent shall authenticate and make
available for delivery such a new Security in exchange for or in lieu of such
other Security as provided in this Article Three;

                                      -53-
<PAGE>

          (5) a new Security which does not bear a Securities Act Legend may be
issued in exchange for or in lieu of a Security (other than a Global Security)
or any portion thereof which bears such a legend if, in the Issuer's judgment,
placing such a legend upon such new Security is not necessary to ensure
compliance with the registration requirements of the Securities Act, and the
Trustee or Authentication Agent, at the direction of the Issuer, shall
authenticate and deliver such a new Security as provided in this Article Three
provided that, the Trustee, if it deems reasonably necessary or appropriate, may
request an Opinion of Counsel in connection with such direction; and

     Notwithstanding the foregoing provisions of this Section 306(c), a
Successor Security of a Security that does not bear a particular form of
Securities Act Legend shall not bear such form of legend unless the Issuer has
reasonable cause to believe that such Successor Security is a "restricted
security" within the meaning of Rule 144, in which case the Trustee or
Authentication Agent, at the direction of the Issuer, shall authenticate and
make available for delivery a new Security bearing a Restricted Securities
Legend in exchange for such Successor Security as provided in this Article
Three.

     Each Holder of a Security agrees to indemnify the Trustee and
Authentication Agent against any liability that may result from the transfer,
exchange or assignment of such Holder's Security in violation of any provision
of this Indenture and/or applicable United States federal or state securities
law.

     The Trustee and the Authentication Agent shall have no obligation or duty
to monitor, determine or inquire as to compliance with any restrictions on
transfer imposed under this Indenture or under applicable law with respect to
any transfer of any interest in any Security (including any transfers between or
among Depositary participants or beneficial owners of interests in any Global
Security) other than to require delivery of such certificates and other
documentation or evidence as are expressly required by, and to do so if and when
expressly required by the terms of, this Indenture, and to examine the same to
determine substantial compliance as to form with the express requirements
hereof.

     SECTION 307.  Mutilated, Destroyed, Lost and Stolen Securities.  If any
                   ------------------------------------------------
mutilated Security is surrendered to the Trustee, the Issuer shall execute and
the Trustee or Authentication Agent shall authenticate and make available for
delivery in exchange therefor a new Security of like tenor, currency and
principal amount and bearing a number not contemporaneously outstanding.

     If there shall be delivered to the Issuer and the Trustee (i) evidence to
its satisfaction of the destruction, loss or theft of any Security and (ii) such
security or indemnity as may be required by either of them to save each of them
and any agent of either of them completely harmless, then, in the absence of
notice to the Issuer or the Trustee that such Security has been acquired by a
bona fide purchaser, the Issuer shall execute and upon its written request the
Trustee or Authentication Agent shall authenticate and make available for
delivery, in lieu of any such destroyed, lost or stolen Security, a new Security
of like tenor, currency and principal amount and bearing a number not
contemporaneously outstanding.

                                      -54-
<PAGE>

     In case any such mutilated, destroyed, lost or stolen Security has become
or is about to become due and payable, the Issuer in its discretion may, instead
of issuing a new Security, pay such Security.

     Upon the issuance of any new Security under this Section, the Issuer and
the Trustee (without duplication) may require the payment of a sum sufficient to
cover any tax or other governmental charge that may be imposed in relation
thereto and any other expenses (including the fees and expenses of the Trustee
and reasonable attorneys' fees) connected therewith.

     Every new Security issued pursuant to this Section in lieu of any
mutilated, destroyed, lost or stolen Security shall constitute an original
additional contractual obligation of the Issuer, whether or not the destroyed,
lost or stolen Security shall be at any time enforceable by anyone, and shall be
entitled to all the benefits of this Indenture equally and proportionately with
any and all other Securities duly issued hereunder.

     The provisions of this Section are exclusive and shall preclude (to the
extent lawful) all other rights and remedies with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Securities.

     SECTION 308.  Payment of Interest; Interest Rights Preserved.  Interest on
                   ----------------------------------------------
any Security which is payable, and is punctually paid or duly provided for, on
any Interest Payment Date shall be paid to the Person in whose name that
Security (or one or more Predecessor Securities) is registered at the close of
business on the Regular Record Date for such interest.

     Any interest on any Security which is payable, but is not punctually paid
or duly provided for, on any Interest Payment Date (herein called "Defaulted
Interest") shall forthwith cease to be payable to the Holder on the relevant
Regular Record Date by virtue of having been such Holder on such date, and such
Defaulted Interest may be paid by the Issuer, at its election in each case, as
provided in clause (1) or (2) below:

     (1) The Issuer may elect to make payment of any Defaulted Interest to the
Persons in whose names the Securities (or its respective Predecessor Securities)
are registered at the close of business on a Special Record Date for the payment
of such Defaulted Interest, which shall be fixed in the following manner: The
Issuer shall notify the Trustee in writing of the amount of Defaulted Interest
proposed to be paid on each Security and the date of the proposed payment, and
at the same time the Issuer shall deposit with the Trustee an amount of money
equal to the aggregate amount proposed to be paid in respect of such Defaulted
Interest or shall make arrangements satisfactory to the Trustee for such deposit
prior to the date of the proposed payment, such money when deposited to be held
in trust for the benefit of the Persons entitled to such Defaulted Interest as
in this clause provided. Thereupon the Trustee shall fix a Special Record Date
for the payment of such Defaulted Interest which shall be not more than 15 days
and not less than 10 days prior to the date of the proposed payment and not less
than 10 days after the receipt by the Trustee of the notice of the proposed
payment. The Trustee shall promptly notify the Issuer of such Special Record
Date and, in

                                      -55-
<PAGE>

the name and at the sole expense of the Issuer, shall cause notice of the
proposed payment of such Defaulted Interest and the Special Record Date therefor
to be mailed, first-class postage prepaid, to each Holder at his address as it
appears in the Security Register, not less than 10 days prior to such Special
Record Date. Notice of the proposed payment of such Defaulted Interest and the
Special Record Date therefor having been so mailed, such Defaulted Interest
shall be paid to the Persons in whose names the Securities (or its respective
Predecessor Securities) are registered at the close of business on such Special
Record Date and shall no longer be payable pursuant to the following clause (2).

     (2) The Issuer may make payment of any Defaulted Interest in any other
lawful manner not inconsistent with the requirements of any securities exchange
on which the Securities may be listed, and upon such notice as may be required
by such exchange, if, after written notice given by the Issuer to the Trustee of
the proposed payment pursuant to this clause, such manner of payment shall be
deemed practicable by the Trustee in its reasonable judgment.

     Subject to the foregoing provisions of this Section, each Security
delivered under this Indenture upon registration of transfer of or in exchange
for or in lieu of any other Security shall carry the rights to interest accrued
and unpaid, and to accrue, which were carried by such other Security.

     SECTION 309.  Persons Deemed Owners.  Prior to due presentment of a
                   ---------------------
Security for registration of transfer, the Issuer, the Trustee and any agent of
the Issuer or the Trustee may treat the Person in whose name such Security is
registered as the owner of such Security for the purpose of receiving payment of
principal of (and premium, if any) and (subject to Section 308) interest on such
Security and for all other purposes whatsoever, whether or not such Security be
overdue, and neither the Issuer, the Trustee nor any agent of the Issuer or the
Trustee shall be affected by notice to the contrary.

     None of the Issuer, the Trustee or any agent of the Issuer or the Trustee
shall have any responsibility or liability for any aspect of the records
relating to or payments made on account of beneficial ownership interests of a
Security in global form, or for maintaining, supervising or reviewing any
records relating to such beneficial ownership interests.  Notwithstanding the
foregoing, with respect to any Security in global form, nothing herein shall
prevent the Issuer or the Trustee, or any agent of the Issuer or the Trustee,
from giving effect to any written certification, proxy or other authorization
furnished by any Depositary (or its nominee), as a Holder, with respect to such
Security in global form or impair, as between such Depositary and owners of
beneficial interests in such Security in global form, the operation of customary
practices governing the exercise of the rights of such Depositary (or its
nominee) as a Holder of such Security in global form.

     SECTION 310.  Cancellation.  All Securities surrendered for payment,
                   ------------
redemption, registration of transfer or exchange or pursuant to any Offer to
Purchase pursuant to Section 1015 or 1016 shall, if surrendered to any Person
other than the Trustee, be delivered to the Trustee and shall be promptly
canceled by it and only by it. The Issuer may at any time deliver to the Trustee
or

                                      -56-
<PAGE>

Authentication Agent, as the case may be, for cancellation any Securities
previously authenticated and delivered hereunder which the Issuer may have
acquired in any manner whatsoever, and all Securities so delivered shall be
promptly canceled by the Trustee. No Securities shall be authenticated in lieu
of or in exchange for any Securities canceled as provided in this Section,
except as expressly permitted by this Indenture. All canceled Securities held by
the Trustee shall be disposed of as directed by an Issuer order, provided, that
in no event shall the Trustee be required to destroy such canceled Securities.

     SECTION 311.  CUSIP, ISN Numbers.  The Issuer in issuing the Securities may
                   ------------------
use "CUSIP" of "ISN" numbers (if then generally in use), and, if so, the Trustee
shall use "CUSIP" or "ISN" numbers in notices as a convenience to Holders;
provided that any such notice may state that no representation is made as to the
correctness of such numbers either as printed on the Securities or as contained
in any notice and that reliance may be placed only on the other identification
numbers printed on the Securities, and any such redemption shall not be affected
by any defect in or omission of such numbers. The Issuer will promptly notify
the Trustee of any change in the "CUSIP" or "ISN" numbers.

     SECTION 312.  Computation of Interest.  Interest on the Securities shall be
                   -----------------------
computed on the basis of a 360-day year of twelve 30-day months.

                                 ARTICLE FOUR

                          Satisfaction and Discharge

     SECTION 401.  Satisfaction and Discharge of Indenture.  This Indenture
                   ---------------------------------------
shall cease to be of further effect (except as to any surviving rights of
registration of transfer or exchange of Securities herein expressly provided
for), and the Trustee, on written demand of and at the sole expense of the
Issuer, shall execute proper instruments acknowledging satisfaction and
discharge of this Indenture (including, but not limited to, Article Twelve
hereof), when

     (1)  either

          (A) all Securities theretofore authenticated and delivered (other than
(i) Securities which have been destroyed, lost or stolen and which have been
replaced or paid as provided in Section 307 and (ii) Securities for whose
payment money has theretofore been deposited in trust or segregated and held in
trust by the Issuer and thereafter repaid to the Issuer or discharged from such
trust, as provided in Section 1003) have been delivered to the Trustee or
Authentication Agent, as the case may be, for cancellation; or

          (B) all such Securities not theretofore delivered to the Trustee for
cancellation

              (i)  have become due and payable, or

                                      -57-
<PAGE>

               (ii)  will become due and payable at its Stated Maturity within
one year, or

               (iii) are to be called for redemption within one year under
arrangements satisfactory to the Trustee for the giving of notice of redemption
by the Trustee in the name, and at the sole expense, of the Issuer,

and the Issuer, in the case of (i), (ii) or (iii) above, has irrevocably
deposited or caused to be deposited with the Trustee as trust funds in trust for
the purpose an amount in cash or U.S. Government Securities sufficient to pay
and discharge the entire indebtedness on such Securities not theretofore
delivered to the Trustee for cancellation, for principal (and premium, if any)
and interest to the date of such deposit (in the case of Securities which have
become due and payable) or to the Stated Maturity or Redemption Date, as the
case may be including, without limitation, the payment of all fees and expenses
of the Trustee, its agents and counsel;

     (2)  the Issuer has paid or caused to be paid all other sums payable
hereunder by the Issuer including, without limitation, the payment of all fees
and expenses of the Trustee, its agents and counsel; and

     (3)  the Issuer has delivered to the Trustee an Officers' Certificate and
an Opinion of Counsel, each stating that all conditions precedent herein
provided for relating to the satisfaction and discharge of this Indenture have
been complied with.

Notwithstanding the satisfaction and discharge of this Indenture pursuant to
this Article Four, the obligations of the Issuer to the Trustee under Section
607 and, if money shall have been deposited with the Trustee pursuant to
subclause (B) of clause (i) of this Section, the obligations of the Trustee
under Section 402 and the last paragraph of Section 1003 shall survive.

     SECTION 402.  Application of Trust Money.  Subject to the provisions of the
                   --------------------------
last paragraph of Section 1003, all money deposited with the Trustee pursuant to
Section 401 shall be held in trust and applied by it, in accordance with the
provisions of the Securities and this Indenture, to the payment, either directly
or through any Paying Agent (including the Issuer acting as its own Paying
Agent) as the Trustee may determine, to the Persons entitled thereto, of the
principal (and premium, if any) and interest for whose payment such money has
been deposited with the Trustee.

                                 ARTICLE FIVE

                                   Remedies

     SECTION 501.  Events of Default.  "Event of Default", wherever used herein,
                   -----------------
means any one of the following events (whatever the reason for such Event of
Default and whether it shall be voluntary or involuntary or be effected by
operation of law or pursuant to any judgment, decree or

                                      -58-
<PAGE>

order of any court or any order, rule or regulation of any administrative or
governmental body) (a "Default" as such term is used in this Indenture shall
mean the occurrence and continuation of an Event of Default):

     (1) failure to pay principal of (or premium, if any, on) any Security when
due (upon acceleration, optional or mandatory redemption, required repurchase or
otherwise);

     (2) failure to pay interest on any Security when due, and such default
continues for a period of 30 days;

     (3) default in the payment of principal and interest on Securities required
to be purchased pursuant to an Offer to Purchase pursuant to Sections 1015 or
1016 when due and payable;

     (4) failure to perform or comply with the provisions contained in Article
Eight;

     (5) failure to perform any other covenant or agreement of the Issuer under
the Indenture or the Securities and such failure continues for 60 days after
written notice to the Issuer by the Trustee or Holders of at least 25% in
aggregate principal amount of outstanding Securities;

     (6) (i) any default by the Issuer or any Material Restricted Subsidiary in
the payment of the principal, premium, if any, or interest has occurred with
respect to amounts in excess of $10.0 million under any agreement, indenture or
instrument evidencing Debt when the same shall become due and payable in full
and such default shall have continued after any applicable grace period and
shall not have been cured or waived and, if not already matured at its final
maturity in accordance with its terms, the holders of such Debt shall have the
right to accelerate such Debt, or (ii) any event of default as defined in any
agreement, indenture or instrument of the Issuer or any Restricted Subsidiary
evidencing Debt in excess of $10.0 million shall have occurred and the Debt
thereunder, if not already matured at its final maturity in accordance with its
terms, shall have been accelerated;

     (7) the rendering of a final judgment or judgments against the Issuer or
any Material Restricted Subsidiary in an amount in excess of $10.0 million which
remains undischarged or unstayed for a period of 60 days after the date on which
the right to appeal has expired;

     (8) the entry by a court having jurisdiction in the premises of (A) a
decree or order for relief in respect of the Issuer or any Material Restricted
Subsidiary in an involuntary case or proceeding under any applicable U.S.
Federal or State or other applicable bankruptcy, insolvency, reorganization or
other similar law or (B) a decree or order adjudging the Issuer or any Material
Restricted Subsidiary a bankrupt or insolvent, or approving as properly filed a
petition seeking reorganization, arrangement, adjustment or composition of or in
respect of the Issuer or any Material Restricted Subsidiary under any applicable
U.S. Federal or State, or other applicable law, or appointing a custodian,
receiver, liquidator, assignee, trustee, sequestrator or other similar official
of the Issuer or any Material Restricted Subsidiary or of any substantial part
of the property of the Issuer or any Material Restricted Subsidiary, or ordering
the winding up or liquidation of the affairs of the Issuer or any Material
Restricted Subsidiary, and the continuance of any such decree or order

                                     -59-
<PAGE>

for relief or any such other decree or order unstayed and in effect for a period
of 60 consecutive days; or

     (9) the commencement by the Issuer or any Material Restricted Subsidiary of
a voluntary case or proceeding under any applicable U.S. Federal or State, or
other applicable bankruptcy, insolvency, reorganization or other similar law or
of any other case or proceeding to be adjudicated a bankrupt or insolvent, or
the consent by the Issuer or any Material Restricted Subsidiary to the entry of
a decree or order for relief in respect of the Issuer or such Material
Restricted Subsidiary in an involuntary case or proceeding under any applicable
U.S. Federal or State, or other applicable bankruptcy, insolvency,
reorganization or other similar law or to the commencement of any bankruptcy or
insolvency case or proceeding against the Issuer or a Material Restricted
Subsidiary, or the filing by the Issuer or any Material Restricted Subsidiary of
a petition or answer or consent seeking reorganization or relief under any
applicable U.S. Federal or State, or other applicable law, or the consent by the
Issuer or any Material Restricted Subsidiary to the filing of such petition or
to the appointment of or taking possession by a custodian, receiver, liquidator,
assignee, trustee, sequestrator or similar official of the Issuer or any
Material Restricted Subsidiary or of substantially all of the property of the
Issuer or any Material Restricted Subsidiary, or the making by the Issuer or any
Material Restricted Subsidiary of an assignment for the benefit of creditors, or
the admission by the Issuer or any Material Restricted Subsidiary in writing of
its inability to pay its debts generally as they become due, or the taking of
corporate action by the Issuer or any Material Restricted Subsidiary in
furtherance of any such action.

     SECTION 502.  Acceleration of Maturity; Rescission and Annulment.  If an
                   --------------------------------------------------
Event of Default (other than an Event of Default specified in Section 501(8) or
(9)) occurs and is continuing, then and in every such case the Trustee or the
Holders of not less than 25% in principal amount of the Outstanding Securities
may declare the Securities to be due and payable immediately, by a notice in
writing to the Issuer (and to the Trustee if given by Holders), and upon any
such declaration the principal and any accrued interest on all Outstanding
Securities shall become immediately due and payable.  If an Event of Default
specified in Section 501(8) or (9) occurs, the principal of and any accrued
interest on the Securities then Outstanding shall ipso facto become immediately
due and payable without any declaration or other Act on the part of the Trustee
or any Holder.

     At any time after such a declaration of acceleration has been made and
before a judgment or decree for payment of the money due has been obtained by
the Trustee as hereinafter in this Article provided, the Holders of a majority
in principal amount of the Outstanding Securities, by written notice to the
Issuer and the Trustee, may rescind and annul such declaration and its
consequences if

     (1) the Issuer has paid or deposited with the Trustee a sum sufficient to
pay

         (A) the principal of (and premium, if any, on) any Securities which
have become due otherwise than by such declaration of acceleration (including
any Securities required to have been purchased on the Purchase Date pursuant to
an Offer to Purchase made by the Issuer) and, to

                                      -60-
<PAGE>

the extent that payment of such interest is lawful, any interest thereon at the
rate provided therefor in the Securities,

          (B) to the extent that payment of such interest is lawful, interest
upon overdue interest at the rate provided therefor in the Securities, and

          (C) all sums paid or advanced by the Trustee hereunder and the
reasonable compensation, expenses, disbursements and advances of the Trustee,
its agents and counsel; and

     (2)  all Events of Default, other than the non-payment of the principal of
(and premium, if any) or interest on, the Securities which have become due
solely by such declaration of acceleration, have been cured or waived as
provided in Section 513.

No such rescission shall affect any subsequent default or impair any right
consequent thereon.

     SECTION 503.  Collection of Indebtedness and Suits for Enforcement by
                   -------------------------------------------------------
Trustee.  The Issuer covenants that if
-------

     (1)  default is made in the payment of any interest on any Security when
such interest becomes due and payable and such default continues for a period of
30 days, or

     (2)  default is made in the payment of the principal of (or premium, if
any, on) any Security at the Maturity thereof or, with respect to any Security
required to have been purchased pursuant to an Offer to Purchase made by the
Issuer, at the Purchase Date thereof, the Issuer will, upon demand of the
Trustee, pay to it, for the benefit of the Holders of such Securities, the whole
amount then due and payable on such Securities for principal (and premium, if
any) and interest, and, to the extent that payment of such interest shall be
legally enforceable, interest on any overdue principal (and premium, if any) and
on any overdue interest, at the rate provided therefor in the Securities, and,
in addition thereto, such further amount as shall be sufficient to cover the
costs and expenses of collection, including the reasonable compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel and
any amounts due the Trustee under Section 607 hereof.

     If the Issuer fails to pay such amounts forthwith upon such demand, the
Trustee, in its own name and as trustee of an express trust, may institute a
judicial proceeding for the collection of the sums so due and unpaid, may
prosecute such proceeding to judgment or final decree and may enforce the same
against the Issuer or any other obligor upon the Securities and collect the
moneys adjudged or decreed to be payable in the manner provided by law out of
the property of the Issuer or any other obligor upon the Securities, wherever
situated.

     If an Event of Default occurs and is continuing, the Trustee may in its
discretion proceed to protect and enforce its rights and the rights of the
Holders by such appropriate judicial proceedings as the Trustee shall deem most
effectual to protect and enforce any such rights, whether for the

                                      -61-
<PAGE>

specific enforcement of any covenant or agreement in this Indenture or in aid of
the exercise of any power granted herein, or to enforce any other proper remedy.

     SECTION 504.  Trustee May File Proofs of Claim.  In case of any judicial
                   --------------------------------
proceeding relative to the Issuer or any other obligor upon the Securities, or
its property or its creditors, the Trustee shall be entitled and empowered, by
intervention in such proceeding or otherwise, to take any and all actions
authorized under the Trust Indenture Act in order to have claims of the Holders
and the Trustee allowed in any such proceeding.  In particular, the Trustee
shall be authorized to collect, receive and distribute any moneys or other
property payable or deliverable on any such claims and to distribute the same;
and any custodian, receiver, assignee, trustee, liquidator, sequestrator or
other similar official in any such judicial proceeding is hereby authorized by
each Holder to make such payments to the Trustee and, in the event that the
Trustee shall consent to the making of such payments directly to the Holders, to
pay to the Trustee any amount due it for the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel, and any other
amounts due the Trustee under Section 607.

     No provision of this Indenture shall be deemed to authorize the Trustee to
authorize or consent to or accept or adopt on behalf of any Holder any plan of
reorganization, arrangement, adjustment or composition affecting the Securities
or the rights of any Holder thereof or to authorize the Trustee to vote in
respect of the claim of any Holder in any such proceeding.

     SECTION 505.  Trustee May Enforce Claims Without Possession of Securities.
                   -----------------------------------------------------------
All rights of action and claims under this Indenture or the Securities may be
prosecuted and enforced by the Trustee without the possession of any of the
Securities or the production thereof in any proceeding relating thereto, and any
such proceeding instituted by the Trustee shall be brought in its own name as
trustee of an express trust, and any recovery of judgment shall, after provision
for the payment of the reasonable compensation, expenses, disbursements and
advances of the Trustee, its agents and counsel, and any amounts due the Trustee
under Section 607 hereof, be for the ratable benefit of the Holders of the
Securities in respect of which such judgment has been recovered.

     SECTION 506.  Application of Money Collected.  Subject to Article Thirteen,
                   ------------------------------
any money collected by the Trustee pursuant to this Article shall be applied in
the following order, at the date or dates fixed by the Trustee and, in case of
the distribution of such money on account of principal (or premium, if any) or
interest, upon presentation of the Securities and the notation thereon of the
payment if only partially paid and upon surrender thereof if fully paid:

     FIRST:  To the payment of all amounts (including, without limitation, the
reasonable compensation, expenses, disbursements and advances due the Trustee,
its agents and counsel and any other amounts) due the Trustee under Section 607;
and

     SECOND:  To the payment of the amounts then due and unpaid for principal of
(and premium, if any) and interest on the Securities due the Holders in respect
of which or for the benefit of which such money has been collected, ratably,
without preference or priority of any kind,

                                      -62-
<PAGE>

according to the amounts due and payable on such Securities for principal (and
premium, if any) and interest, respectively.

     SECTION 507.  Limitation on Suits.  No Holder of any Security shall have
                   -------------------
any right to institute any proceeding, judicial or otherwise, with respect to
this Indenture, or for the appointment of a receiver or trustee, or for any
other remedy hereunder, unless

     (1) such Holder has previously given written notice to the Trustee of a
continuing Event of Default;

     (2) the Holders of not less than 25% in principal amount of the Outstanding
Securities shall have made written request to the Trustee to institute
proceedings or pursue remedies in respect of such Event of Default in its own
name as Trustee hereunder;

     (3) such Holder or Holders have offered and provided to the Trustee
reasonable indemnity satisfactory to the Trustee against the costs, expenses and
liabilities to be incurred in compliance with such request;

     (4) the Trustee for 60 days after its receipt of such notice, request and
offer of indemnity has failed to institute any such proceeding or pursued any
remedies; and

     (5) no direction which is inconsistent with such written request has been
given to the Trustee during such 60-day period by the Holders of a majority in
principal amount of the Outstanding Securities;

it being understood and intended that no one or more Holders shall have any
right in any manner whatever by virtue of, or by availing of, any provision of
this Indenture to affect, disturb or prejudice the rights of any other Holders,
or to obtain or to seek to obtain priority or preference over any other Holders
or to enforce any right under this Indenture, except in the manner herein
provided and for the equal and ratable benefit of all the Holders.

     SECTION 508.  Unconditional Right of Holders to Receive Principal, Premium
                   ------------------------------------------------------------
and Interest.  Notwithstanding any other provision in this Indenture, the Holder
------------
of any Security shall have the right, which is absolute and unconditional, to
receive payment of the principal of (and premium, if any) and (subject to
Section 308) interest on such Security on the respective Stated Maturities
expressed in such Security (or, in the case of redemption, on the Redemption
Date or in the case of an Offer to Purchase made by the Issuer and required to
be accepted as to such Security, on the Purchase Date) and to institute suit for
the enforcement of any such payment, and such rights shall not be impaired or
affected without the consent of such Holder.

     SECTION 509.  Restoration of Rights and Remedies.  If the Trustee or any
                   ----------------------------------
Holder has instituted any proceeding to enforce any right or remedy under this
Indenture and such proceeding has been discontinued or abandoned for any reason,
or has been determined adversely to the Trustee

                                      -63-
<PAGE>

or to such Holder, then and in every such case, subject to any determination in
such proceeding, the Issuer, the Trustee and the Holders shall be restored
severally and respectively to their former positions hereunder and thereafter
all rights and remedies of the Trustee and the Holders shall continue as though
no such proceeding had been instituted.

     SECTION 510.  Rights and Remedies Cumulative.  Except as otherwise provided
                   ------------------------------
with respect to the replacement or payment of mutilated, destroyed, lost or
stolen Securities in the last paragraph of Section 307, no right or remedy
herein conferred upon or reserved to the Trustee or to the Holders is intended
to be exclusive of any other right or remedy, and every right and remedy shall,
to the extent permitted by law, be cumulative and in addition to every other
right and remedy given hereunder or now or hereafter existing at law or in
equity or otherwise.  The assertion or employment of any right or remedy
hereunder, or otherwise, shall not prevent the concurrent assertion or
employment of any other appropriate right or remedy.

     SECTION 511.  Delay or Omission Not Waiver.  No delay or omission of the
                   ----------------------------
Trustee or of any Holder of any Security to exercise any right or remedy
accruing upon any Event of Default shall impair any such right or remedy or
constitute a waiver of any such Event of Default or an acquiescence therein.
Every right and remedy given by this Article or by law to the Trustee or to the
Holders may be exercised from time to time, and as often as may be deemed
expedient, by the Trustee or by the Holders, as the case may be.

     SECTION 512.  Control by Holders.  The Holders of a majority in principal
                   ------------------
amount of the Outstanding Securities shall have the right to direct the time,
method and place of conducting any proceeding for any remedy available to the
Trustee or exercising any trust or power conferred on the Trustee, provided that

     (1)  the Trustee may refuse to follow any direction which

          (i)  conflicts with any rule of law or with this Indenture,

               or

          (ii) the Trustee, in its reasonable judgment, determines may be unduly
prejudicial to the rights of other Holders of Securities, or may expose the
Trustee to personal liability, or does not provide adequate indemnification
against any loss or expense resulting from the compliance therewith, and

     (2)  the Trustee may take any other action deemed proper by the Trustee
which is not inconsistent with such direction.

     SECTION 513.  Waiver of Past Defaults.  The Holders of not less than a
                   -----------------------
majority in principal amount of the Outstanding Securities may on behalf of the
Holders of all the Securities, by written notice to the Trustee, waive any past
default hereunder and its consequences, except a default

                                      -64-
<PAGE>

     (1) in the payment of the principal of (or premium, if any) or interest on
any Security (including any Security which is required to have been purchased
pursuant to an Offer to Purchase which has been made by the Issuer), or

     (2) in respect of a covenant or provision hereof which under Article Nine
cannot be modified or amended without the consent of the Holder of each
Outstanding Security affected.

     Upon any such waiver, such default shall be cured and shall cease to exist,
and any Event of Default arising therefrom shall be deemed to have been cured,
for every purpose of this Indenture; but no such waiver shall extend to any
subsequent or other default or impair any right consequent thereon.

     SECTION 514.  Undertaking for Costs.  In any suit for the enforcement of
                   ---------------------
any right or remedy under this Indenture, or in any suit against the Trustee for
any action taken, suffered or omitted by it as Trustee, a court may require any
party litigant in such suit to file an undertaking to pay the reasonable costs
of such suit, and may assess reasonable costs against any such party litigant,
in the manner and to the extent provided in the Trust Indenture Act; provided,
that this Section shall not be deemed to authorize any court to require such an
undertaking or to make such an assessment in any suit instituted by the Trustee
and provided, further that, subject to a court's discretion, this Section shall
not apply to a suit by the Trustee, and as provided in the Trust Indenture Act.

     SECTION 515.  Waiver of Stay, or Extension Laws.  The Issuer covenants (to
                   ---------------------------------
the extent that they may lawfully do so) that they will not at any time insist
upon, or plead, or in any manner whatsoever claim or take the benefit or
advantage of, any stay or extension law wherever enacted, now or at any time
hereafter in force, which may affect the covenants or the performance of this
Indenture; and the Issuer (to the extent that they may lawfully do so) hereby
expressly waives all benefit or advantage of any such law and covenants that
they will not hinder, delay or impede the execution of any power herein granted
to the Trustee, but will suffer and permit the execution of every such power as
though no such law had been enacted.

                                  ARTICLE SIX

                                  The Trustee

     SECTION 601.  Certain Duties and Responsibilities.
                   -----------------------------------

     (a) If an Event of Default has occurred and is continuing, the Trustee
shall exercise such of the rights and powers vested in it by this Indenture, and
use the same degree of care and skill in its exercise, as a prudent person would
exercise or use under the circumstances in the conduct of his own affairs.

                                      -65-
<PAGE>

     (b)  Except during the continuance of an Event of Default:

          (1) the duties of the Trustee shall be determined solely by the
express provisions of this Indenture and the Trustee need perform only those
duties that are specifically set forth in this Indenture and no others, and no
implied covenants or obligations shall be read into this Indenture against the
Trustee, and

          (2) in the absence of bad faith on its part, the Trustee may
conclusively rely, as to the truth of the statements and the correctness of the
opinions expressed therein, upon certificates or opinions furnished to the
Trustee and conforming to the requirements of this Indenture. However, the
Trustee shall examine the certificates and opinions to determine whether or not
they conform to the requirements of this Indenture (but need not confirm or
investigate the accuracy of mathematical calculations or other facts stated
therein).

     (c)  The Trustee may not be relieved from liabilities for its own negligent
action, its own negligent failure to act, or its own willful misconduct, except
that:

          (1) this paragraph does not limit the effect of paragraph (b) of this
Section;

          (2) the Trustee shall not be liable for any error of judgment made in
good faith by a Responsible Officer, unless it is proved that the Trustee was
negligent in ascertaining the pertinent facts;

          (3) the Trustee shall not be liable with respect to any action it
takes or omits to take in good faith in accordance with a direction received by
it pursuant to Section 512 hereof; and

          (4) no provision of this Indenture shall require the Trustee to expend
or risk its own funds or otherwise incur any financial liability in the
performance of any of its duties hereunder, or in the exercise of any of its
rights or powers, if it shall have reasonable grounds for believing that
repayment of such funds or adequate indemnity against such risk or liability is
not reasonably assured to it.

     (d)  Whether or not therein expressly so provided, every provision of this
Indenture that in any way relates to the Trustee is subject to paragraphs (a),
(b), and (c) of this Section.  All indemnifications and releases from liability
granted hereunder to the Trustee shall extend to its officers, directors,
employees, agents, successors and assigns and to it in its roles hereunder as
Paying Agent, Tender Agent, Authenticating Agent and Securities Registrar.

     SECTION 602.  Notice of Defaults.  The Trustee shall give the Holders
                   ------------------
notice of any default  hereunder (a "Notice of Default") of which it has
knowledge as and to the extent provided by the Trust Indenture Act; provided,
however, that in the case of any default specified in Section 501(5), no such
notice to Holders shall be given until at least 30 days after the occurrence of
such default

                                      -66-
<PAGE>

(without regard to any Notice of Default). For the purpose of this Section, the
term "default" means any event which is, or after notice or lapse of time or
both would become, an Event of Default.

     Except in the case of an Event of Default in payment of principal of
(premium, if any) or interest on any Security, the Trustee may withhold notice
if and so long as a committee of its Responsible Officers in good faith
determines that withholding the notice is in the interests of the Holders.

     SECTION 603.  Certain Rights of Trustee.  Subject to the provisions of
                   -------------------------
Section 601:

     (a) the Trustee may conclusively rely and shall be protected in acting or
refraining from acting upon any resolution, certificate, statement, instrument,
opinion, report, notice, request, direction, consent, order, bond, debenture,
note, other evidence of indebtedness or other paper or document believed by it
to be genuine and to have been signed or presented by the proper party or
parties, without any independent investigation of any fact or matter therein;

     (b) any request or direction of the Issuer mentioned herein shall be
sufficiently evidenced by an Issuer request or Issuer Order and any resolution
of the Board of Directors may be sufficiently evidenced by a Board Resolution;

     (c) whenever in the administration of this Indenture the Trustee shall deem
it desirable that a matter be proved or established prior to taking, suffering
or omitting any action hereunder, the Trustee (unless other evidence be herein
specifically prescribed) may, in the absence of bad faith on its part, request
and rely upon an Officers' Certificate;

     (d) the Trustee may consult with counsel of its selection and the advice of
such counsel or any Opinion of Counsel, shall be full and complete authorization
and protection in respect of any action taken, suffered or omitted by it
hereunder in good faith and in reliance thereon;

     (e) the Trustee shall be under no obligation to exercise any of the rights
or powers vested in it by this Indenture at the request or direction of any of
the Holders pursuant to this Indenture, unless such Holders shall have offered
to the Trustee reasonable security or indemnity satisfactory to the Trustee
against the costs, expenses and liabilities which might be incurred by it in
compliance with such request or direction;

     (f) the Trustee shall not be bound to make any investigation into the facts
or matters stated in any resolution, certificate, statement, instrument,
opinion, report, notice, request, direction, consent, order, bond, debenture,
note, other evidence of indebtedness or other paper or document, but the
Trustee, in its discretion, may make such further inquiry or investigation into
such facts or matters as it may see fit, and, if the Trustee shall determine to
make such further inquiry or investigation, it shall be entitled to examine the
books, records and premises of the Issuer, personally or by agent or attorney
upon reasonable advance notice to the Issuer;

                                      -67-
<PAGE>

     (g) the Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed with due care by it
hereunder;

     (h) the Trustee shall not be liable for any action it takes, suffers to be
taken, or omits in good faith; and

     (i) the Trustee shall not be deemed to have notice of any Default or Event
of Default unless a Responsible Officer of the Trustee has actual knowledge
thereof or unless written notice of any event which is in fact such a default is
received by the Trustee at the Corporate Trust Office of the Trustee, and such
notice references the Securities or this Indenture.

     SECTION 604.  Not Responsible for Recitals or Issuance of Securities.  The
                   ------------------------------------------------------
recitals contained herein and in the Securities, except the certificates of
authentication, shall be taken as the statements of the Issuer, and the Trustee
assumes no responsibility for its correctness.  The Trustee makes no
representations as to the validity or sufficiency of this Indenture or of the
Securities.  The Trustee shall not be accountable for the use or application by
the Issuer of Securities or the proceeds thereof.

     SECTION 605.  May Hold Securities; Act as Trustee under Other Indentures.
                   ----------------------------------------------------------
The Trustee, any Authenticating Agent, any Paying Agent, any Security Registrar
or any other agent of the Issuer, in its individual or any other capacity, may
become the owner or pledgee of Securities and, subject to Sections 608 and 613,
may otherwise deal with the Issuer and any other obligor upon the Securities
with the same rights it would have if it were not Trustee, Authenticating Agent,
Paying Agent, Security Registrar or such other agent.

     The Trustee is hereby authorized to act as trustee under that certain
indenture between the Issuer and the Trustee, dated as of July 1, 1998 (the
"1998 Senior Indenture"), that certain Indenture dated as of March 1, 1999 (the
"Old Subordinated Indenture"), and that certain Indenture dated as of the date
hereof relating to Convertible Subordinated Notes due July 15, 20008 (the "New
Subordinated Indenture" and collectively with the 1998 Senior Indenture and the
Old Subordinated Indenture, the "Prior Indentures") notwithstanding any
provisions of this Indenture or the Prior Indentures affecting the relative
rights of holders of securities issued under such indentures to payment thereon
and to security given to secure such payment. The Trustee may become and act as
trustee under other indentures under which other securities, or certificates of
interest or participation in other securities, of the Company are outstanding in
the same manner as if it were not Trustee hereunder. The Trustee is authorized
to resign from any of its appointments as Trustee hereunder, as trustee under
any of the Prior Indentures, or as trustee under any other indenture in the
event that the Trustee determines in good faith that its performance hereunder
or thereunder subjects the Trustee to a conflict of interest.

     SECTION 606.  Money Held in Trust.  Money held by the Trustee in trust
                   -------------------
hereunder need not be segregated from other funds except to the extent required
by law.  The Trustee shall be under

                                      -68-
<PAGE>

no liability for interest on any money received by it hereunder except as
otherwise agreed in writing with the Issuer.

     SECTION 607.  Compensation and Reimbursement.  The Issuer agrees
                   ------------------------------

     (1) to pay to the Trustee from time to time such reasonable compensation
for all services rendered by it hereunder as may be agreed in writing from time
to time (which compensation shall not be limited by any provision of law in
regard to the compensation of a trustee of an express trust);

     (2) except as otherwise expressly provided herein, to reimburse the Trustee
upon its request for all reasonable expenses, disbursements and advances
incurred or made by the Trustee in accordance with any provision of this
Indenture (including the reasonable compensation and the compensation, expenses
and disbursements of its agents, accountants, experts and counsel), except any
such expense, disbursement or advance as may be attributable to its negligence
or bad faith; and

     (3) to indemnify the Trustee and any predecessor Trustee and their agents
for, and to hold them harmless against, any loss, damage, claims, liability or
expense (including, without limitation, reasonable attorneys' fees and expenses
and taxes (other than taxes based upon, measured by or determined by the income
of such Person) incurred without negligence or bad faith on its part, arising
out of or in connection with the acceptance or administration of this trust,
including the costs and expenses of defending itself against any claim or
liability (not arising from negligence or bad faith) in connection with the
exercise or performance of any of its powers or duties hereunder.

     The Trustee shall notify the Issuer promptly upon acquiring knowledge of
any claim for which it is entitled to be indemnified hereunder.  Failure by the
Trustee to so notify the Issuer shall not relieve the Issuer of its obligations
hereunder unless the Issuer are prejudiced thereby.  If the Issuer elect to
defend the claim, the Issuer shall be entitled to control the defense of such
claim and the Trustee shall cooperate in such defense.  The Trustee may have
separate counsel, and the Issuer shall pay the reasonable fees and expenses of
such counsel until such time as the Issuer assumes the defense of such claim,
and thereafter, to the extent that in the Trustee's reasonable judgment its
interests conflict with or differ from those of the Issuer under such claim.
The Issuer need not pay for any settlement made without its consent, which
consent shall not be unreasonably withheld.

     The Trustee shall have a lien prior to the Securities as to all property
and funds held by it hereunder for any amount owing it or any predecessor
Trustee pursuant to this Section 607, except with respect to funds held in trust
for the benefit of the Holders of particular Securities.

     The obligations of the Issuer under this Section 607 shall survive the
resignation or removal of the Trustee and/or satisfaction and discharge of this
Indenture.

     When the Trustee incurs expenses or renders services after an Event of
Default specified in Section 501(9) or (10) hereof occurs, the expenses and the
compensation for the services (including

                                      -69-
<PAGE>

the fees and expenses of its agents and counsel) are intended to constitute
expenses of administration under any applicable bankruptcy law.

     SECTION 608.  Disqualification; Conflicting Interests.  If the Trustee has
                   ---------------------------------------
or shall acquire a conflicting interest within the meaning of the Trust
Indenture Act, the Trustee shall either eliminate such interest within 90 days,
apply to the Commission for permission to continue, or resign, to the extent and
in the manner provided by, and subject to the provisions of, the Trust Indenture
Act and this Indenture.

     SECTION 609.  Corporate Trustee Required; Eligibility.  There shall at all
                   ---------------------------------------
times be a Trustee hereunder which shall be a Person that is eligible pursuant
to the Trust Indenture Act to act as such and has (or, in the case of a
corporation included in a bank holding company system, the related bank holding
company has) a combined capital and surplus of at least $50.0 million and its
Corporate Trust Office or agency in The Borough of Manhattan, City of New York.
If such Person or bank holding company publishes reports of condition at least
annually, pursuant to law or to the requirements of said supervising or
examining authority, then for the purposes of this Section, the combined capital
and surplus of such Person or bank holding company shall be deemed to be its
combined capital and surplus as set forth in its most recent report of condition
so published.  If at any time the Trustee shall cease to be eligible in
accordance with the provisions of this Section, it shall resign immediately in
the manner and with the effect hereinafter specified in this Article.

     SECTION 610.  Resignation and Removal; Appointment of Successor.
                   -------------------------------------------------

     (a)  No resignation or removal of the Trustee and no appointment of a
successor Trustee pursuant to this Article shall become effective until the
acceptance of appointment by the successor Trustee under Section 611.

     (b)  The Trustee may resign at any time by giving written notice thereof to
the Issuer.

     (c)  The Trustee may be removed at any time by Act of the Holders of a
majority in principal amount of the Outstanding Securities, delivered to the
Trustee and to the Issuer.

     (d)  If at any time:

          (1) the Trustee shall fail to comply with Section 608 after written
request therefor by the Issuer or by any Holder who has been a bona fide Holder
of a Security for at least six months, or

          (2) the Trustee shall cease to be eligible under Section 609 and shall
fail to resign after written request therefor by the Issuer or by any such
Holder, or

          (3) the Trustee shall become incapable of acting or shall be adjudged
a bankrupt or insolvent or a receiver of the Trustee or of its property shall be
appointed or any public officer

                                      -70-
<PAGE>

shall take charge or control of the Trustee or of its property or affairs for
the purpose of rehabilitation, conservation or liquidation, then, in any such
case, (i) the Issuer by Board Resolutions of the Issuer may remove the Trustee,
or (ii) subject to Section 514, any Holder who has been a bona fide Holder of a
Security for at least six months may, on behalf of himself and all others
similarly situated, petition any court of competent jurisdiction for the removal
of the Trustee and the appointment of a successor Trustee.

     (e) If the Trustee shall resign, be removed or become incapable of acting,
or if a vacancy shall occur in the office of Trustee for any cause, the Issuer,
by Board Resolution of the Issuer, shall promptly appoint a successor Trustee.
If, within one year after such resignation, removal or incapability, or the
occurrence of such vacancy, a successor Trustee shall be appointed by Act of the
Holders of a majority in principal amount of the Outstanding Securities
delivered to the Issuer and the retiring Trustee, the successor Trustee so
appointed shall, forthwith upon its acceptance of such appointment, become the
successor Trustee and supersede the successor Trustee appointed by the Issuer.
If, within 30 days after the retiring Trustee resigns, no successor Trustee
shall have been so appointed by the Issuer or the Holders of a majority in
principal amount of the Outstanding Securities and accepted appointment in the
manner hereinafter provided, the retiring Trustee or any Holder who has been a
bona fide Holder of a Security for at least six months may, on behalf of himself
and all others similarly situated, petition any court of competent jurisdiction
for the appointment of a successor Trustee.

     (f) The Issuer shall give notice of each resignation and each removal of
the Trustee and each appointment of a successor Trustee to all Holders in the
manner provided in Section 106. Each notice shall include the name of the
successor Trustee and the address of its Corporate Trust Office.

     SECTION 611.  Acceptance of Appointment by Successor.  Every successor
                   --------------------------------------
Trustee appointed hereunder shall execute, acknowledge and deliver to the Issuer
and to the retiring Trustee a written instrument accepting such appointment, and
thereupon the resignation or removal of the retiring Trustee shall become
effective and such successor Trustee, without any further act, deed or
conveyance, shall become vested with all the rights, powers, trusts and duties
of the retiring Trustee; but, on request of the Issuer or the successor Trustee,
such retiring Trustee shall, upon payment of all sums owing to the retiring
Trustee hereunder and subject to the Lien provided for in Section 607 hereof,
execute and deliver an instrument transferring to such successor Trustee all the
rights, powers and trusts of the retiring Trustee and shall duly assign,
transfer and deliver to such successor Trustee all property and money held by
such retiring Trustee hereunder.  Upon request of any such successor Trustee,
the Issuer shall execute any and all instruments for more fully and certainly
vesting in and confirming to such successor Trustee all such rights, powers and
trusts.  Notwithstanding the replacement of the Trustee pursuant to this Section
611, the Issuer's obligations under Section 607 hereof shall continue for the
benefit of the retiring Trustee.

     No successor Trustee shall accept its appointment unless at the time of
such acceptance such successor Trustee shall be qualified and eligible under
this Article.

                                      -71-
<PAGE>

     SECTION 612.  Merger, Conversion, Consolidation or Succession to Business.
                   -----------------------------------------------------------
Any corporation into which the Trustee may be merged or converted or with which
it may be consolidated, or any corporation resulting from any merger, conversion
or consolidation to which the Trustee shall be a party, or any corporation
succeeding to all or substantially all the corporate trust business of the
Trustee, shall be the successor of the Trustee hereunder, provided such
corporation shall be otherwise qualified and eligible under this Article,
without the execution or filing of any paper or any further act on the part of
any of the parties hereto. In case any Securities shall have been authenticated,
but not delivered, by the Trustee then in office, any successor by merger,
conversion or consolidation to such authenticating Trustee, or any corporation
into which all or substantially all of its corporate trust business is
transferred, may adopt such authentication and deliver the Securities so
authenticated with the same effect as if such successor Trustee had itself
authenticated such Securities.

     SECTION 613.  Preferential Collection of Claims Against Issuer.  If and
                   ------------------------------------------------
when the Trustee shall be or become a creditor of the Issuer (or any other
obligor upon the Securities), the Trustee shall be subject to the provisions of
the Trust Indenture Act regarding the collection of claims against the Issuer(or
any such other obligor).

     SECTION 614.  Appointment of Authenticating Agent.  The Trustee may appoint
                   -----------------------------------
an Authenticating Agent or Agents which shall be authorized to act on behalf of
the Trustee to authenticate Securities issued upon original issue and upon
exchange, registration of transfer, partial conversion or partial redemption or
pursuant to Section 307, and Securities so authenticated shall be entitled to
the benefits of this Indenture and shall be valid and obligatory for all
purposes as if authenticated by the Trustee hereunder.  Wherever reference is
made in this Indenture to the authentication and delivery of Securities by the
Trustee or the Trustee's certificate of authentication, such reference shall be
deemed to include authentication and delivery on behalf of the Trustee by an
Authenticating Agent and a certificate of authentication executed on behalf of
the Trustee by an Authenticating Agent. Each Authenticating Agent shall be
reasonably acceptable to the Issuer.  If such Authenticating Agent or bank
holding company publishes reports of condition at least annually, pursuant to
law or to the requirements of said supervising or examining authority, then for
the purposes of this Section, the combined capital and surplus of such
Authenticating Agent or bank holding company shall be deemed to be its combined
capital and surplus as set forth in its most recent report of condition so
published.  If at any time an Authenticating Agent shall cease to be eligible in
accordance with the provisions of this Section, such Authenticating Agent shall
resign immediately in the manner and with the effect specified in this Section.

     The Trustee hereby appoints the Euro Agent as Authentication Agent for
purposes of authenticating any Euro Securities.

     Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or
corporate trust business of an Authenticating Agent, shall continue to be an

                                      -72-
<PAGE>

Authenticating Agent, provided such corporation shall be otherwise eligible
under this Section, without the execution or filing of any paper or any further
act on the part of the Trustee or the Authenticating Agent.

     An Authenticating Agent may resign at any time by giving written notice
thereof to the Trustee and to the Issuer.  The Trustee may at any time terminate
the agency of an Authenticating Agent by giving written notice thereof to such
Authenticating Agent and to the Issuer.  Upon receiving such a notice of
resignation or upon such a termination, or in case at any time such
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section, the Trustee may appoint a successor Authenticating
Agent which shall be reasonably acceptable to the Issuer and shall mail written
notice of such appointment by first-class mail, postage prepaid, to all Holders
as its names and addresses appear in the Security Register.  Any successor
Authenticating Agent upon acceptance of its appointment hereunder shall become
vested with all the rights, powers and duties of its predecessor hereunder, with
like effect as if originally named as an Authenticating Agent.  No successor
Authenticating Agent shall be appointed unless eligible under the provisions of
this Section.

     The Trustee agrees to pay to each Authenticating Agent from time to time
reasonable compensation for its services under this Section, and the Trustee
shall be entitled to be reimbursed for such payments from the Issuer, subject to
the provisions of Section 607.

     If an appointment is made pursuant to this Section, the Securities may have
endorsed thereon, in addition to the Trustee's certificate of authentication, an
alternative certificate of authentication in the following form:

     This is one of the Securities described in the within-mentioned Indenture.

                         [NAME OF AUTHENTICATING AGENT]

                         By___________________________
                           Authorized Signatory

                                 ARTICLE SEVEN

               Holders' Lists and Reports by Trustee and Issuer

     SECTION 701.  Issuer to Furnish Trustee Names and Addresses of Holders.
                   --------------------------------------------------------
The Issuer will furnish or cause to be furnished to the Trustee

                                      -73-
<PAGE>

     (a) semi-annually, not more than 15 days after each June 1 and December 1,
commencing June 1, 2000, a list, in such form as the Trustee may reasonably
require, of the names and addresses of the Holders as of such Regular Record
Date, and

     (b) at such other times as the Trustee may request in writing, within 30
days after the receipt by the Issuer of any such request, a list of similar form
and content as of a date not more than 15 days prior to the time such list is
furnished;

excluding from any such list names and addresses received by the Trustee in its
capacity as Security Registrar.

     SECTION 702.  Preservation of Information; Communications to Holders.
                   ------------------------------------------------------

     (a) The Trustee shall preserve, in as current a form as is reasonably
practicable, the names and addresses of Holders contained in the most recent
list furnished to the Trustee as provided in Section 701 and the names and
addresses of Holders received by the Trustee in its capacity as Security
Registrar. The Trustee may destroy any list furnished to it as provided in
Section 701 upon receipt of a new list so furnished.

     (b) The rights of Holders to communicate with other Holders with respect to
its rights under this Indenture or under the Securities and the corresponding
rights and duties of the Trustee shall be provided by the Trust Indenture Act.

     (c) Every Holder of Securities, by receiving and holding the same, agrees
with the Issuer and the Trustee that neither the Issuer nor the Trustee nor any
agent of either of them shall be held accountable by reason of any disclosure of
information as to the names and addresses of Holders made pursuant to the Trust
Indenture Act.

     SECTION 703.  Reports by Trustee.
                   ------------------

     (a) The Trustee shall mail or transmit to Holders such reports concerning
the Trustee and its actions under this Indenture as may be required pursuant to
the Trust Indenture Act at the times and in the manner provided pursuant
thereto.

     (b) A copy of each such report shall, at the time of such mailing or
transmission to Holders, be filed by the Trustee with each stock exchange upon
which the Securities are listed, if any, with the Commission and with the
Issuer. The Issuer will notify the Trustee when the Securities are listed on any
stock exchange, or any delisting thereof.

     SECTION 704.  Reports by the Issuer.  The Issuer shall file with the
                   ---------------------
Trustee and the Commission, and mail or transmit to Holders, such information,
documents and other reports, and such summaries thereof, as may be required
pursuant to the Trust Indenture Act at the times and in the manner provided
pursuant to, the Trust Indenture Act; provided that any such information,

                                      -74-
<PAGE>

documents or reports required to be filed with the Commission pursuant to
Section 13 or 15(d) of the Exchange Act shall be filed with the Trustee within
15 days after the same is so required to be filed with the Commission.  Delivery
of such reports, information and documents to the Trustee is for informational
purposes only and the Trustee's receipt of such shall not constitute
constructive notice of any information contained therein or determinable from
information contained therein, including the Issuer's compliance with any of its
covenants hereunder (as to which the Trustee is entitled to rely exclusively on
Officers' Certificates and written notices delivered to the Trustee in
accordance with the terms of this Indenture).

                                 ARTICLE EIGHT

             Consolidation, Merger, Conveyance, Transfer or Lease

     SECTION 801.  Issuer may Consolidate, Etc. Only on Certain Terms.  The
                   --------------------------------------------------
Issuer may not, in a single transaction or a series of related transactions, (i)
consolidate or merge with or into any other Person or permit any other Person to
consolidate or merge with or into the Issuer or (ii) directly or indirectly,
transfer, sell, lease or otherwise dispose of all or substantially all of its
assets, unless:

          (1) in a transaction in which the Issuer does not survive or in which
the Issuer transfers, sells, leases or otherwise disposes of all or
substantially all of its assets, the successor entity to the Issuer (for
purposes of this Article Eight, a "Successor Entity"), shall be organized and
validly existing under the laws of the United States of America, any State
thereof, or the District of Columbia, and shall expressly assume by an indenture
supplemental hereto executed and delivered to the Trustee, in form satisfactory
to the Trustee, all of the Issuer's obligations under the Indenture;

          (2) immediately before and after giving effect to such transaction and
treating any Debt which becomes an obligation of the Issuer or a Restricted
Subsidiary as a result of such transaction as having been Incurred by the Issuer
or such Restricted Subsidiary at the time of the transaction, no Event of
Default or event that with the passing of time or the giving of notice, or both,
would constitute an Event of Default shall have occurred and be continuing;

          (3) except in the case of any such consolidation or merger of the
Issuer with or into, or any such transfer, sale, lease or other disposition of
assets to, a Wholly Owned Restricted Subsidiary, immediately after giving effect
to such transaction, the Consolidated Net Worth of the Issuer (or other
successor entity to the Issuer) is equal to or greater than that of the Issuer
immediately prior to the transaction;

          (4) except in the case of any such consolidation or merger of the
Issuer with or into, or any such transfer, sale, lease or other disposition of
assets to, a Wholly Owned Restricted Subsidiary, immediately after giving effect
to such transaction and treating any Debt which becomes an obligation of the
Issuer or a Restricted Subsidiary as a result of such transaction as having been
Incurred by the Issuer or such Restricted Subsidiary at the time of the
transaction, the Issuer

                                      -75-
<PAGE>

(including any successor entity to the Issuer) could Incur at least $1.00 of
additional Debt pursuant to the provisions of the Indenture described in the
first paragraph of Section 1008; and

          (5) the Issuer has delivered to the Trustee an Officer's Certificate
and an Opinion of Counsel, each stating that such amalgamation, consolidation,
merger, conveyance, transfer, sale, lease or disposition and, if a supplemental
indenture is required in connection with such transaction, such supplemental
indenture, complies with this Article and that all conditions precedent herein
provided for relating to such transaction have been complied with, and, with
respect to such Officer's Certificate, setting forth the manner of determination
of the Consolidated Net Worth and the ability to Incur Debt in accordance with
clauses (3) and (4) of this Section 801, of the Issuer or, if applicable, of the
Successor Entity as required pursuant to the foregoing.

     SECTION 802.  Successor Substituted.  Upon any consolidation of the Issuer
                   ---------------------
with, or merger of the Issuer into, any other Person or any transfer,
conveyance, sale, lease or other disposition of all or substantially all of the
properties and assets of the Issuer as an entirety in accordance with Section
801, the Successor Entity shall succeed to, and be substituted for, and may
exercise every right and power of, the Issuer under this Indenture with the same
effect as if such successor Person had been named herein as the Issuer herein,
and thereafter, except in the case of a lease, the predecessor Person shall be
relieved of all obligations and covenants under this Indenture and the
Securities.

                                 ARTICLE NINE

                            Supplemental Indentures

     SECTION 901.  Supplemental Indentures Without Consent of Holders.  Without
                   --------------------------------------------------
the consent of any Holders, the Issuer, when authorized by a Board Resolution,
and the Trustee, at any time and from time to time, may enter into one or more
indentures supplemental hereto, in form satisfactory to the Trustee, for any of
the following purposes:

     (1) to evidence the succession of another Person to an Issuer and the
assumption by any such successor of the covenants of the Issuer herein and in
the Securities; or

     (2) to add to the covenants of the Issuer for the benefit of the Holders,
or to surrender any right or power herein conferred upon the Issuer; or

     (3) to secure the Securities pursuant to the requirements of Section 1013
or otherwise; or

     (4) to comply with any requirements of the Commission in order to effect
and maintain the qualification of this Indenture under the Trust Indenture Act;
or

     (5) to cure any ambiguity, to correct or supplement any provision herein
which may be inconsistent with any other provision herein, or to make any other
provisions with respect to matters

                                      -76-
<PAGE>

or questions arising under this Indenture which shall not be inconsistent with
the provisions of this Indenture, provided that such action pursuant to this
clause (5) shall not adversely affect the interests of the Holders in any
material respect;

     (6) to evidence and provide for the acceptance and appointment hereunder of
a successor Trustee with respect to the Securities; or

     (7) to comply with any of the requirements of the Luxembourg Stock Exchange
in connection with listing the Euro Securities thereon.

     SECTION 902.  Supplemental Indentures with Consent of Holders.  With the
                   -----------------------------------------------
consent of the Holders of not less than a majority in principal amount of the
Outstanding Securities, by Act of said Holders delivered to the Issuer and the
Trustee, the Issuer, when authorized by Board Resolutions of the Issuer, and the
Trustee may enter into an indenture or indentures supplemental hereto for the
purpose of adding any provisions to or changing in any manner or eliminating any
of the provisions of this Indenture or of modifying in any manner the rights of
the Holders under this Indenture; provided, however, that no such supplemental
indenture shall, without the consent of the Holder of each Outstanding Security
affected thereby,

     (1) change the Stated Maturity of the principal of, or any installment of
interest on, any Security, or reduce the principal amount thereof or the rate of
interest thereon or any premium payable thereon, or change the place of payment
where, or the coin or currency in which, any Security or any premium or the
interest thereon is payable, or impair the right to institute suit for the
enforcement of any such payment on or after the Stated Maturity thereof (or, in
the case of redemption, on or after the Redemption Date or, in the case of an
Offer to Purchase which has been made, on or after the applicable Purchase
Date), or

     (2) reduce the percentage in principal amount of the Outstanding
Securities, the consent of whose Holders is required for any such supplemental
indenture, or the consent of whose Holders is required for any waiver (of
compliance with certain provisions of this Indenture or certain defaults
hereunder and its consequences) provided for in this Indenture, or

     (3) modify any of the provisions of this Section, Section 513 or Section
1021, except to increase any such percentage or to provide that certain other
provisions of this Indenture cannot be modified or waived without the consent of
the Holder of each Outstanding Security affected thereby, or

     (4) following the mailing of an Offer with respect to an Offer to Purchase
pursuant to Section 1015 or 1016, modify the provisions of this Indenture with
respect to such Offer to Purchase in a manner adverse to such Holder.

                                      -77-
<PAGE>

     It shall not be necessary for any Act of Holders under this Section to
approve the particular form of any proposed supplemental indenture, but it shall
be sufficient if such Act shall approve the substance thereof.

     SECTION 903.  Execution of Supplemental Indentures.  In executing, or
                   ------------------------------------
accepting the additional trusts created by, any supplemental indenture permitted
by this Article or the modifications thereby of the trusts created by this
Indenture, the Trustee shall be entitled to receive, and (subject to Section
601) shall be fully protected in relying upon, an Opinion of Counsel stating
that the execution of such supplemental indenture is authorized or permitted by
this Indenture. The Trustee may, but shall not be obligated to, enter into any
such supplemental indenture which affects the Trustee's own rights, duties or
immunities under this Indenture or otherwise.

     SECTION 904.  Effect of Supplemental Indentures.  Upon the execution of any
                   ---------------------------------
supplemental indenture under this Article, this Indenture shall be modified in
accordance therewith, and such supplemental indenture shall form a part of this
Indenture for all purposes; and every Holder of Securities theretofore or
thereafter authenticated and delivered hereunder shall be bound thereby.

     SECTION 905.  Conformity with Trust Indenture Act.  Every supplemental
                   -----------------------------------
indenture executed pursuant to this Article shall conform to the requirements of
the Trust Indenture Act.

     SECTION 906.  Reference in Securities to Supplemental Indentures.
                   --------------------------------------------------
Securities authenticated and delivered after the execution of any supplemental
indenture pursuant to this Article may, and shall if required by the Trustee,
bear a notation in form approved by the Trustee as to any matter provided for in
such supplemental indenture. If the Issuer shall so determine, new Securities so
modified as to conform, in the opinion of the Trustee and the Issuer, to any
such supplemental indenture may be prepared and executed by the Issuer and
authenticated and delivered by the Trustee or Authentication Agent in exchange
for Outstanding Securities.

                                  ARTICLE TEN

                                   Covenants

     SECTION 1001. Payment of Principal, Premium and Interest.  The Issuer will
                   ------------------------------------------
duly and punctually pay the principal of (and premium, if any) and interest on
the Securities in accordance with the terms of the Securities and this
Indenture.

     SECTION 1002. Maintenance of Office or Agency.  The Issuer will maintain
                   -------------------------------
in the Borough of Manhattan, The City of New York, an office or agency where
Securities may be presented or surrendered for payment, where Securities may be
surrendered for registration of transfer or exchange and where notices and
demands to or upon the Issuer in respect of the Securities and this Indenture
may be served. The Issuer will give prompt written notice to the Trustee of the
location, and any change in the location, of such office or agency. If at any
time the Issuer shall fail to

                                      -78-
<PAGE>

maintain any such required office or agency or shall fail to furnish the Trustee
with the address thereof, such presentations, surrenders, notices and demands
may be made or served at the Corporate Trust Office of the Trustee, and the
Issuer hereby appoints the Trustee as its agent to receive all such
presentations, surrenders, notices and demands.

     The Issuer may also from time to time designate one or more other offices
or agencies (in or outside the Borough of Manhattan, The City of New York) where
the Securities may be presented or surrendered for any or all such purposes and
may from time to time rescind such designations; provided, however, that no such
designation or rescission shall in any manner relieve the Issuer of its
obligation to maintain an office or agency in the Borough of Manhattan, The City
of New York, for such purposes.  The Issuer will give prompt written notice to
the Trustee of any such designation or rescission and of any change in the
location of any such other office or agency.

     SECTION 1003. Money for Security Payments to Be Held in Trust.  If the
                   -----------------------------------------------
Issuer shall at any time act as its own Paying Agent, it will, on or before each
due date of the principal of (and premium, if any) or interest on any of the
Securities, segregate and hold in trust for the benefit of the Persons entitled
thereto a sum sufficient to pay the principal (and premium, if any) or interest
so becoming due until such sums shall be paid to such Persons or otherwise
disposed of as herein provided and will promptly notify the Trustee of its
action or failure so to act.

     Whenever the Issuer shall have one or more Paying Agents, it will, on or
before each due date of the principal of (and premium, if any) or interest on
any Securities, deposit with a Paying Agent a sum sufficient to pay the
principal (and premium, if any) or interest so becoming due, such sum to be held
as provided by the Trust Indenture Act, and (unless such Paying Agent is the
Trustee) the Issuer will promptly notify the Trustee of its action or failure so
to act.

     The Issuer will cause each Paying Agent other than the Trustee to execute
and deliver to the Trustee an instrument in which such Paying Agent shall agree
with the Trustee, subject to the provisions of this Section, that such Paying
Agent will (i) comply with the provisions of the Trust Indenture Act applicable
to it as a Paying Agent (or, until such time as this Indenture shall be
qualified under the Trust Indenture Act, which would be applicable to it as
Paying Agent if this Indenture were so qualified) and (ii) in the event and
during the continuance of any default by the Issuer (or any other obligor upon
the Securities) in the making of any payment in respect of the Securities, upon
the written request of the Trustee, forthwith pay to the Trustee all sums held
in trust by such Paying Agent as such.

     The Issuer may at any time, for the purpose of obtaining the satisfaction
and discharge of this Indenture or for any other purpose, pay, or by Issuer
Order direct any Paying Agent to pay, to the Trustee all sums held in trust by
the Issuer or such Paying Agent, such sums to be held by the Trustee upon the
same trusts as those upon which such sums were held by the Issuer or such Paying
Agent; and, upon such payment by any Paying Agent to the Trustee, such Paying
Agent shall be released from all further liability with respect to such money.

                                      -79-
<PAGE>

     Any money deposited with the Trustee or any Paying Agent, or then held by
the Issuer, in trust for the payment of the principal of (and premium, if any)
or interest on any Security and remaining unclaimed for two years after such
principal (and premium, if any) or interest has become due and payable shall be
paid to the Issuer on Issuer request, or (if then held by the Issuer) shall be
discharged from such trust; and the Holder of such Security shall thereafter, as
an unsecured general creditor, look only to the Issuer for payment thereof, and
all liability of the Trustee or such Paying Agent with respect to such trust
money, and all liability of the Issuer trustee thereof, shall thereupon cease;
provided, however, that the Trustee or such Paying Agent, before being required
to make any such repayment, may at the expense of the Issuer cause to be
published once, in a newspaper published in the English language, customarily
published on each Business Day and of general circulation in The City of New
York and Luxembourg, notice that such money remains unclaimed and that, after a
date specified therein, which shall not be less than 30 days from the date of
such publication, any unclaimed balance of such money then remaining will be
repaid to the Issuer.

     SECTION 1004.  Existence.  Subject to Article Eight and Section 1015, the
                    ---------
Issuer will do or cause to be done all things necessary to preserve and keep in
full force and effect its existence, rights (charter and statutory) and
franchises; provided, however, that Issuer shall not be required to preserve any
such right or franchise if the Issuer in good faith shall determine that the
preservation thereof is no longer desirable in the conduct of the business of
the Issuer and that the loss thereof is not disadvantageous in any material
respect to the Holders.

     SECTION 1005.  Maintenance of Properties.  The Issuer will cause all
                    -------------------------
material properties used or useful in the conduct of its business or the
business of any Restricted Subsidiary of the Issuer to be maintained and kept in
good condition, repair and working order (reasonable wear and tear excepted) and
supplied with all necessary equipment and will cause to be made all necessary
repairs, renewals, replacements, betterments and improvements thereof, all as in
the judgment of the Issuer may be necessary so that the business carried on in
connection therewith may be properly conducted at all times; provided, however,
that nothing in this Section shall prevent an Issuer or any of its Restricted
Subsidiaries from discontinuing the operation or maintenance of any of such
properties if such discontinuance is, as determined by the Issuer or Restricted
Subsidiary in good faith, desirable in (or not adverse to) the conduct of its
business or the business of any Restricted Subsidiary and not adverse in any
material respect to the Holders.

     SECTION 1006.  Payment of Taxes and Other Claims.  The Issuer will pay or
                    ---------------------------------
discharge or cause to be paid or discharged, before the same shall become
delinquent, (1) all material taxes, assessments and governmental charges levied
or imposed upon the Issuer or any of its Restricted Subsidiaries or upon the
income, profits or property of the Issuer or any of its Restricted Subsidiaries,
and (2) all material lawful claims for labor, materials and supplies which, if
unpaid, might by law become a lien upon the property of the Issuer or any of its
Restricted Subsidiaries; provided, however, that the Issuer shall not be
required to pay or discharge or cause to be paid or discharged any such tax,
assessment, charge or claim whose amount, applicability or validity is being
contested in good faith by appropriate negotiations or proceedings.

                                      -80-
<PAGE>

     SECTION 1007.  Maintenance of Insurance.  The Issuer shall, and the Issuer
                    ------------------------
shall cause its Restricted Subsidiaries to, keep at all times all of its
properties which are of an insurable nature insured (which may include self-
insurance) against loss or damage with insurers believed by the Issuer to be
responsible to the extent that property of similar character is usually so
insured by corporations similarly situated and owning like properties in
accordance with good business practice.

     SECTION 1008.  Limitation on Debt.  The Issuer will not, and will not
                    ------------------
permit any of its Restricted Subsidiaries to, Incur any Debt; provided that the
Issuer may Incur Debt if, after giving effect to the incurrence of such Debt and
the receipt and application of the proceeds therefrom, the Consolidated Debt to
EBITDA Ratio would be greater than zero and less than 6:1.

     Notwithstanding the foregoing limitation, the following Debt may be
Incurred, each item to be given independent effect:

          (1)  Permitted Senior Bank Debt;

          (2)  Debt owed (A) to the Issuer evidenced by a promissory note, or
(B) to any Restricted Subsidiary; provided that any event which results in any
such Restricted Subsidiary ceasing to be a Restricted Subsidiary or any
subsequent transfer of such Debt (other than to the Issuer or another Restricted
Subsidiary) shall be deemed, in each case, to constitute the Incurrence of such
Debt not permitted by this clause (2);

          (3)  Debt of the Issuer or any Restricted Subsidiary (A) in respect of
performance, surety or appeal bonds or letters of credit in the ordinary course
of business, (B) under Permitted Interest Rate or Currency Protection
Agreements, or (C) arising under, or arising from, agreements providing for
indemnification, adjustment of purchase price or similar obligations, or from
Guarantees or letters of credit, surety bonds or performance bonds securing any
obligations of the Issuer Incurred in connection with the disposition of any
business, assets (other than Guarantees of Debt Incurred by any Person acquiring
all or any portion of such business, assets or Restricted Subsidiary for the
purpose of financing such acquisition), in a principal amount not to exceed the
gross proceeds actually received by the Issuer or any Restricted Subsidiary in
connection with such disposition;

          (4)  Debt which is exchanged for or the proceeds of which are used to
refinance or refund, or any extension or renewal of (each a "refinancing"), (a)
the Securities, (b) Debt incurred pursuant to clauses (3), (5), (6), (8) and (9)
of this paragraph and this clause (4), in each case in an aggregate principal
amount not to exceed the principal amount of the Debt so refinanced (together
with any accrued interest and any premium and other payment required to be made
with respect to the Debt being refinanced or refunded, and any fees, costs,
expenses, underwriting discounts or commissions and other payments paid or
payable with respect to the Debt incurred pursuant to this clause (4));
provided, however, that (A) Debt, the proceeds of which are used to refinance
the Securities, or Debt which is pari passu with or subordinate in right of
payment to the Securities, shall only be permitted if (x) in the case of any
refinancing of the Securities or Debt which is pari passu to

                                      -81-
<PAGE>

the Securities, the refinancing Debt is Incurred by the Issuer and made pari
passu to the Securities or subordinated to the Securities, and (y) in the case
of any refinancing of Debt which is subordinated to the Securities, the
refinancing Debt is Incurred by the Issuer and is subordinated to the Securities
in a manner that is at least as favorable to the Holders as that of the Debt
refinanced; (B) the refinancing Debt by its terms, or by the terms of any
agreement or instrument pursuant to which such Debt is issued, does not have a
final maturity prior to the final maturity of the Debt being refinanced and has
an Average Life longer than the Average Life of the Debt being refinanced; and
(C) in the case of any refinancing of Debt Incurred by the Issuer, the
refinancing of Debt may be Incurred only by the Issuer, and in the case of any
refinancing of Debt Incurred by a Restricted Subsidiary, the refinancing Debt
may be Incurred only by such Restricted Subsidiary or the Issuer;

          (5)  Acquisition Debt of the Issuer or any Restricted Subsidiary;

          (6)  Exchange Securities and Additional Securities;

          (7)  Debt of the Issuer not to exceed, at any time outstanding, two
times the Net Cash Proceeds received by the Issuer after the Closing Date from
the issuance and sale of its Capital Stock (other than Disqualified Stock) to a
Person that is not a Subsidiary of the Issuer, to the extent that such Net Cash
Proceeds have not been used pursuant to clause (C)(3) of the first paragraph or
clauses (iii), (iv) or (vii) of the second paragraph of Section 1011 to make a
Restricted Payment; provided that such Debt does not have a final maturity prior
to the final maturity of the Securities and has an Average Life longer than the
Average Life of the Securities;

          (8)  Existing Debt of the Issuer;

          (9)  Debt of the Issuer or any Restricted Subsidiary Incurred to
finance the purchase or other acquisition of any property, inventory, asset or
business directly or indirectly, by the Issuer or any Restricted Subsidiary used
in, or to be used in, the System and Network Management Business;

          (10) Subordinated Debt of the Issuer not to exceed $300.0 million in
principal outstanding at any time; provided that the calculation of the
principal amount of such Subordinated Debt shall exclude the principal amount of
the New Convertible Notes; and

          (11) other Debt of the Issuer or any Restricted Subsidiary not to
exceed $50.0 million at any one time outstanding.

     For purposes of determining compliance with this Section 1008, in the event
that an item of Debt meets the criteria of more than one of the types of Debt
described in the above clauses, or is permitted in part under the first
paragraph of this Section 1008 and in part under one or more of the above
clauses, the Issuer, in its sole discretion, shall classify, and from time to
time may reclassify, such item of Debt.

                                      -82-
<PAGE>

     For purposes of determining any particular amount of Debt under Section
1008, Guarantees, Liens or obligations with respect to letters of credit
supporting Debt otherwise included in the determination of such particular
amount shall not be included.

     SECTION 1009. Limitation on Sale-Leaseback Transactions.  The Issuer will
                   -----------------------------------------
not, and will not permit any Restricted Subsidiary to, enter into any sale-
leaseback transaction involving any of its assets or properties, whether now
owned or hereafter acquired, whereby the Issuer or a Restricted Subsidiary sells
or transfers such assets or properties and then or thereafter leases such assets
or properties or any part thereof or any other assets or properties that the
Issuer or such Restricted Subsidiary, as the case may be, intends to use for
substantially the same purpose or purposes as the assets or properties sold or
transferred.

     The foregoing restriction does not apply to any sale-leaseback transaction
if (i) the lease is for a period, including renewal rights, of not in excess of
three years; (ii) the sale-leaseback transaction is consummated within 180 days
after the purchase of the assets subject to such transaction; (iii) the
transaction is solely between the Issuer and any Wholly Owned Restricted
Subsidiary or solely between Wholly Owned Restricted Subsidiaries; or (iv) the
Issuer or such Restricted Subsidiary, within 12 months after the sale or
transfer of any assets or properties is completed, applies an amount no less
than the Net Cash Proceeds received from such sale in accordance with clause (A)
or (B) of the second paragraph of Section 1015(1).

     SECTION 1010. Limitation on Guarantees of Issuer Debt by Restricted
                   -----------------------------------------------------
Subsidiaries. The Issuer may not permit any Restricted Subsidiary, directly or
------------
indirectly, to Guarantee, assume or in any other manner become liable for the
payment of any Debt of the Issuer (other than Debt of the Issuer Incurred
pursuant to clauses (1), (3), (5), (9) or (11) of the second paragraph of
Section 1008 or refinanced pursuant to clause (4) of the second paragraph of
Section 1008 of Debt originally incurred under clause (3), (5) or (9) of the
second paragraph of Section 1008) that is pari passu with or subordinate in
right of payment to the Securities unless: (i) (A) such Restricted Subsidiary
simultaneously executes and delivers a supplemental indenture providing for a
Guarantee of payment of the Securities by such Restricted Subsidiary; and (B)
with respect to any Guarantee of Debt of the Issuer that is subordinate in right
of payment to the Securities, such Guarantee shall be subordinated to such
Restricted Subsidiary's Guarantee with respect to the Securities at least to the
same extent as such Debt is subordinated to the Securities, and (ii) such
Restricted Subsidiary waives, and will not in any manner whatsoever claim or
take the benefit or advantage of, any rights of reimbursement, indemnity or
subrogation or any other rights against the Issuer or any other Restricted
Subsidiary as a result of any payment by such Restricted Subsidiary under its
Guarantee until the Securities have been paid in full.

     Notwithstanding the foregoing, any Guarantee by a Restricted Subsidiary may
provide by its terms that it shall be automatically and unconditionally released
and discharged upon (i) any sale, exchange or transfer, to any Person not an
Affiliate of the Issuer, of all of the Issuers and each Restricted Subsidiary's
Capital Stock in, or all or substantially all of the assets of, such Restricted
Subsidiary (which sale, exchange or transfer is not prohibited by this
Indenture) or (ii) the release or

                                      -83-
<PAGE>

discharge of the Guarantee which resulted in the creation of such Restricted
Subsidiary's Guarantee with respect to the Securities, except a discharge or
release by or as a result of payment under such Guarantee.

     SECTION 1011.  Limitation on Restricted Payments.  The Issuer will not, and
                    ---------------------------------
will not permit any Restricted Subsidiary directly or indirectly to:

          (1) declare or pay any dividend or make any distribution on or with
respect to its Capital Stock to Persons other than the Issuer or any of its
Restricted Subsidiaries, (other than (x) dividends or distributions payable
solely in shares of its Capital Stock (other than Disqualified Stock), or in
options, warrants or other rights to acquire shares of such Capital Stock; (y)
pro rata dividends or distributions on Common Stock of Restricted Subsidiaries
held by minority stockholders; or (z) dividends in respect of Disqualified
Stock);

          (2) purchase, redeem, retire or otherwise acquire for value any shares
of Capital Stock of (A) the Issuer or an Unrestricted Subsidiary (including
options, warrants or other rights to acquire such shares of Capital Stock) held
by any Person, or (B) a Restricted Subsidiary (including options, warrants or
other rights to acquire such shares of Capital Stock) held by any Person other
than the Issuer or a Wholly Owned Restricted Subsidiary of the Issuer;

          (3) make any voluntary or optional principal payment, or voluntary or
optional redemption, repurchase, defeasance, or other acquisition or retirement
for value, of Debt of the Issuer that is subordinated in right of payment to the
Securities; or

          (4) make any Investment, other than a Permitted Investment, in any
Person,

(such payments or any other actions described in clauses (1) through (4) above
being collectively "Restricted Payments") if, at the time of, and after giving
effect to, the proposed Restricted Payment:

              (A) a Default or Event of Default shall have occurred and be
continuing;

              (B) the Issuer could not Incur at least $1.00 of Debt under the
first paragraph of Section 1008; or

              (C) the aggregate amount of all Restricted Payments (the amount,
if other than in cash, to be determined in good faith by the Board of Directors,
whose determination shall be conclusive and evidenced by a Board Resolution)
made after the Closing Date shall exceed the sum of: (1) cumulative Consolidated
EBITDA since the date of original issuance of the Securities through the last
day of the last full fiscal quarter ending immediately preceding the date of
such Restricted Payment for which quarterly or annual financial statements are
available; minus (2) 1.5 times cumulative Consolidated Interest Expense of the
Issuer since the date of original issuance of the Securities through the last
day of the last full fiscal quarter ending immediately preceding the date of
such Restricted Payment for which quarterly or annual financial statements are
available, plus (3) the

                                      -84-
<PAGE>

aggregate Net Cash Proceeds received by the Issuer after the Closing Date from
the issuance and sale permitted by this Indenture of its Capital Stock (other
than Disqualified Stock) to a Person who is not a Subsidiary of the Issuer,
including an issuance or sale permitted by this Indenture of Debt of the Issuer
for cash subsequent to the Closing Date upon the conversion of such Debt into
Capital Stock (other than Disqualified Stock) of the Issuer, or from the
issuance to a Person who is not a Subsidiary of the Issuer of any options,
warrants or other rights to acquire Capital Stock of the Issuer (in each case,
exclusive of any Disqualified Stock or any options, warrants or other rights
that are redeemable at the option of the holder, or are required to be redeemed,
prior to the stated final maturity date of the Securities), in each case except
to the extent such Net Cash Proceeds are used to Incur Debt pursuant to clause
(vii) of the second paragraph of Section 1008, plus (4) an amount equal to the
net reduction in Investments (other than reductions in Permitted Investments) in
any Person resulting from payments of interest on Debt, dividends, repayments of
loans or advances, or other transfers of assets, in each case to the Issuer or
any Restricted Subsidiary or from the Net Cash Proceeds from the sale of any
such Investment (except, in each case, to the extent any such payment or
proceeds are included in the calculation of Consolidated EBITDA), or from
redesignations of Unrestricted Subsidiaries as Restricted Subsidiaries, not to
exceed, in each case, the amount of Investments previously made by the Issuer or
any Restricted Subsidiary in such Person or Unrestricted Subsidiary.

The foregoing provision shall not be violated by reason of:

          (i)   the payment of any dividend within 60 days after the date of
declaration thereof if, at said date of declaration, such payment would comply
with the foregoing paragraph;

          (ii)  the redemption, repurchase, defeasance or other acquisition or
retirement for value of Debt that is subordinated in right of payment to the
Securities including premium, if any, and accrued and unpaid interest, with the
proceeds of, Debt Incurred under clause (ii) of the second paragraph of Section
1008.

          (iii) the repurchase, redemption or other acquisition of Capital
Stock of the Issuer or a Subsidiary of the Issuer (or options, warrants or other
rights to acquire such Capital Stock) in exchange for (including upon exercise
of a conversion right), or out of the proceeds of a capital contribution or a
substantially concurrent offering of, shares of Capital Stock (other than
Disqualified Stock) of the Issuer (or options, warrants or other rights to
acquire such Capital Stock);

          (iv)  the making of any principal payment or the repurchase,
redemption, retirement, defeasance or other acquisition for value of Debt of the
Issuer which is subordinated in right of payment to the Securities in exchange
for, or out of the proceeds of, a capital contribution or a substantially
concurrent offering of, shares of the Capital Stock (other than Disqualified
Stock) of the Issuer (or options, warrants or other rights to acquire such
Capital Stock);

          (v)   payments or distributions, to dissenting stockholders pursuant
to applicable law, pursuant to or in connection with a consolidation, merger or
transfer of assets that complies with

                                      -85-
<PAGE>

the provisions of this Indenture applicable to mergers, consolidations and
transfers of all or substantially all of the property and assets of the Issuer,
and payments of cash in lieu of fractional shares;

          (vi)   Investments in any Person; provided that the aggregate amount
of Investments made pursuant to this clause (vi) does not exceed the sum of (a)
$50.0 million, plus (b) the amount of Net Cash Proceeds received by the Issuer
after the Closing Date from the sale of its Capital Stock (other than
Disqualified Stock) to a Person who is not a Subsidiary of the Issuer, except to
the extent such Net Cash Proceeds are used to Incur Debt pursuant to clause (7)
of the second paragraph of Section 1008 or to make Restricted Payments pursuant
to clause (C)(3) of the first paragraph, or clauses (iii) or (iv) of this
paragraph, of this Section 1011, plus (c) the net reduction in Investments made
pursuant to this clause (vi) resulting from distributions on or repayments of
such Investments or from the Net Cash Proceeds from the sale of any such
Investment (except in each case to the extent any such payment or proceeds is
included in the calculation of Consolidated EBITDA) or from such Person becoming
a Restricted Subsidiary; provided that the net reduction in any Investment shall
not exceed the amount of such Investment;

          (vii)  Investments acquired in exchange for Capital Stock (other than
Disqualified Stock) of the Issuer;

          (viii) the purchase, redemption or other acquisition or retirement of
Common Stock Of the Issuer or any option or other right to acquire shares of
Common Stock of the Issuer (I) if such Common Stock, option or other right was
issued pursuant to a plan or arrangement approved by the Issuer's Board of
Directors, and such purchase, redemption or other acquisition or retirement, (x)
occurs in accordance with the terms of such plan or arrangement, from former
employees of the Issuer and its Subsidiaries or their estates or (y) is from an
employee of the Issuer and the price paid by the Issuer to such employee is
equal to the exercise or purchase price paid by such employee and (II) from
employees of the Issuer or its Subsidiaries in an amount not to exceed $5.0
million in any fiscal year; provided that, in the case of clause (II), amounts
not paid for any such purchase, redemption or other acquisition or retirement in
any fiscal year may be accumulated and paid in any subsequent fiscal year;

          (ix)   additional Restricted Payments not to exceed $50.0 million in
the aggregate; or

          (x)    the acquisition of Capital Stock of the Issuer by the Issuer in
connection with the cashless exercise of any options, warrants or similar rights
issued by the Issuer.

     Each Restricted Payment permitted pursuant to the preceding paragraph
(other than the Restricted Payment referred to in clause (2) thereof and an
exchange of Capital Stock for Capital Stock or Debt referred to in clause (3) or
(4) thereof), and the Net Cash Proceeds from any issuance of Capital Stock
referred to in clauses (iii), (iv) and (vi), shall be included in calculating
whether the conditions of clause (C) of the first paragraph of this Section 1011
have been met with respect to any subsequent Restricted Payments.  In the event
the proceeds of an issuance of Capital Stock of the

                                      -86-
<PAGE>

Issuer are used for the redemption, repurchase or other acquisition of the
Securities, or Debt that is pari passu with the Securities, then the Net Cash
Proceeds of such issuance shall be included in clause (C) of the first paragraph
of this Section 1011 only to the extent such proceeds are not used for such
redemption, repurchase or other acquisition of Debt.

     SECTION 1012. Limitation on Dividend and Other Payment Restrictions
                   -----------------------------------------------------
Affecting Restricted Subsidiaries. The Issuer may not, and may not permit any
---------------------------------
Restricted Subsidiary to, directly or indirectly, create or otherwise cause or
suffer to exist or become effective any encumbrance or restriction on the
ability of any Restricted Subsidiary (i) to pay dividends (in cash or otherwise)
or make any other distributions in respect of its Capital Stock owned by the
Issuer or any other Restricted Subsidiary or pay any Debt or other obligation
owed to the Issuer or any other Restricted Subsidiary; (ii) to make loans or
advances to the Issuer or any other Restricted Subsidiary; or (iii) to transfer
any of its property or assets to the Issuer or any other Restricted Subsidiary.
Notwithstanding the foregoing, the Issuer may, and may permit any Restricted
Subsidiary to, suffer to exist any such encumbrance or restriction:

     (1) pursuant to any agreement in effect on the date of original issuance of
the Securities, and any amendments, extensions, refinancings, renewals or
replacements of such agreements, provided that the amendments, encumbrances and
restrictions in any such extensions, refinancings, renewals or replacements are
no less favorable in any material respect to the Holders, than those
encumbrances or restrictions that are then in effect and that are being
extended, refinanced, renewed or replaced;

     (2) existing under or by reason of applicable law;

     (3) existing in connection with any Permitted Senior Bank Debt or any Debt
incurred pursuant to clause (5) of the second paragraph of Section 1008;

     (4) pursuant to an agreement existing prior to the date on which such
Person became a Restricted Subsidiary and not Incurred in anticipation of
becoming a Restricted Subsidiary, which encumbrance or restriction is not
applicable to any Person, or the properties or assets of any Person, other than
the Person so acquired;

     (5) pursuant to an agreement entered into in connection with Debt Incurred
under clause (4) of the second paragraph of Section 1008; provided, however,
that the provisions contained in such agreement related to such encumbrance or
restriction are no more restrictive in any material respect than the provisions
contained in the agreement the subject of the refinancing such clause (4) of the
second paragraph of Section 1008;

     (6) restrictions contained in any agreement relating to a Lien of a
Restricted Subsidiary or the Issuer otherwise permitted under this Indenture,
but only to the extent such restrictions restrict the transfer of the property
subject to such Lien;

                                      -87-
<PAGE>

     (7)  customary nonassignment provisions entered into in the ordinary course
of business in leases, licenses and other contracts to the extent such
provisions restrict the transfer, sublicensing or any such license or subletting
of any such lease or the assignment of rights under any such contract;

     (8)  any restriction with respect to a Restricted Subsidiary imposed
pursuant to an agreement which has been entered into for the sale or disposition
of all or substantially all of the Capital Stock or assets of such Restricted
Subsidiary; provided that consummation of such transaction would not result in
an Event of Default or an event that, with the passing of time or the giving of
notice or both, would constitute an Event of Default, that such restriction
terminates if such transaction is closed or abandoned and that the closing or
abandonment of such transaction occurs within one year of the date such
agreement was entered into;

     (9)  any restriction imposed pursuant to contracts for the sale of assets
with respect to the transfer of the assets to be sold pursuant to such contract;

     (10) arising or agreed to in the ordinary course of business, not relating
to any Debt, and that do not, individually, or in the aggregate, detract from
the value of property or assets of the Issuer or any Restricted Subsidiary in
any manner material to the Issuer or any Restricted Subsidiary; or

     (11) such encumbrance or restriction is contained in the terms of any
agreement pursuant to which such Debt was issued if (A) the encumbrance or
restriction applies only in the event of a payment default or a default with
respect to a financial covenant contained in such Debt or agreement, (B) the
encumbrance or restriction is not materially more disadvantageous to the Holders
of the Securities than is customary in comparable financings, and (C) the Issuer
determines that any such encumbrance or restriction will not materially affect
the Issuer's ability to make principal or interest payments on the Securities.

     SECTION 1013.  Limitation on Liens. The Issuer may not, and may not permit
                    -------------------
any Restricted Subsidiary to, Incur or suffer to exist any Lien, on or with
respect to any property or assets now owned or hereafter acquired to secure any
Debt without making, or causing such Restricted Subsidiary to make, effective
provision for securing the Securities (x) equally and ratably with such Debt as
to such property or assets for so long as such Debt will be so secured or (y) in
the event such Debt is Debt of the Issuer which is subordinate in right of
payment to the Securities, prior to such Debt as to such property or assets for
so long as such Debt will be so secured.

     The foregoing restrictions shall not apply to:

          (1)  Liens in existence on the date of original issuance of the
Securities;

          (2)  Liens securing only the Securities and any Lien in favor of the
Trustee for the benefit of Holders arising under the provisions in this
Indenture;

                                      -88-
<PAGE>

          (3) Liens granted by a Restricted Subsidiay in favor of the Issuer or
any Restricted Subsidiary;

          (4) Liens to secure Permitted Senior Bank Debt;

          (5) Liens securing Purchase Money Secured Debt;

          (6) Liens on property existing immediately prior to the time of
acquisition thereof (and not Incurred in anticipation of the financing of such
acquisition);

          (7) Liens on property of a Person existing at the time such Person
becomes a Restricted Subsidiary and not incurred in anticipation of becoming a
Restricted Subsidiary;

          (8) any interest in or title of a lessor to any property subject to a
Capital Lease Obligation which is permitted under this Indenture; or

          (9) Liens to secure Debt Incurred pursuant to clause (4) of the
second paragraph of Section 1008; provided that such Lien does not extend to any
property other than the property securing the Debt being refinanced pursuant to
clause (4) of the second paragraph of Section 1008.

     SECTION 1014.  Limitation on Issuance of Capital Stock of Restricted
                    -----------------------------------------------------
Subsidiaries.  The Issuer will not sell, and will not permit any Restricted
------------
Subsidiary, directly or indirectly, to issue or sell, any shares of Capital
Stock of a Restricted Subsidiary (including options, warrants or other rights to
purchase shares of such Capital Stock) except (i) to the Issuer or a Wholly
Owned Restricted Subsidiary; (ii) issuances of director's qualifying shares or
sales to foreign nationals of shares of Capital Stock of foreign Restricted
Subsidiaries, to the extent required by applicable law; (iii) if, immediately
after giving effect to such issuance or sale, such Restricted Subsidiary would
no longer constitute a Restricted Subsidiary and any Investment in such Person
remaining after giving effect to such issuance or sale would have been permitted
under Section 1011 if made on the date of such issuance or sale; or (iv)
issuances or sales of Common Stock of a Restricted Subsidiary.

     SECTION 1015.  Asset Sales.
                    -----------

     (1)  The Issuer will not, and will not permit any Restricted Subsidiary to,
consummate an Asset Sale unless (i) the Issuer or the applicable Restricted
Subsidiary, as the case may be, receives consideration at the time of such Asset
Sale at least equal to the fair market value of the assets sold or otherwise
disposed of (as evidenced by a resolution of the Board of Directors), and (ii)
at least 75% of the consideration received by the Issuer or the Restricted
Subsidiary, as the case may be, from such Asset Sale shall be cash or other
Qualified Consideration.

     The Issuer or any Restricted Subsidiary may, within 365 days of the Asset
Sale, invest the Net Cash Proceeds thereof (A) in property or assets used, or to
be used, in the System and Network Management Business, or in a company engaged
primarily in the System and Network Management

                                      -89-
<PAGE>

Business (if and to the extent otherwise permitted under this Indenture), or (B)
to repay Secured Debt of the Issuer or any Restricted Subsidiary. The amount of
such Net Cash Proceeds not used or invested within 365 days of the Asset Sale in
the manner described in clauses (A) and (B) above shall constitute "Excess
Proceeds."

     In the event that Excess Proceeds exceed $10.0 million, the Issuer shall
make an Offer to Purchase that amount of Securities equal to the amount of
Excess Proceeds at a price equal to 100% of the principal amount of the
Securities to be purchased, plus accrued and unpaid interest and Liquidated
Damages thereon, if any, to the date of purchase and, to the extent required by
the terms thereof, any other Debt of the Issuer that is pari passu with the
Securities or Debt of a Restricted Subsidiary.  Each Offer to Purchase shall be
mailed within 30 days following the date that the Issuer shall become obligated
to purchase Securities with any Excess Proceeds.  Following the completion of an
Offer to Purchase, the amount of Excess Proceeds shall be deemed to be reset at
zero and, to the extent there are any remaining Excess Proceeds the Issuer may
use such Excess Proceeds for any use which is not otherwise prohibited by this
Indenture.

     The Issuer will comply with the requirements of Rule 14e-1 under the
Exchange Act and any other securities laws and regulations thereunder to the
extent such laws and regulations are applicable in connection with the purchase
of Securities pursuant to such Offer to Purchase.

     (2) Not later than the date of the Offer with respect to an Offer to
Purchase pursuant to this Section 1015, the Issuer shall deliver to the Trustee
an Officers' Certificate as to (i) the Purchase Amount, (ii) the allocation of
the Net Cash Proceeds from the Asset Sale(s) pursuant to which such Offer is
being made, including, if amounts are invested in assets related to the business
of the Issuers, the actual assets acquired and a statement indicating the
relationship of such assets to the business of the Issuer and (iii) the
compliance of such allocation with the provisions of Section 1015(1).

     The Issuer shall perform its obligations specified in the Offer for the
Offer to Purchase.  On or prior to the Purchase Date, the Issuer shall (i)
accept for payment (on a pro rata basis, if necessary) Securities or portions
thereof tendered pursuant to the Offer, (ii) deposit with the paying agent (or,
if the Issuer is acting as its own paying agent, segregate and hold in trust as
provided in Section 1003) money sufficient to pay the purchase price of all
Securities or portions thereof so accepted and (iii) deliver or cause to be
delivered to the Trustee all Securities so accepted together with an Officers'
Certificate stating the Securities or portions thereof accepted for payment by
the Issuers.  The Paying Agent (or the Issuers, if so acting) shall promptly
mail or deliver to Holders of Securities so accepted payment in an amount equal
to the purchase price, and the Trustee or Authentication Agent shall promptly
authenticate and mail or deliver to such Holders a new Security equal in
principal amount to any unpurchased portion of the Security surrendered.  Any
Security not accepted for payment shall be promptly mailed or delivered by the
Issuer to the Holder thereof.  The Issuer shall publicly announce the results of
the Offer on or as soon as practicable after the Purchase Date.

     SECTION 1016.  Change of Control.
                    -----------------

                                      -90-
<PAGE>

     (1) If a Change of Control shall occur at any time, then each Holder of
Securities shall have the right to require that the Issuer purchase such
Holder's Securities, in whole or in part in integral multiples of $1,000 or Euro
1,000, as the case may be, at a purchase price in cash, in an amount equal to
101% of the principal amount of such Securities or portion thereof, plus accrued
and unpaid interest and Liquidated Damages, if any, to the date of purchase,
pursuant to the Offer to Purchase and in accordance with the other procedures
set forth in this Indenture.  Within 30 days following the Change of Control,
the Issuer will mail an Offer to Purchase to each Holder describing the
transaction or transactions that constitute the Change of Control and offering
to purchase Securities on the date specified in the Offer to Purchase.  The
Issuer will comply with the requirements of Rule 14e-1 under the Exchange Act
and any other securities laws and regulations thereunder to the extent such laws
and regulations are applicable in connection with the purchase of the Securities
pursuant to the Offer to Purchase.

     (2) The Issuer shall perform its obligations specified in the Offer to
Purchase and the Trustee shall perform its obligations arising hereunder in
connection therewith.  Prior to the Purchase Date, the Issuer shall (i) accept
for payment Securities or portions thereof tendered pursuant to the Offer, (ii)
deposit with the Paying Agent (or, if the Issuer is acting as its own Paying
Agent, segregate and hold in trust as provided in Section 1003) money sufficient
to pay the purchase price of all Securities or portions thereof so accepted and
(iii) deliver or cause to be delivered to the Trustee all Securities so accepted
together with an Officers' Certificate stating the Securities or portions
thereof accepted for payment by the Issuer.  The Paying Agent shall promptly
mail or deliver to Holders of Securities so accepted payment in an amount equal
to the purchase price, and the Trustee or Authentication Agent shall promptly
authenticate and mail or deliver to such Holders a new Security or Securities
equal in principal amount to any unpurchased portion of the Security surrendered
as requested by the Holder.  Any Security not accepted for payment shall be
promptly mailed or delivered by the Issuer to the Holder thereof.  The Issuer
shall publicly announce the results of the Offer on or as soon as practicable
after the Purchase Date.

     (3) Notwithstanding the foregoing, the Issuer will not be required to make
an Offer to Purchase upon a Change of Control if a third party makes the Offer
to Purchase in the manner, at the times and otherwise in compliance with the
requirements set forth in this Section 1016 and this Indenture applicable to the
Offer to Purchase made by the Issuer and purchases all Securities validly
tendered and not withdrawn under such Offer to Purchase.

     SECTION 1017.  Transactions with Affiliates and Related Persons.  The
                    ------------------------------------------------
Issuer may not, and may not permit any Restricted Subsidiary to, enter into any
transaction (or series of related transactions) not in the ordinary course of
business with an Affiliate or Related Person of the Issuer (other than the
Issuer or a Wholly Owned Restricted Subsidiary) involving aggregate
consideration in excess of $5.0 million, including any Investment, either
directly or indirectly, unless such transaction is on terms no less favorable to
the Issuer or such Restricted Subsidiary than those that could be obtained in a
comparable arm's-length transaction with an entity that is not an Affiliate or
Related Person and is in the best interests of the Issuer or such Restricted
Subsidiary.  For any

                                      -91-
<PAGE>

transaction (or series of related transactions) that involves less than or equal
to $10.0 million, the Chief Executive Officer, President or Chief Operating
Officer of the Issuer shall determine that the transaction satisfies the above
criteria and shall evidence such a determination by an Officer's Certificate
filed with the Trustee. For any transaction that involves in excess of $10.0
million, (a) a majority of the disinterested members of the Board of Directors
shall determine that the transaction satisfies the above criteria or (b) the
Issuer shall obtain a written opinion of a nationally recognized investment
banking or appraisal firm stating that the transaction is fair to the Issuer or
such Restricted Subsidiary.

     The foregoing limitation does not apply, and shall not apply, to (i) any
transaction solely between the Issuer and any Restricted Subsidiary or solely
between any Restricted Subsidiaries; (ii) the payment of reasonable and
customary regular fees to directors of the Issuer who are not employees of the
Issuer; (iii) any payments or other transactions pursuant to any tax-sharing
agreement between the Issuer and any other Person with which the Issuer files a
consolidated tax return or with which the Issuer is part of a consolidated group
for tax purposes; (iv) licensing or sublicensing or the use of any intellectual
property by the Issuer or any Restricted Subsidiary to the Issuer or any
Restricted Subsidiary; (v) any transaction entered into for the purpose of
granting or altering registration rights with respect to any Capital Stock of
the Issuer; (vi) any Restricted Payments not prohibited by Section 1011 or (vii)
compensation, severance and employee benefit arrangements with any officer,
director or employee of the Issuer or any Restricted Subsidiary, including under
any stock option or stock incentive plans, in the ordinary course of business.

     SECTION 1018.  Unrestricted Subsidiaries.  The Issuer may designate any
                    -------------------------
Subsidiary of the Issuer to be an "Unrestricted Subsidiary" as provided below in
which event such Subsidiary and each other Person that is then, or thereafter
becomes, a Subsidiary of such Subsidiary will be deemed to be an Unrestricted
Subsidiary.  "Unrestricted Subsidiary" means (1) any Subsidiary designated as
such by the Board of Directors as set forth below where (a) no default with
respect to any Debt of such Subsidiary or any Subsidiary of such Subsidiary
(including any right which the holders thereof may have to take enforcement
action against such Subsidiary) would permit (upon notice, lapse of time or
both) any holder of any other Debt in a principal amount in excess of $10.0
million of the Issuer and its Subsidiaries (other than another Unrestricted
Subsidiary) to declare a default on such other Debt or cause the payment thereof
to be accelerated or payable prior to its final scheduled maturity and (b) the
Issuer could make a Restricted Payment in an amount equal to the greater of the
fair market value and book value of such Subsidiary pursuant to Section 1011 and
such amount is thereafter treated as a Restricted Payment for the purpose of
calculating the aggregate amount available for Restricted Payments thereunder
and (2) any Subsidiary of an Unrestricted Subsidiary.  The Board of Directors
may not designate a Subsidiary to be an Unrestricted Subsidiary if such
Subsidiary owns any Capital Stock of, or owns or holds any Lien on any property
of, any other Subsidiary of the Issuer which is not a Subsidiary of the
Subsidiary to be so designated or otherwise an Unrestricted Subsidiary.  The
Board of Directors may designate any Unrestricted Subsidiary a Restricted
Subsidiary and shall be deemed to have made such designation if at such time the
condition set forth in clause (a) in the definition of "Unrestricted Subsidiary"
shall cease to be true.

                                      -92-
<PAGE>

     SECTION 1019. Provision of Financial Information. Whether or not the Issuer
                   ----------------------------------
is required to be subject to Section 13(a) or 15(d) of the Exchange Act, the
Issuer shall file with the Commission the annual reports, quarterly reports and
other documents which the Issuer would have been required to file with the
Commission pursuant to such Section 13(a) or 15(d) or any successor provision
thereto if the Issuer were so required, such documents to be filed with the
Commission on or prior to the respective dates (each a "Required Filing Date,"
collectively, the "Required Filing Dates") by which the Issuer would have been
required so to file such documents if the Issuer were so required.  The Issuer
shall also in any event (a) within 15 days of each Required Filing Date (i)
transmit by mail to all Holders, as their names and addresses appear in the
Security Register, without cost to such Holders, and (ii) file with the Trustee,
copies of the annual reports, quarterly reports and other documents which the
Issuer files with the Commission pursuant to such Section 13(a) or 15(d) or any
successor provision thereto or would have been required to file with the
Commission pursuant to such Section 13(a) or 15(d) or any successor provisions
thereto if the Issuer were required to be subject to such Sections and (b) if
filing such documents by the Issuer with the Commission is not permitted under
the Exchange Act, promptly upon written request supply copies of such documents
to any prospective Holder.

     SECTION 1020. Statement by Officers as to Default; Compliance Certificates.
                   ------------------------------------------------------------

     (1) The Issuer will deliver to the Trustee, within 90 days after the end of
its fiscal year, which initially shall be December 31, and within 60 days after
the end of each fiscal quarter (other than the fourth fiscal quarter), of the
Issuer ending after the date hereof an Officers' Certificate, stating whether or
not to the best knowledge of the signers thereof the Issuer is in default in the
performance and observance of any of the terms, provisions and conditions of
Section 801 or Sections 1004 to 1018, inclusive, and if an Issuer shall be in
default, specifying all such defaults and the nature and status thereof of which
they may have knowledge.

     (2) The Issuer shall deliver to the Trustee, as soon as possible and in any
event within 10 days after an Issuer becomes aware of the occurrence of an Event
of Default or an event which, with notice or the lapse of time or both, would
constitute an Event of Default, an Officers' Certificate setting forth the
details of such Event of Default or default, and the action which the Issuer
proposes to take with respect thereto.

     (3) The Issuer shall deliver to the Trustee within 90 days after the end of
each fiscal year a written statement by the Issuer's independent public
accountants stating (A) that their audit examination has included a review of
the terms of this Indenture and the Securities as they relate to accounting
matters, and (B) whether, in connection with their audit examination, any event
which, with notice or the lapse of time or both, would constitute an Event of
Default under Section 1008 and Section 1011 has come to their attention and, if
such a default has come to their attention, specifying the nature and period of
the existence thereof.

     SECTION 1021.  Waiver of Certain Covenants.  The Issuer may omit in any
                    ---------------------------
particular instance to comply with any covenant or condition set forth in
Section 801 and Sections 1004 to

                                      -93-
<PAGE>

1018, if before the time for such compliance the Holders of at least a majority
in principal amount of the Outstanding Securities shall, by Act of such Holders,
either waive such compliance in such instance or generally waive compliance with
such covenant or condition, but no such waiver shall extend to or affect such
covenant or condition except to the extent so expressly waived, and, until such
waiver shall become effective, the obligations of the Issuer and the duties of
the Trustee in respect of any such covenant or condition shall remain in full
force and effect; provided, however, with respect to an Offer to Purchase as to
which an Offer has been mailed, no such waiver may be made or shall be effective
against any Holder tendering Securities pursuant to such Offer, and the Issuer
may not omit to comply with the terms of such Offer as to such Holder.

                                ARTICLE ELEVEN

                           Redemption of Securities

     SECTION 1101.  Right of Redemption.
                    -------------------

     (a) At any time prior to December 15, 2002, the Issuer may redeem up to 35%
of the aggregate Outstanding principal amount of the Dollar Securities and up to
35% of the aggregate Outstanding principal amount of the Euro Securities with
the Net Cash Proceeds of one or more sales of Capital Stock (other than
Disqualified Stock) at a Redemption Price equal to 110.75% of the aggregate
principal amount thereof, plus accrued and unpaid interest thereon and
Liquidated Damages, if any, to the date of redemption; provided that at least
65% of the original principal amount of the Dollar Securities and 65% of the
original principal amount of the Dollar Securities remains Outstanding
immediately following such redemption.  In order to effect the foregoing
redemption, the Issuer must mail a notice of redemption no later than 45 days
after the related sale of Capital Stock and must consummate such redemption
within 60 days of the closing of the sale of Capital Stock.

     (b) The Securities further may be redeemed at the election of the Issuer,
as a whole or from time to time in part, at any time on or after December 15,
2004, at the Redemption Prices specified in the form of Security hereinbefore
set forth together with accrued interest to the Redemption Date.

     SECTION 1102.  Applicability of Article.  Redemption of Securities at the
                    ------------------------
election of the Issuer, as permitted by any provision of this Indenture, shall
be made in accordance with such provision and this Article.

     SECTION 1103.  Election to Redeem; Notice to Trustee.  The election of the
                    -------------------------------------
Issuer to redeem any Securities pursuant to Section 1101 shall be evidenced by a
Board Resolution of the Issuer.  In case of any redemption at the election of
the Issuer of the Securities, the Issuer shall, at least 40 days prior to the
Redemption Date fixed by the Issuer (unless a shorter notice shall be
satisfactory to the Trustee), notify the Trustee in writing of such Redemption
Date and of the

                                      -94-
<PAGE>

principal amount of Securities to be redeemed (except that in the case of a
redemption pursuant to Section 1101(a), notice shall be given by the Issuer to
the Trustee not less than 15 days prior to the Redemption Date). In the case of
any redemption pursuant to Section 1101(a), the Issuer shall also furnish the
Trustee an Officers' Certificate stating that the Issuer is entitled to effect
such redemption and setting forth a statement of facts showing that the
condition or conditions precedent to the right of the Issuer to redeem have
occurred or been satisfied.

     SECTION 1104.  Selection by Trustee of Securities to Be Redeemed.  If less
                    -------------------------------------------------
than all the Securities are to be redeemed, the particular Securities to be
redeemed shall be selected not more than 60 days prior to the Redemption Date by
the Trustee, from the Outstanding Securities not previously called for
redemption, by such method as the Trustee shall deem fair and appropriate and
which may provide for the selection for redemption of portions (equal to $1,000
or Euro 1,000, as the case may be, or any integral multiple thereof) of the
principal amount of Securities of a denomination larger than $1,000 or Euro
1,000, as the case may be.

     The Trustee shall promptly notify the Issuer and each Security Registrar in
writing of the Securities selected for redemption and, in the case of any
Securities selected for partial redemption, the principal amount thereof to be
redeemed.

     For all purposes of this Indenture, unless the context otherwise requires,
all provisions relating to the redemption of Securities shall relate, in the
case of any Securities redeemed or to be redeemed only in part, to the portion
of the principal amount of such Securities which has been or is to be redeemed.

     SECTION 1105.  Notice of Redemption.  Notice of redemption shall be given
                    --------------------
by first-class mail, postage prepaid, mailed not less than 30 nor more than 60
days prior to the Redemption Date by the Issuer, or at its request by the
Trustee (except that in the case of a redemption pursuant to Section 1101(a),
the Issuer shall give notice and such notice shall be given not less than 15 nor
more than 60 days prior to the Redemption Date), to each Holder of Securities to
be redeemed, (with a copy to the Trustee, delivered or mailed to the Corporate
Trust Office) at his address appearing in the Security Register.  The Issuer
shall also issue a Press Release simultaneously with issuing such notice of
redemption and including all of the relevant information from such notice.

     All notices of redemption shall include the CUSIP number (or ISIN number as
applicable) and shall state:

          (1)  the Redemption Date,

          (2)  the Redemption Price,

          (3) whether the redemption is being made pursuant to Section 1101(a)
or (b) and, if being made pursuant to Section 1101(a), a brief statement setting
forth the Issuer's right to effect such redemption and the Issuer's basis
therefor,

                                      -95-
<PAGE>

          (4) if less than all the Outstanding Securities are to be redeemed,
the identification (and, in the case of partial redemption, the principal
amounts) of the particular Securities to be redeemed,

          (5) that on the Redemption Date the Redemption Price will become due
and payable upon each such Security to be redeemed and that interest thereon
will cease to accrue on and after said date, and

          (6) the place or places where such Securities are to be surrendered
for payment of the Redemption Price.

     Notice of redemption of Securities to be redeemed at the election of the
Issuer shall be given by the Issuer or, at the Issuer's request, by the Trustee
in the name and at the sole expense of the Issuer.

     SECTION 1106.  Deposit of Redemption Price.  On or prior to any Redemption
                    ---------------------------
Date, the Issuer shall deposit with the Trustee or with a Paying Agent (or, if
the Issuer is acting as its own Paying Agent, segregate and hold in trust as
provided in Section 1003) an amount of money sufficient to pay the Redemption
Price of, and (except if the Redemption Date shall be an Interest Payment Date)
accrued interest on, all the Securities which are to be redeemed on that date.

     SECTION 1107.  Securities Payable on Redemption Date.  Notice of redemption
                    -------------------------------------
having been given as aforesaid, the Securities so to be redeemed shall, on the
Redemption Date, become due and payable at the Redemption Price therein
specified, and from and any after such date (unless the Issuer shall default in
the payment of the Redemption Price and any accrued interest) such Securities
shall cease to bear interest.  Upon surrender of any such Security for
redemption in accordance with said notice, such Security shall be paid by the
Issuer at the Redemption Price, together with any applicable accrued interest to
the Redemption Date; provided, however, that installments of interest whose
Stated Maturity is on or prior to the Redemption Date shall be payable to the
Holders of such Securities, or one or more Predecessor Securities, registered as
such at the close of business on the relevant Record Dates according to its
terms and the provisions of Section 308.

     If any Security called for redemption shall not be so paid upon surrender
thereof for redemption, the principal (and premium, if any) shall, until paid,
bear interest from the Redemption Date at the rate provided by the Security.

     SECTION 1108.  Securities Redeemed in Part.  Any Security which is to be
                    ---------------------------
redeemed only in part shall be surrendered at an office or agency of the Issuer
designated for that purpose pursuant to Section 1002 (with, if the Issuer or the
Trustee so requires, due endorsement by, or a written instrument of transfer in
form satisfactory to the Issuer and the Trustee duly executed by, the Holder
thereof or his attorney duly authorized in writing), and the Issuer shall
execute, and the Trustee or Authentication Agent shall authenticate and deliver
to the Holder of such Security without service

                                      -96-
<PAGE>

charge, a new Security or Securities, of any authorized denomination as
requested by such Holder, in aggregate principal amount equal to and in exchange
for the unredeemed portion of the principal of the Security so surrendered.

                                ARTICLE TWELVE

                      Defeasance and Covenant Defeasance

     SECTION 1201.  Issuer's Option to Effect Defeasance or Covenant Defeasance.
                    -----------------------------------------------------------
The Issuer may at its option by Board Resolution, at any time, elect to have
either Section 1202 or Section 1203 applied to the Outstanding Securities upon
compliance with the conditions set forth below in this Article Twelve.

     SECTION 1202.  Defeasance and Discharge.  Upon the Issuer's exercise of the
                    ------------------------
option provided in Section 1201 applicable to this Section, the Issuer shall be
deemed to have been discharged from its obligations with respect to the
Outstanding Securities on the date the conditions set forth below are satisfied
(hereinafter, "defeasance").  For this purpose, such defeasance means that the
Issuer shall be deemed to have paid and discharged the entire indebtedness
represented by the Outstanding Securities and to have satisfied all its other
obligations under such Securities and this Indenture insofar as such Securities
are concerned (and the Trustee, at the expense of the Issuer, shall execute
proper instruments acknowledging the same), except for the following which shall
survive until otherwise terminated or discharged hereunder:  (A) the rights of
Holders of such Securities to receive, solely from the trust fund described in
Section 1204 and as more fully set forth in such Section, payments in respect of
the principal of (and premium, if any) and interest on such Securities when such
payments are due, (B) the Issuer's obligations with respect to such Securities
under Sections 304, 305, 306, 1002 and 1003, (C) the rights, powers, trusts,
duties and immunities of the Trustee hereunder and (D) this Article Twelve.
Subject to compliance with this Article Twelve, the Issuer may exercise its
option under this Section 1202 notwithstanding the prior exercise of its option
under Section 1203.

     SECTION 1203.  Covenant Defeasance.  Upon the Issuer's exercise of the
                    -------------------
option provided in Section 1201 applicable to this Section, (i) the Issuer shall
be released from its obligations under Sections 1005 through 1018, inclusive,
and Clauses (3), (4) and (5) of Section 801 and (ii) the occurrence of an event
specified in Sections 501(3), 501(4) (with respect to Clauses (3), (4) or (5) of
Section 801), 501(5) (with respect to any of Sections 1005 through 1018,
inclusive), 501(6) and 501(7) shall not be deemed to be an Event of Default on
and after the date the conditions set forth below are satisfied (hereinafter,
"covenant defeasance"). For this purpose, such covenant defeasance means that
the Issuer may omit to comply with and shall have no liability in respect of any
term, condition or limitation set forth in any such Section or Clause, whether
directly or indirectly by reason of any reference elsewhere herein to any such
Section or Clause or by reason of any reference in any such Section or Clause to
any other provision herein or in any other document, but the remainder of this
Indenture and such Securities shall be unaffected thereby.

                                      -97-
<PAGE>

     SECTION 1204.  Conditions to Defeasance or Covenant Defeasance.  The
                    -----------------------------------------------
following shall be the conditions to application of either Section 1202 or
Section 1203 to the then Outstanding Securities:

     (1) The Issuer shall irrevocably have deposited or caused to be deposited
with the Trustee (or another trustee satisfying the requirements of Section 609
who shall agree to comply with the provisions of this Article Twelve applicable
to it) as trust funds in trust for the purpose of making the following payments,
specifically pledged as security for, and dedicated solely to, the benefit of
the Holders of such Securities, (A) money in an amount, or (B) U.S. Government
Obligations which through the scheduled payment of principal and interest in
respect thereof in accordance with their terms will provide, not later than one
day before the due date of any payment, money in an amount, or (C) a combination
thereof, sufficient, in the opinion of a nationally recognized firm of
independent public accountants expressed in a written certification thereof
delivered to the Trustee, to pay and discharge, and which shall be applied by
the Trustee (or other qualifying trustee) to pay and discharge, the principal
of, premium, if any, and each instalment of interest on the Securities on the
Stated Maturity of such principal or instalment of interest in accordance with
the terms of this Indenture and of such Securities. For this purpose, "U.S.
Government Obligations" means securities that are (x) direct obligations of the
United States of America for the payment of which its full faith and credit is
pledged or (y) obligations of a Person controlled or supervised by and acting as
an agency or instrumentality of the United States of America the payment of
which is unconditionally guaranteed as a full faith and credit obligation by the
United States of America, which, in either case, are not callable or redeemable
at the option of the issuer thereof, and shall also include a depository receipt
issued by a bank (as defined in Section 3(a)(2) of the Securities Act as
custodian with respect to any such U.S. Government Obligation or a specific
payment of principal of or interest on any such U.S. Government Obligation held
by such custodian for the account of the holder of such depository receipt,
provided that (except as required by law) such custodian is not authorized to
make any deduction from the amount payable to the holder of such depository
receipt from any amount received by the custodian in respect of the U.S.
Government Obligation or the specific payment of principal of or interest on the
U.S. Government Obligation evidenced by such depository receipt.

     (2) In the case of an election under Section 1202, the Issuer shall have
delivered to the Trustee an Opinion of Counsel stating that (x) the Issuer has
received from, or there has been published by, the Internal Revenue Service a
ruling, or (y) since the date of this Indenture there has been a change in the
applicable Federal income tax law, in either case to the effect that, and based
thereon such opinion shall confirm that, the Holders of the Outstanding
Securities will not recognize gain or loss for Federal income tax purposes as a
result of such deposit, defeasance and discharge and will be subject to Federal
income tax on the same amount, in the same manner and at the same times as would
have been the case if such deposit, defeasance and discharge had not occurred.

     (3) In the case of an election under Section 1203, the Issuer shall have
delivered to the Trustee an Opinion of Counsel to the effect that the Holders of
the Outstanding Securities will not recognize gain or loss for Federal income
tax purposes as a result of such deposit and covenant

                                      -98-
<PAGE>

defeasance and will be subject to Federal income tax on the same amount, in the
same manner and at the same times as would have been the case if such deposit
and covenant defeasance had not occurred.

     (4) The Issuer shall have delivered to the Trustee an Officer's Certificate
to the effect that the Securities, if then listed on any securities exchange,
will not be delisted as a result of such deposit.

     (5) Such defeasance or covenant defeasance shall not cause the Trustee to
have a conflicting interest as defined in Section 608 and for purposes of the
Trust Indenture Act with respect to any securities of the Issuer.

     (6) No Event of Default or event which with notice or lapse of time or both
would become an Event of Default shall have occurred and be continuing on the
date of such deposit or, insofar as subsections 501(9) and (10) are concerned,
at any time during the period ending on the 121st day after the date of such
deposit (it being understood that this condition shall not be deemed satisfied
until the expiration of such period).

     (7) Such defeasance or covenant defeasance shall not result in a breach or
violation of, or constitute a default under, any other agreement or instrument
to which the Issuer or any Restricted Subsidiaries is a party or by which it is
bound.

     (8) The Issuer shall have delivered to the Trustee an Officers' Certificate
and an Opinion of Counsel, each stating that all conditions precedent provided
for relating to either the defeasance under Section 1202 or the covenant
defeasance under Section 1203 (as the case may be) have been complied with.

     (9) Such defeasance or covenant defeasance shall not result in the trust
arising from such deposit constituting an investment company as defined in the
Investment Issuer Act of 1940, as amended, or such trust shall be qualified
under such act or exempt from regulation thereunder.

     SECTION 1205.  Deposited Money and U.S. Government Obligations to Be Held
                    ----------------------------------------------------------
in Trust; Other Miscellaneous Provisions.  Subject to the provisions of the last
----------------------------------------
paragraph of Section 1003, all money and U.S. Government Obligations (including
the proceeds thereof) deposited with the Trustee (or other qualifying trustee--
collectively, for purposes of this Section 1205, the "Trustee") pursuant to
Section 1204 in respect of the Securities shall be held in trust and applied by
the Trustee, in accordance with the provisions of such Securities and this
Indenture, to the payment, either directly or through any Paying Agent
(including the Issuer acting as its own Paying Agent) as the Trustee may
determine, to the Holders of such Securities, of all sums due and to become due
thereon in respect of principal (and premium, if any) and interest, but such
money need not be segregated from other funds except to the extent required by
law.

                                      -99-
<PAGE>

     The Issuer shall pay and indemnify the Trustee against any tax, fee or
other charge imposed on or assessed against the U.S. Government Obligations
deposited pursuant to Section 1204 or the principal and interest received in
respect thereof other than any such tax, fee or other charge which by law is for
the account of the Holders of the Outstanding Securities.

     Anything in this Article Twelve to the contrary notwithstanding, the
Trustee shall deliver or pay to the Issuer from time to time upon Issuer Request
any money or U.S. Government Obligations held by it as provided in Section 1204
which, in the opinion of a nationally recognized firm of independent public
accountants expressed in a written certification thereof delivered to the
Trustee, are in excess of the amount thereof which would then be required to be
deposited to effect an equivalent defeasance or covenant defeasance.

     SECTION 1206.  Reinstatement.  If the Trustee or the Paying Agent is unable
                    -------------
to apply any money in accordance with Section 1202 or 1203 by reason of any
order or judgment of any court or governmental authority enjoining, restraining
or otherwise prohibiting such application, then the Issuer's obligations under
this Indenture and the Securities shall be revived and reinstated as though no
deposit had occurred pursuant to this Article Twelve until such time as the
Trustee or Paying Agent is permitted to apply all such money in accordance with
Section 1202 or 1203; provided, however, that if the Issuer makes any payment of
principal of (and premium, if any) or interest on any Security following the
reinstatement of its obligations, the Issuer shall be subrogated to the rights
of the Holders of such Securities to receive such payment from the money held by
the Trustee or the Paying Agent.

                                     -100-
<PAGE>

     This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

     IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be
duly executed as of the day and year first above written.

                                    EXODUS COMMUNICATIONS, INC.

                                    By   /s/ Ellen M. Hancock
                                       --------------------------------------
                                      Name:  Ellen M. Hancock
                                      Title: President and CEO

                                    CHASE MANHATTAN BANK AND TRUST
                                     COMPANY, NATIONAL ASSOCIATION,
                                     as Trustee

                                    By   /s/ Cecil Bobey
                                       --------------------------------------
                                      Name:  Cecil Bobey
                                      Title: Assistant Vice President

                                     -101-
<PAGE>

                              ANNEX A -- Form of
                           Regulation S Certificate

                           REGULATION S CERTIFICATE

        (For transfers pursuant to Section 306(b)(1) of the Indenture)

Chase Manhattan Bank and Trust Company,
 National Association
101 California Street, Suite 2725
San Francisco, CA  94111
Attention: Corporate Trust Administration

     Re:   10 3/4% Senior Notes due 2009 of
           Exodus Communications, Inc. (the "Securities")
           ----------------------------------------------

     Reference is made to the Indenture, dated as of December 1, 1999 (the
"Indenture"), between Exodus Communications, Inc. (the "Issuer") and Chase
Manhattan Bank and Trust Company, National Association, as Trustee.  Terms used
herein and defined in the Indenture or in Regulation S or Rule 144 under the
U.S. Securities Act of 1933 (the "Securities Act") are used herein as so
defined.

     This certificate relates to [U.S. $____________][Euro ____________]
principal amount of Securities, which are evidenced by the following
certificate(s) (the "Specified Securities"):

     CUSIP [ISIN] No(s). ___________________________

     CERTIFICATE No(s). _____________________

The person in whose name this certificate is executed below (the "Undersigned")
hereby certifies that either (i) it is the sole beneficial owner of the
Specified Securities or (ii) it is acting on behalf of all the beneficial owners
of the Specified Securities and is duly authorized by them to do so.  Such
beneficial owner or owners are referred to herein collectively as the "Owner".
If the Specified Securities are represented by a Global Security, they are held
through the Depositary or an Agent Member in the name of the Undersigned, as or
on behalf of the Owner.  If the Specified Securities are not represented by a
Global Security, they are registered in the name of the Under signed, as or on
behalf of the Owner.

     The Owner has requested that the Specified Securities be transferred to a
person (the "Transferee") who will take delivery in the form of a Regulation S
Security or an interest therein.  In connection with such transfer, the Owner
hereby certifies that, unless such transfer is being effected
<PAGE>

pursuant to an effective registration statement under the Securities Act, it is
being effected in accordance with Rule 904 or Rule 144 under the Securities Act
and with all applicable securities laws of the states of the United States and
other jurisdictions. Accordingly, the Owner hereby further certifies as follows:

     (1)  Rule 904 Transfers.  If the transfer is being effected in accordance
          ------------------
with Rule 904:

          (A)  the Owner is not a distributor of the Securities, an affiliate of
the Issuer or any such distributor or a person acting on behalf of any of the
foregoing;

          (B)  the offer of the Specified Securities was not made to a person in
the United States;

          (C)  either:

               (i)  at the time the buy order was originated, the Transferee was
outside the United States or the Owner and any person acting on its behalf
reasonably believed that the Transferee was outside the United States, or

               (ii) the transaction is being executed in, on or through the
facilities of the Eurobond market, as regulated by the Association of
International Bond Dealers, or another designated offshore securities market and
neither the Owner nor any person acting on its behalf knows that the transaction
has been prearranged with a buyer in the United States;

          (D)  no directed selling efforts in contravention of Rule 904(a)(2)
have been made in the United States by or on behalf of the Owner or any
affiliate thereof;

          (E)  if the Owner is a dealer in securities or has received a selling
concession, fee or other remuneration in respect of the Specified Securities,
and the transfer is to occur during the Distribution Compliance Period, then the
requirements of Rule 904(b)(1) have been satisfied; and

          (F)  the transaction is not part of a plan or scheme to evade the
registration requirements of the Securities Act.

     (2)  Rule 144 Transfers.  If the transfer is being effected pursuant to
          ------------------
Rule 144:

          (A)  the transfer is occurring

               (i) after a holding period of at least one year (computed in
accordance with paragraph (d) of Rule 144) has elapsed since the Specified
Securities were last acquired from an Issuer or from an affiliate of the Issuer,
whichever is later, and is being effected in accordance with the applicable
amount, manner of sale and notice requirements of Rule 144; or

                                      A-2
<PAGE>

               (i)  after a holding period of at least two years has elapsed
since the Specified Securities were last acquired from the Issuer or from an
affiliate of the Issuer, whichever is later, and the Owner is not, and during
the preceding three months has not been, an affiliate of the Issuer; and

          (B)  the Specified Securities are being transferred in compliance with
any applicable "blue sky" securities laws of all applicable states of the United
States.

     This certificate and the statements contained herein are made for your
benefit and the benefit of the Issuer and the Initial Purchasers.

Dated:

          (Print the name of the Undersigned, as such term is defined in
          the second paragraph of this certificate.)

          By:_____________________________________________ *
              Name:
              Title:

     (If the Undersigned is a corporation, partnership or fiduciary, the title
of the person signing on behalf of the Undersigned must be stated.)

*    Signature must be guaranteed by an eligible Guarantor Institution (banks,
     stockbrokers, savings and loan associations and credit unions) with
     membership in an approved signature medallion program pursuant to
     Securities and Exchange Commission Rule 17Ad-15.

                                      A-3
<PAGE>

                         ANNEX B -- Form of Restricted
                            Securities Certificate

                       RESTRICTED SECURITIES CERTIFICATE

        (For transfers pursuant to Section 306(b)(2) of the Indenture)

Chase Manhattan Bank and Trust Company,
 National Association
101 California Street, Suite 2725
San Francisco, California  94111
Attention:  Corporate Trust Administration

     Re:  10 3/4% Senior Notes due 2009
          of Exodus Communications, Inc. (the "Securities")
          -------------------------------------------------

     Reference is made to the Indenture, dated as of December 1, 1999 (the
"Indenture"), between Exodus Communications, Inc. (the "Issuer") and Chase
Manhattan Bank and Trust Company, National Association, as Trustee.  Terms used
herein and defined in the Indenture or in Rule 144A or Rule 144 under the U.S.
Securities Act of 1933 (the "Securities Act") are used herein as so defined.

     This certificate relates to [U.S. $_____________][Euro_____________]
principal amount of Securities, which are evidenced by the following
certificate(s) (the "Specified Securities"):

     CUSIP No(s). ___________________________
     ISIN No(s), If any. ____________________
     CERTIFICATE No(s). _____________________

The person in whose name this certificate is executed below (the "Undersigned")
hereby certifies that either (i) it is the sole beneficial owner of the
Specified Securities or (ii) it is acting on behalf of all the beneficial owners
of the Specified Securities and is duly authorized by them to do so.  Such
beneficial owner or owners are referred to herein collectively as the "Owner".
If the Specified Securities are represented by a Global Security, they are held
through the Depositary or an Agent Member in the name of the Undersigned, as or
on behalf of the Owner.  If the Specified Securities are not represented by a
Global Security, they are registered in the name of the Undersigned, as or on
behalf of the Owner.

     The Owner has requested that the Specified Securities be transferred to a
person (the "Transferee") who will take delivery in the form of a Restricted
Security or an interest in a Restricted Global Security.  In connection with
such transfer, the Owner hereby certifies that, unless such
<PAGE>

transfer is being effected pursuant to an effective registration statement under
the Securities Act, (i) the Owner is not a U.S. Person (as defined in the
Indenture) and (ii) such transfer is being effected in accordance with Rule 144A
or Rule 144 under the Securities Act and all applicable securities laws of the
states of the United States and other jurisdictions. Accordingly, the Owner
hereby further certifies as follows:

     (1)  Rule 144A Transfers.  If the transfer is being effected in accordance
          -------------------
with Rule 144A:

          (A)  the Specified Securities are being transferred to a person that
the Owner and any person acting on its behalf reasonably believe is a "qualified
institutional buyer" within the meaning of Rule 144A, acquiring for its own
account or for the account of a qualified institutional buyer; and

          (B)  the Owner and any person acting on its behalf have taken
reasonable steps to ensure that the Transferee is aware that the Owner may be
relying on Rule 144A in connection with the transfer; and

          (C)  the Specified Securities are being transferred in compliance with
any applicable "blue sky" securities laws of all applicable states of the United
States.

     (2)  Rule 144 Transfers. If the transfer is being effected pursuant to Rule
          ------------------
144:

          (A)  the transfer is occurring

               (i)  after a holding period of at least one year (computed in
accordance with paragraph (d) of Rule 144) has elapsed since the Specified
Securities were last acquired from an Issuer or from an affiliate of the Issuer,
whichever is later, and is being effected in accordance with the applicable
amount, manner of sale and notice requirements of Rule 144; or

               (ii) after a holding period of at least two years has elapsed
since the Specified Securities were last acquired from an Issuer or from an
affiliate of the Issuer, whichever is later, and the Owner is not, and during
the preceding three months has not been, an affiliate of the Issuer; and

          (B)  the Specified Securities are being transferred in compliance with
any applicable "blue sky" securities laws of all applicable states of the United
States.

     This certificate and the statements contained herein are made for your
benefit and the benefit of the Issuer, and the Initial Purchasers.

                                      B-2
<PAGE>

Dated:    _______________________________________________________
          (Print the name of the Undersigned, as such term is
          defined in the second paragraph of this certificate.)

          By:____________________________________________________*
              Name:
              Title:

             (If the Undersigned is a corporation, partnership or
             fiduciary, the title of the person signing on behalf of
             the Undersigned must be stated.)

*    Signature must be guaranteed by an eligible Guarantor Institution (banks,
     stockbrokers, savings and loan associations and credit unions) with
     membership in an approved signature medallion program pursuant to
     Securities and Exchange Commission Rule 17Ad-15.

                                      B-3
<PAGE>

                        ANNEX C -- Form of Unrestricted
                            Securities Certificate

                      UNRESTRICTED SECURITIES CERTIFICATE

   (For removal of Securities Act Legends pursuant to Section 306(c) of the
                                  Indenture)

Chase Manhattan Bank and Trust Company,
 National Association
101 California Street, Suite 2725
San Francisco, California  94111
Attention:  Corporate Trust Trustee Administration

     Re:  10 3/4% Senior Notes due 2009
          of Exodus Communications, Inc. (the "Securities")
          -------------------------------------------------

     Reference is made to the Indenture, dated as of December 1, 1999 (the
"Indenture"), between Exodus Communications, Inc. (the "Issuer") and Chase
Manhattan Bank and Trust Company, National Association, as Trustee.  Terms used
herein and defined in the Indenture or in Rule 144 under the U.S. Securities Act
of 1933 (the "Securities Act") are used herein as so defined.

     This certificate relates to [U.S. $_____________][Euro _____________]
principal amount of Securities, which are evidenced by the following
certificate(s) (the "Specified Securities"):

     [CUSIP][ISIN] No(s). ___________________________

     CERTIFICATE No(s). _____________________

The person in whose name this certificate is executed below (the "Undersigned")
hereby certifies that either (i) it is the sole beneficial owner of the
Specified Securities or (ii) it is acting on behalf of all the beneficial owners
of the Specified Securities and is duly authorized by them to do so.  Such
beneficial owner or owners are referred to herein collectively as the "Owner".
If the Specified Securities are represented by a Global Security, they are held
through the Depositary or an Agent Member in the name of the Undersigned, as or
on behalf of the Owner.  If the Specified Securities are not represented by a
Global Security, they are registered in the name of the Under signed, as or on
behalf of the Owner.

     The Owner has requested that the Specified Securities be exchanged for
Securities bearing no Securities Act Legend pursuant to Section 306(c) of the
Indenture.  In connection with such exchange, the Owner hereby certifies that
the exchange is occurring after a holding period of at least two years (computed
in accordance with paragraph (d) of Rule 144) has elapsed since the Specified
<PAGE>

Securities were last acquired from an Issuer or from an affiliate of the Issuer,
whichever is later, and the Owner is not, and during the preceding three months
has not been, an affiliate of the Issuer. The Owner also acknowledges that any
future transfers of the Specified Securities must comply with all applicable
securities laws of the states of the United States and other jurisdictions.

     This certificate and the statements contained herein are made for your
benefit and the benefit of the Issuer, and the Initial Purchasers.

Dated:    _______________________________________________________
          (Print the name of the Undersigned, as such term is
          defined in the second paragraph of this certificate.)

          By:___________________________________________________*
             Name:
             Title:

             (If the Undersigned is a corporation, partnership or
             fiduciary, the title of the person signing on behalf of
             the Undersigned must be stated.)

*    Signature must be guaranteed by an eligible Guarantor Institution (banks,
     stockbrokers, savings and loan associations and credit unions) with
     membership in an approved signature medallion program pursuant to
     Securities and Exchange Commission Rule 17Ad-15.

                                      -2-<PAGE>

                                                                   EXHIBIT 10.72

                          EXODUS COMMUNICATIONS, INC.

                   $375,000,000 10 3/4% Senior Notes due 2009

                   $125,000,000 10 3/4% Senior Notes due 2009

                                 ____________

                              Purchase Agreement
                              ------------------

                                                                December 2, 1999
Goldman, Sachs & Co.
Donaldson, Lufkin & Jenrette
 Securities Corporation
BancBoston Robertson Stephens Inc.
PaineWebber Incorporated
Morgan Stanley & Co. Incorporated
c/o Goldman, Sachs & Co.
85 Broad Street,
New York, New York 10004
   As representative of the
   Several Purchasers Named
   on Schedule I hereto

Ladies and Gentlemen:

     Exodus Communications, Inc., a Delaware corporation (the "Company"),
proposes, subject to the terms and conditions stated herein, to issue and sell
to the Purchasers named in Schedule I hereto (the "Purchasers") an aggregate of
$375,000,000 principal amount of 10 3/4% Senior Notes due 2009 (the "Dollar
Securities") and $125,000,000 principal amount of 10 3/4% Senior Notes due 2009
(the "Euro Securities" and together with the Dollar Securities, the
"Securities").

     1.   The Company represents and warrants to, and agrees with, the
Purchasers that:

          (a)  A preliminary offering circular, dated November 24, 1999 (the
     "Preliminary Offering Circular") and an offering circular, dated December
     2, 1999 (the "Offering Circular") has been prepared in connection with the
     offering of the Securities. Additionally, the Company has previously
     prepared the following documents: the Company's Quarterly Reports on Form
     10-Q for the quarters ended March 31, 1999,
<PAGE>

     June 30, 1999 and September 30, 1999, the Company's Annual Report on Form
     10-K for the year ended December 31, 1998, each of the Company's Current
     Reports on Form 8-K, filed January 29, 1999, February 22, 1999, March 2,
     1999, June 18, 1999, August 11, 1999, October 12, 1999 and November 29,
     1999 and the amendment to the Company's registration statement on Form 8-A
     filed November 29, 1999 (together the "Exchange Act Reports"). Any
     reference (other than in Sections 7(a) hereof) to the Offering Circular
     shall be deemed to refer to and include the Exchange Act Reports, and any
     reference (other than in Section 7(a) hereof) to the Offering Circular as
     amended or supplemented as of any specified date after the date hereof
     shall be deemed to include (i) the Exchange Act Reports and all subsequent
     documents filed with the United States Securities and Exchange Commission
     (the "Commission") pursuant to Section 13(a), 13(c) or 15(d) of the United
     States Securities Exchange Act of 1934, as amended (the "Exchange Act"),
     after the date of the Offering Circular and prior to such specified date
     and (ii) any Additional Issuer Information (as defined in Section 5(f))
     furnished by the Company, prior to the completion of the distribution of
     the Securities. The Exchange Act Reports, when they were filed with the
     Commission, conformed in all material respects to the applicable
     requirements of the Exchange Act and the applicable rules and regulations
     of the Commission thereunder. The Preliminary Offering Circular, the
     Offering Circular and the Exchange Act Reports did not, as of their
     respective dates, contain an untrue statement of a material fact or omit to
     state a material fact necessary in order to make the statements therein, in
     the light of the circumstances under which they were made, not misleading;
     provided, however, that this representation and warranty shall not apply to
     any statements or omissions made in reliance upon and in conformity with
     information furnished in writing to the Company by a Purchaser through
     Goldman, Sachs & Co. expressly for use therein. Since September 30, 1999,
     the Company has not filed any documents with the Commission pursuant to
     Section 13(a), 13(c) or 15(d) of the Exchange Act other than the Exchange
     Act Reports;

          (b)  Neither the Company nor any of its subsidiaries has sustained
     since the date of the latest audited financial statements included in the
     Offering Circular any material loss or interference with its business from
     fire, explosion, flood or other calamity, whether or not covered by
     insurance, or from any labor dispute or court or governmental action, order
     or decree, otherwise than as set forth or contemplated in the Offering
     Circular; and, otherwise than as set forth or contemplated in the Offering
     Circular, since the respective dates as of which information is given in
     the Offering Circular, there has not been any change in the capital stock
     or long-term debt of the Company or any of its subsidiaries or any material
     adverse change, or any development that is reasonably likely to result in a
     material adverse change, in or affecting the general affairs, management,
     financial position, stockholders' equity or results of operations of the
     Company and its subsidiaries;

          (c)  The Company has no subsidiary that is a "Significant Subsidiary"
     of the Company within the meaning of Regulation S-X under the Securities
     Act of 1933, as amended (the "Securities Act"), other than Cohesive
     Technology Solutions, Inc. ("Cohesive");

                                       2
<PAGE>

          (d)  The Company and its subsidiaries own no real property. The
     Company and its subsidiaries have good and marketable title to all personal
     property owned by them, in each case free and clear of all liens,
     encumbrances and defects except such as are described in the Offering
     Circular or such as do not materially affect the value of such property and
     do not interfere with the use made and proposed to be made of such property
     by the Company and its subsidiaries; and any real property and buildings
     held under lease by the Company and its subsidiaries are held by them under
     valid, subsisting and enforceable leases with such exceptions as are not
     material and do not interfere with the use made and proposed to be made of
     such property and buildings by the Company and its subsidiaries;

          (e)  All of the issued shares of capital stock of the Company have
     been duly and validly authorized and issued and are fully paid and non-
     assessable;

          (f)  The Company has been duly incorporated and is validly existing as
     a corporation in good standing under the laws of Delaware, with power and
     authority (corporate and other) to own its properties and conduct its
     business as described in the Offering Circular, and has been duly qualified
     as a foreign corporation for the transaction of business and is in good
     standing under the laws of each other jurisdiction where the failure to be
     so qualified could be reasonably expected to have a material adverse effect
     on the business, financial condition or results of operations of the
     Company, and each subsidiary of the Company has been duly incorporated and
     is validly existing as a corporation in good standing under the laws of its
     jurisdiction of incorporation;

          (g)  The Securities have been duly authorized and, when issued and
     delivered pursuant to this Agreement, will have been duly executed,
     authenticated, issued and delivered and will constitute valid and legally
     binding obligations of the Company entitled to the benefits provided by the
     Indenture to be dated as of December 1, 1999 (the "Indenture") between the
     Company and Chase Manhattan Bank and Trust Company, National Association,
     as Trustee (the "Trustee"), under which they are to be issued, which will
     be substantially in the form previously delivered to you; and the
     Securities and the Indenture conform to the descriptions thereof in the
     Offering Circular and are in substantially the form previously delivered to
     you;

          (h)  The Indenture has been duly authorized and, when executed and
     delivered by the Company and the Trustee, the Indenture will constitute a
     valid and legally binding instrument, enforceable in accordance with its
     terms, subject as to enforcement to bankruptcy, insolvency, reorganization
     and other laws of general applicability relating to or affecting creditors'
     rights and to general equity principles;

          (i)  That certain Exchange and Registration Rights Agreement among the
     Company and the Purchasers to be dated as of December 1, 1999 (the
     "Registration Rights Agreement") has been duly authorized and, when
     executed and delivered by the

                                       3
<PAGE>

     Company, the Registration Rights Agreement will constitute a valid and
     legally binding instrument, enforceable in accordance with its terms;

          (j)  None of the transactions contemplated by this Agreement
     (including, without limitation, the use of the proceeds from the sale of
     the Securities) will violate or result in a violation of Section 7 of the
     Exchange Act, or any regulation promulgated thereunder, including, without
     limitation, Regulations T, U, and X of the Board of Governors of the
     Federal Reserve System;

          (k)  Prior to the date hereof, neither the Company nor any of its
     affiliates (as such term is defined in Rule 144 promulgated under the
     Securities Act of 1933, as amended (the "Securities Act")) has taken any
     action which is designed to or which has constituted or which might have
     reasonably been expected to cause or result in stabilization or
     manipulation of the price of any security of the Company in connection with
     the offering of the Securities;

          (l)  The issue and sale of the Securities and the compliance by the
     Company with all of the provisions of the Securities, the Indenture, the
     Registration Rights Agreement and this Agreement, and the consummation of
     the transactions herein and therein contemplated will not conflict with or
     result in a breach or violation of any of the terms or provisions of, or
     constitute a default under, any indenture, mortgage, deed of trust, loan
     agreement or other agreement or instrument to which the Company or any of
     its subsidiaries is a party or by which the Company or any of its
     subsidiaries is bound or to which any of the property or assets of the
     Company or any of its subsidiaries is subject, nor will such action result
     in any violation of the provisions of the Certificate of Incorporation or
     By-laws of the Company or any statute or any order, rule or regulation of
     any court or governmental agency or body having jurisdiction over the
     Company or any of its subsidiaries or any of their properties; and no
     consent, approval, authorization, order, registration or qualification of
     or with any such court or governmental agency or body is required for the
     issue and sale of the Securities or the consummation by the Company of the
     transactions contemplated by this Agreement or the Indenture, except the
     filing of a notice on Form D by the Company with the Commission pursuant to
     Section 5(h) hereof and such consents, approvals, authorizations,
     registrations or qualifications as may be required under state securities
     or Blue Sky laws in connection with the purchase and distribution of the
     Securities by the Purchasers;

          (m)  Neither the Company nor any of its subsidiaries is in violation
     of its Certificate of Incorporation or Bylaws or in default in the
     performance or observance of any material obligation, covenant or condition
     contained in any indenture, mortgage, deed of trust, loan agreement, lease
     or other agreement or instrument to which it is a party or by which it or
     any of its properties may be bound;

          (n)  The statements set forth in the Offering Circular under the
     captions "Description of Notes" insofar as they purport to constitute a
     summary of the terms of the Securities,

                                       4
<PAGE>

     the Indenture and the Registration Rights Agreement and under the captions
     "Certain United States Federal Income Tax Considerations" and
     "Underwriting", insofar as they purport to describe the provisions of the
     laws and documents referred to therein, are accurate, complete and fair;

          (o)  Other than as set forth in the Offering Circular, there are no
     legal or governmental proceedings pending to which the Company or any of
     its subsidiaries is a party or of which any property of the Company or any
     of its subsidiaries is the subject which, if determined adversely to the
     Company or any of its subsidiaries, would individually or in the aggregate
     have a material adverse effect on the current or future financial position,
     stockholders' equity or results of operations of the Company and its
     subsidiaries; and, to the Company's knowledge, no such proceedings are
     threatened or contemplated by governmental authorities or threatened by
     others;

          (p)  When the Securities are issued and delivered pursuant to this
     Agreement, the Securities will not be of the same class (within the meaning
     of Rule 144A under the Securities Act) as securities which are listed on a
     national securities exchange registered under Section 6 of the Exchange Act
     or quoted in a U.S. automated inter-dealer quotation system;

          (q)  The Company is subject to Section 13 or 15(d) of the Exchange
Act;

          (r)  The Company is not, and after giving effect to the offering and
     sale of the Securities, will not be an "investment company", as such term
     is defined in the United States Investment Company Act of 1940, as amended
     (the "Investment Company Act");

          (s)  Neither the Company nor any or its subsidiaries, nor any person
     acting on its or their behalf has offered or sold the Securities by means
     of any general solicitation or general advertising within the meaning of
     Rule 502(c) under the Securities Act or, with respect to Securities sold
     outside the United States to  persons who are not U.S. persons (as defined
     in Rule 902 under the Securities Act), by means of any directed selling
     efforts within the meaning of Rule 902 under the Securities Act and the
     Company, any affiliate of the Company and any person acting on its or their
     behalf has complied with and will implement the "offering restrictions"
     within the meaning of such Rule 902, it being understood that the Company
     makes no representations in this clause (s) as to the Purchasers;

          (t)  Within the six months prior to the date hereof, neither the
     Company nor any other person acting on behalf of the Company has offered or
     sold to any person any Securities, or any substantially similar securities
     of the Company, other than Securities offered or sold to the Purchasers
     hereunder. The Company will take reasonable precautions designed to insure
     that any offer or sale, direct or indirect, in the United States or to any
     U.S. person (as defined in Rule 902 under the Securities Act) of any
     Securities or any substantially similar security issued by the Company,
     within six months

                                       5
<PAGE>

     subsequent to the date on which the distribution of the Securities has been
     completed (as notified to the Company by Goldman, Sachs & Co), is made
     under restrictions and other circumstances reasonably designed not to
     affect adversely the status of the offer and sale of the Securities in the
     United States and to U.S. persons contemplated by this Agreement as
     transactions exempt from the registration provisions of the Securities Act;

          (u)  Neither the Company nor any of its affiliates does business with
     the government of Cuba or with any person or affiliate located in Cuba
     within the meaning of Section 517.075, Florida Statutes;

          (v)  KPMG LLP, who have certified certain financial statements of the
     Company and its subsidiaries are independent public accountants as required
     by the Securities Act and the rules and regulations of the Commission
     thereunder;

          (w)  The Company owns or possesses, or can acquire on reasonable
     terms, adequate patents, patent rights, licenses, inventions, copyrights,
     know-how (including trade secrets and other unpatented and/or unpatentable
     proprietary or confidential information, systems or procedures),
     trademarks, service marks, trade names or other intellectual property
     (collectively, "Intellectual Property") necessary to carry on the business
     now operated by it, and the Company has not received any notice of, and is
     not otherwise aware of, any infringement of or conflict with asserted
     rights of others with respect to any Intellectual Property or of any facts
     or circumstances which would render invalid, or otherwise prevent or
     materially inhibit the Company from utilizing, any Intellectual Property
     necessary to carry on the business now conducted by the Company, and which
     infringement or conflict (if the subject of any unfavorable decision,
     ruling or finding), invalidity, prevention or inhibition, singly or in the
     aggregate, is reasonably likely to result in a material adverse change in
     the general affairs, management, financial position, stockholders' equity
     or results of operations of the Company;

          (x)  Except as described in the Offering Circular and except as would
     not, singly or in the aggregate, result in a material adverse change in or
     affecting the general affairs, management, financial position,
     stockholders' equity or results of operations of the Company, (A) the
     Company is not in violation of any federal, state, local or foreign
     statute, law, rule, regulation, ordinance, code, policy or rule of common
     law or any judicial or administrative interpretation thereof, including any
     judicial or administrative order, consent, decree or judgment, relating to
     pollution or protection of human health, the environment (including,
     without limitation, ambient air, surface water, groundwater, land surface
     or subsurface strata) or wildlife, including, without limitation, laws and
     regulations relating to the release or threatened release of chemicals,
     pollutants, contaminants, wastes, toxic substances, hazardous substances,
     petroleum or petroleum products (collectively "Hazardous Materials") or to
     the manufacture, processing, distribution, use, treatment, storage,
     disposal, transport or handling of Hazardous Materials (collectively,
     "Environmental Laws"), (B) the Company has all permits, authorizations and
     approvals required under any applicable Environmental Laws and is in
     compliance with their

                                       6
<PAGE>

     requirements, (C) there are no pending or, to the best of the Company's
     knowledge, threatened administrative, regulatory or judicial action, suits,
     demands, demand letters, claims, liens, notices of noncompliance or
     violation, investigation or proceedings relating to any Environmental Law
     against the Company and (D) to the best of the Company's knowledge, there
     are no events or circumstances that might reasonably be expected to form
     the basis of an order for clean-up or remediation, or an action, suit or
     proceeding by any private party or government body or agency, against or
     affecting the Company relating to Hazardous Materials or any Environmental
     Laws;

          (y)  The Company has reviewed its operations and that of its
     subsidiaries and any third parties with which the Company or any of its
     subsidiaries has a material relationship to evaluate the extent to which
     the business or operations of the Company or any of its subsidiaries will
     be affected by the Year 2000 Problem.  Based on such review, the Company
     has no reason to believe, and does not believe, that the Year 2000 Problem
     will have a material adverse effect on the general affairs, management, the
     current or future consolidated financial position, stockholders' equity or
     results of operations of the Company and its subsidiaries or result in any
     material loss or interference with the Company's business or operations.
     The "Year 2000 Problem" as used herein means any significant risk that
     computer hardware or software used in the receipt, transmission,
     processing, manipulation, storage, retrieval, retransmission or other
     utilization of data or in the operation of mechanical or electrical systems
     of any kind will not, in the case of dates or time periods occurring after
     December 31, 1999, function at least as effectively as in the case of dates
     or time periods occurring prior to January 1, 2000;

          (z)  Neither the Company nor any of its affiliates nor any person
     acting on its behalf (other than the Purchasers, as to whom the Company
     makes no representation) has engaged or will engage in any directed selling
     efforts within the meaning of Regulation S with respect to the Securities;

          (aa) The Company and its affiliates and all persons acting on its
     behalf (other than the Purchasers, as to whom the  Company makes no
     representation) have complied in all material respects with the offering
     restrictions requirements of Regulation S in connection with the offering
     of the Securities outside the United States and, in connection therewith,
     the Offering Circular contains the disclosure required by Rule 902(h)(2)
     under the Securities Act; and

          (bb) The Company is a "reporting issuer," as defined in Rule 902(l)
     under the Securities Act.

     2.   (a)  Subject to the terms and conditions herein set forth, the Company
agrees to issue and sell to each of the Purchasers, and each of the Purchasers
agrees, severally and not jointly, to purchase from the Company, at a purchase
price of 97.25% of the principal amount

                                       7
<PAGE>

thereof, plus accrued interest, if any, from December 8, 1999 to the Time of
Delivery hereunder, the principal amount of Securities set forth opposite the
name of such Purchaser in Schedule I hereto.

          (b)  The Company may offer and sell such dollar-denominated senior
          notes in an aggregate principal amount not to exceed $100,000,000,
          (the "Additional Securities") within one year of the Time of Delivery
          and upon written notice to Goldman, Sachs & Co. of its intention to
          issue such Additional Securities; provided, however, that the Company
                                            --------  -------
          shall have entered into a purchase agreement on substantially similar
          terms and conditions as this Agreement and an Exchange and
          Registration Rights Agreement on substantially similar terms and
          conditions as the Registration Rights Agreement, in each case, with
          Goldman, Sachs & Co. (or such other underwriter as the Company shall
          choose in the event that Goldman, Sachs & Co. shall decline the
          representation of the Company in such offering) and such other of the
          Purchasers as the Company and Goldman, Sachs & Co. shall mutually
          agree upon for the sale and issuance of the Additional Securities. The
          purchase price for any such Additional Securities shall be equal to
          the then current market price of the Dollar Securities less an initial
          purchaser's discount equal to 2.75% of the principal amount of such
          Additional Securities or such other percentage as shall be reasonably
          acceptable to Goldman, Sachs & Co and the Company. Holders of
          Additional Securities shall be entitled to receive an interest payment
          equal to the holders of the Dollar Securities, on a percentage basis,
          on all Interest Payment Dates (as defined in the Indenture) occurring
          after the date of issuance of such Additional Securities.

     3.   Upon the authorization by Goldman, Sachs & Co. of the release of the
Securities, the several Purchasers propose to offer the Securities for sale upon
the terms and conditions set forth in this Agreement and the Offering Circular
and each Purchaser hereby represents and warrants to, and agrees with, the
Company that:

          (a)  It will offer and sell the Securities only to: (i) persons which
     it reasonably believes are "qualified institutional buyers" ("QIBs") within
     the meaning of Rule 144A under the Securities Act in transactions meeting
     the requirements of Rule 144A or, (ii) upon the terms and conditions set
     forth in Annex I to this Agreement;

          (b)  Upon request of the Company, it will notify the Company upon
     completion of the distribution of the Securities;

          (c)  It is an Institutional Accredited Investor; and

          (d)  It has not offered and will not offer or sell the Securities by
     any form of general solicitation or general advertising, including but not
     limited to the methods described in Rule 502(c) under the Securities Act.

                                       8
<PAGE>

     4.   (a)  The Securities to be purchased by each Purchaser hereunder will
be represented by one or more definitive Securities in book-entry form which
will be deposited by or on behalf of the Company to Goldman, Sachs & Co. with
The Depository Trust Company ("DTC") or other appropriate depository for the
account of such purchaser, or its designated custodian.  The Company will
deliver the Securities to Goldman, Sachs & Co. for the account of each Purchaser
against payment by or on behalf of such Purchaser of the purchase price therefor
by wire transfer, payable to the order of the Company in Federal (or other same
day) funds, by causing DTC or other appropriate depository to credit the
Securities to the account of Goldman, Sachs & Co. at DTC or other appropriate
depository.  The Company will cause the certificates representing the Securities
to be made available to Goldman, Sachs & Co. for checking at least twenty-four
hours prior to the Time of Delivery (as defined below) at the office of DTC or
its designated custodian (the "Designated Office") or at another place
designated by Goldman, Sachs & Co.  The time and date of such delivery and
payment shall be 9:30 a.m., New York City time, on December 8, 1999 or such
other time and date as Goldman, Sachs & Co. and the Company may agree upon in
writing.  Such time and date are herein called the "Time of Delivery".

          (b)  The documents to be delivered at the Time of Delivery by or on
     behalf of the parties hereto pursuant to Section 7 hereof, including the
     cross-receipt for the Securities and any additional documents requested by
     the Purchasers pursuant to Section 7(h) hereof, will be delivered at such
     time and date at the offices of Fenwick & West LLP, Two Palo Alto Square,
     Palo Alto, California 94306 (the "Closing Location"), and the Securities
     will be delivered at the Designated Office, all at the Time of Delivery.  A
     meeting will be held at the Closing Location at 6:00 p.m., New York City
     time, on the New York Business Day next preceding the Time of Delivery, at
     which meeting the final drafts of the documents to be delivered pursuant to
     the preceding sentence will be available for review by the parties hereto.
     For the purposes of this Section 4, "New York Business Day" shall mean each
     Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which
     banking institutions in New York are generally authorized or obligated by
     law or executive order to close.

     5.   The Company agrees with each of the Purchasers:

          (a)  To prepare the Offering Circular in a form approved by you; to
     make no amendment or any supplement to the Offering Circular which shall be
     disapproved by you promptly after reasonable notice thereof; and to furnish
     you with copies thereof;

          (b)  Promptly from time to time to take such action as you may
     reasonably request to qualify the Securities for offering and sale under
     the securities laws of such jurisdictions as you may request and to comply
     with such laws so as to permit the continuance of sales and dealings
     therein in such jurisdictions for as long as may be necessary to complete
     the distribution of the Securities, provided that in connection therewith
     the Company shall not be required to qualify as a foreign corporation or to
     file a general consent to service of process in any jurisdiction;

                                       9
<PAGE>

          (c)  To furnish the Purchasers with four copies of the Offering
     Circular and each amendment or supplement thereto signed by an authorized
     officer of the Company and with the independent accountants' report(s) in
     the Offering Circular, and any amendment or supplement containing
     amendments to the financial statements covered by such report(s),  signed
     by the accountants, and additional copies thereof in such quantities as you
     may from time to time reasonably request, and if, at any time prior to the
     expiration of nine months after the date of the Offering Circular, any
     event shall have occurred as a result of which the Offering Circular as
     then amended or supplemented would include an untrue statement of a
     material fact or omit to state any material fact necessary in order to make
     the statements therein, in the light of the circumstances under which they
     were made when such Offering Circular is delivered, not misleading, or, if
     for any other reason it shall be necessary or desirable during such same
     period to amend or supplement the Offering Circular, to notify you and upon
     your request to prepare and furnish without charge to each Purchaser and to
     any dealer in securities as many copies as you may from time to time
     reasonably request of an amended Offering Circular or a supplement to the
     Offering Circular which will correct such statement or omission or effect
     such compliance;

          (d)  During the period beginning from the date hereof and continuing
     until the date six months after the Time of Delivery, not to offer, sell,
     contract to sell or otherwise dispose of, except as provided hereunder any
     securities of the Company that are substantially similar to the Securities
     (other than Additional Securities);

          (e)  Not to be or become, at any time prior to the expiration of three
     years after the Time of Delivery, an open-end investment company, unit
     investment trust, closed-end investment company or face-amount certificate
     company that is or is required to be registered under Section 8 of the
     Investment Company Act;

          (f)  At any time when the Company is not subject to Section 13 or
     15(d) of the Exchange Act, for the benefit of holders from time to time of
     Securities, to furnish at its expense, upon request, to holders of
     Securities and prospective purchasers of securities information (the
     "Additional Issuer Information") satisfying the requirements of subsection
     (d)(4)(i) of Rule 144A under the Securities Act;

          (g)  If requested by you, to use its best efforts to cause (i) the
     Dollar Securities to be eligible for the PORTAL trading system of the
     National Association of Securities Dealers, Inc. and (ii) the Euro
     Securities to be eligible for listing on the Luxembourg Stock Exchange;

          (h)  To file with the Commission, not later than 15 days after the
     Time of Delivery, five copies of a notice on Form D under the Securities
     Act (one of which will be manually signed by a person duly authorized by
     the Company); to otherwise comply with the requirements of Rule 503 under
     the Securities Act; and to furnish promptly to you evidence of each such
     required timely filing (including a copy thereof);

                                       10
<PAGE>

          (i) To furnish to the holders of the Securities as soon as practicable
     after the end of each fiscal year an annual report (including a balance
     sheet and statements of income, stockholders' equity and cash flows of the
     Company and its consolidated subsidiaries certified by independent public
     accountants) and, as soon as practicable after the end of each of the first
     three quarters of each fiscal year (beginning with the fiscal quarter
     ending after the date of the Offering Circular), consolidated summary
     financial information of the Company and its subsidiaries for such quarter
     in reasonable detail;

     (j) During a period of five years from the date of the Offering Circular,
to furnish to you copies of all reports or other communications (financial or
other) furnished to stockholders of the Company, and to deliver to you (i) as
soon as they are available, copies of any reports and financial statements
furnished to or filed with the Commission or any securities exchange on which
the Securities or any class of securities of the Company is listed; and (ii)
such additional information concerning the business and financial condition of
the Company as you may from time to time reasonably request (such financial
statements to be on a consolidated basis to the extent the accounts of the
Company and its subsidiaries are consolidated in reports furnished to its
stockholders generally or to the Commission) provided that you agree to hold in
confidence any confidential or non-public information so provided;

     (k) The Company agrees that, to the extent required under the Senior Notes
Indenture (as defined below), it will use the net proceeds of the sale of the
Securities to finance the purchase or other acquisition of any property,
inventory, asset or business directly or indirectly, by the Company or any
Restricted Subsidiary used in, or to be used in, the System and Network
Management Business or for such other purposes permitted by the Senior Notes
Indenture (as defined below). Neither the Company nor any of its Restricted
Subsidiaries has, as of the date hereof, incurred any Debt under Section
1008(11) of the Senior Notes Indenture. "Debt" has the meaning given thereto in
the Senior Notes Indenture. "Restricted Subsidiary" shall mean any subsidiary of
the Company that has not been designated an "Unrestricted Subsidiary" pursuant
to the Indenture dated as of July 1, 1998 between the Company and the Chase
Manhattan Bank and Trust Company, National Association, as trustee governing the
Company's 11 1/4% Senior Notes due 2008 (as amended or supplemented from time to
time, the "Senior Notes Indenture"). "System and Network Management Business"
means: (i) server and other hardware hosting; (ii) connectivity, data
networking, telecommunications or content for computer or data networks or
systems; (iii) management of computer or data networks or systems; (iv)
technology services, equipment sales or leasing or software licensing for
computer or data networks or systems (including Internet Protocol and any
successor protocol(s) based networks); and (v) businesses reasonably related,
complementary or incidental thereto;

     (l) The Company and its affiliates and all persons acting on its behalf
(other than the Purchasers, as to whom the Company makes no representation) will
comply in all material respects with the offering restrictions requirements of
Regulation S in connection with the offering of the Securities outside the
United States.

                                       11
<PAGE>

     6.   The Company covenants and agrees with the several Purchasers that the
Company will pay or cause to be paid the following: (i) the fees, disbursements
and expenses of the Company's counsel and accountants in connection with the
issue of the Securities and all other expenses in connection with the
preparation, printing and filing of the Preliminary Offering Circular and the
Offering Circular and any amendments and supplements thereto and the mailing and
delivering of copies thereof to the Purchasers and dealers; (ii) the cost of
printing or producing this Agreement, any Agreement among Purchasers, the
Indenture, the Blue Sky and Legal Investment Memoranda, closing documents
(including any compilations thereof) and any other documents in connection with
the offering, purchase, sale and delivery of the Securities; (iii) all expenses
in connection with the qualification of the Securities for offering and sale
under state securities laws as provided in Section 5(b) hereof, including the
fees and disbursements of counsel for the Purchasers in connection with such
qualification and in connection with the Blue Sky and legal investment surveys;
(iv) any fees charged by securities rating services for rating the Securities;
(v) the cost of preparing the Securities; (vi) the fees and expenses of the
Trustee and any agent of the Trustee and the fees and disbursements of counsel
for the Trustee in connection with the Indenture and the Securities; (vii) any
cost incurred in connection with the designation of the Dollar Securities for
trading in PORTAL and the listing of the Euro Securities on the Luxembourg Stock
Exchange; and (viii) all other costs and expenses incident to the performance of
its obligations hereunder which are not otherwise specifically provided for in
this Section.  It is understood, however, that, except as provided in this
Section, and Sections 8 and 11 hereof, the Purchasers will pay all of their own
costs and expenses, including the fees of their counsel, transfer taxes on
resale of any of the Securities by them, and any advertising expenses connected
with any offers they may make.

      7.  The obligations of the Purchasers hereunder shall be subject, in their
discretion, to the condition that all representations and warranties and other
statements of the Company herein are, at and as of the Time of Delivery, true
and correct, the condition that the Company shall have performed all of its
obligations hereunder theretofore to be performed, and the following additional
conditions:

          (a)  Wilson Sonsini Goodrich & Rosati, Professional Corporation,
     counsel for the Purchasers, shall have furnished to you such opinion or
     opinions, dated the Time of Delivery, with respect to the matters covered
     in paragraphs (i), (ii), (vi), (vii), (viii), (xii), (xiii), (xiv) and (xv)
     of subsection (b) below as well as such other related matters as you may
     reasonably request, and such counsel shall have received such papers and
     information as they may reasonably request to enable them to pass upon such
     matters;

          (b)  Fenwick & West LLP, counsel for the Company, (or such other
     counsel as the Company shall deem appropriate and which shall be reasonably
     acceptable to Goldman, Sachs & Co.) shall have furnished to you their
     written opinion, dated the Time of Delivery, in form and substance
     satisfactory to you, to the effect that:

               (i)  The Company has been duly incorporated and is validly
          existing as a corporation in good standing under the laws of the State
          of Delaware, with

                                       12
<PAGE>

          corporate power and corporate authority to own its properties and
          conduct its business as described in the Offering Circular;

               (ii)  The Company had, as of the dates specified in the Offering
          Circular, duly authorized capital stock as set forth under the caption
          "Capitalization" in the Offering Circular, and all of the issued and
          outstanding shares of capital stock of the Company described therein
          have been duly and validly authorized and issued, are non-assessable
          and to such counsel's knowledge, are fully paid;

               (iii) The Company has been duly qualified as a foreign
          corporation for the transaction of business and is in good standing
          under the laws of each jurisdiction within the United States in which
          it owns or leases properties or employs personnel, where the failure
          to be so qualified would have a material adverse effect on the
          business, financial condition or results of operations of the Company;

               (iv)  Each significant subsidiary of the Company has been duly
          incorporated and is validly existing as a corporation in good standing
          under the laws of its jurisdiction of incorporation; and all of the
          issued shares of capital stock of each such significant subsidiary
          have been duly and validly authorized and issued, are fully paid and
          non-assessable, and (except for directors' qualifying shares and
          except as otherwise set forth in the Offering Circular) are owned
          directly or indirectly by the Company, free and clear of all liens,
          encumbrances, equities or claims (such counsel being entitled to rely
          in respect of the opinion in this clause upon opinions of local
          counsel and in respect of matters of fact upon certificates of
          officers of the Company or its significant subsidiaries);

               (v)   To such counsel's knowledge and other than as set forth in
          the Offering Circular, there are no legal or governmental proceedings
          pending to which the Company or any of its significant subsidiaries is
          a party or of which any property of the Company or any of its
          significant subsidiaries is the subject which, if determined adversely
          to the Company or any of its significant subsidiaries, would
          individually or in the aggregate have a material adverse effect on the
          current or future consolidated financial position, stockholders'
          equity or results of operations of the Company and its significant
          subsidiaries; and, to such counsel's knowledge, no such proceedings
          are threatened by governmental authorities or threatened by others;

               (vi)  This Agreement has been duly authorized, executed and
          delivered by the Company to you;

               (vii) The Securities have been duly authorized, executed,
          authenticated, issued and delivered and constitute valid and legally
          binding obligations of the Company;

                                       13
<PAGE>

               (viii) The Indenture and the Registration Rights Agreement have
          been duly authorized, executed and delivered by the Company and
          constitute valid and legally binding instruments, enforceable in
          accordance with their respective terms, subject, as to enforcement, to
          bankruptcy, insolvency, reorganization and other laws of general
          applicability relating to or affecting creditors' rights and to
          general equity principles;

               (ix)   The issue and sale of the Securities being delivered at
          the Time of Delivery and the compliance by the Company with all of the
          provisions of the Securities, the Indenture, this Agreement and the
          Registration Rights Agreement and the consummation of the transactions
          herein and therein contemplated were they to be completed on or prior
          to the date of such opinion and assuming the absence of any applicable
          cure period, waiting period or other similar provision, do not
          conflict with or result in a breach or violation of any of the terms
          or provisions of, or constitute a default under, any of the agreements
          filed as exhibits to the Company's or any of its significant
          subsidiaries' Annual Report filed on form 10-K for the year ended
          December 31, 1998, or to any Exchange Act Report or any agreements
          entered into by the Company or any of its significant subsidiaries
          after September 30, 1999 that would be required to be filed as a
          material agreement exhibit on Form 10-Q or any other Exchange Act
          Report (in each case, a "Material Agreement") (provided that in
          determining which documents would be required to be so filed, such
          counsel may rely on an officer's certificate that specifies agreements
          that the Company or any of its significant subsidiaries has entered
          into since September 30, 1999) nor does such action result in any
          violation of the provisions of the Certificate of Incorporation or
          Bylaws of the Company or any of its significant subsidiaries or any
          statute or any order, rule or regulation known to such counsel of any
          court or governmental agency or body having jurisdiction over the
          Company or any of its significant subsidiaries or any of their
          properties;

               (x)    No consent, approval, authorization, order, registration
          or qualification of or with any United States court or United States
          governmental agency or United States body is required for the issue
          and sale of the Securities or the consummation by the Company of the
          transactions contemplated by this Agreement, the Indenture or the
          Registration Rights Agreement, except (A) such consents, approvals,
          authorizations, orders, registrations or qualifications as may be
          required under state securities or Blue Sky laws in connection with
          the purchase and distribution of the Securities by the Purchasers (as
          to which such counsel renders no opinion) or (B) such consents,
          approvals, authorizations, orders, registrations or qualifications as
          are referenced in the Offering Circular;

               (xi)   Neither the Company nor any of its significant
          subsidiaries is in violation of its Certificate of Incorporation or
          Bylaws or, to such counsel's knowledge, in default in the performance
          or observance of any material obligation, agreement, covenant or
          condition contained in any Material Agreement;

                                       14
<PAGE>

               (xii)  The statements set forth in the Offering Circular insofar
          as they purport to constitute a summary of the terms of the
          Securities, the Indenture and the Registration Rights Agreement, and
          under the captions "Certain United States Federal Income Tax
          Considerations" and "Underwriting," insofar as they purport to
          describe the provisions of the laws and documents referred to therein,
          are accurate and complete in all material respects;

               (xiii) The Exchange Act Reports (other than the financial
          statements and related notes and schedules (and financial data)
          therein, as to which such counsel need express no opinion), when they
          were filed with the Commission, complied as to form in all material
          respects with the requirements of the Exchange Act, and the rules and
          regulations of the Commission promulgated thereunder;

               (xiv)  No registration of the Securities under the Securities
          Act, and no qualification of an indenture under the Trust Indenture
          Act of 1939 with respect thereto, is required for the offer and sale
          to, and initial resale of the Securities by, the Purchasers in the
          manner contemplated by this Agreement; and

               (xv)   The Company is not an "investment company," as such term
          is defined in the Investment Company Act.

               In addition, such counsel shall state that, although they are not
          passing upon and do not assume any responsibility for, nor have they
          independently verified, the accuracy, completeness or fairness of the
          statements contained in the Preliminary Offering Circular and the
          Offering Circular, except for and to the extent of those referred to
          in the opinion in subsection (xii) of this Section 7(b),  they have
          participated in certain conferences with officers and other employees
          of the Company, representatives of the Company's independent certified
          public accountants and representatives of the Purchasers with respect
          to the preparation of the Preliminary Offering Circular and the
          Offering Circular, and no facts have come to the attention of
          attorneys devoting attention to the representation of the Company in
          its preparation of the Preliminary Offering Circular and the Offering
          Circular that have caused them to believe that, as of their respective
          dates and as of the Time of Delivery, the Preliminary Offering
          Circular and the Offering Circular or any further amendments thereto
          made by the Company prior to such Time of Delivery (other than the
          financial statements and related notes, related schedules and
          financial data included therein, as to which such counsel need express
          no opinion) contained an untrue statement of a material fact or
          omitted to state a material fact required to be stated therein or
          necessary to make the statements therein, in light of the
          circumstances under which they were made, not misleading. Further,
          such counsel shall state that, although they are not passing upon and
          do not assume any responsibility for, nor have they independently
          verified, the accuracy, completeness or fairness of the statements
          contained in the Exchange Act Reports, they have participated in
          certain conferences with officers and other

                                       15
<PAGE>

          employees of the Company, and representatives of the Company's
          independent certified public accountants with respect to the
          preparation of the respective Exchange Act Reports, and no facts have
          come to the attention of attorneys devoting attention to the
          representation of the Company in its preparation of the respective
          Exchange Act Reports that have caused them to believe that as of the
          dates on which the respective Exchange Act Reports were filed with the
          Commission, the Exchange Act Reports (other than the financial
          statements and related notes, related schedules and financial data
          included therein, as to which such counsel need express no opinion)
          contained an untrue statement of material fact or omitted to state a
          material fact required to be stated therein or necessary to make the
          statements therein, in light of the circumstances under which they
          were made when such documents were so filed, not misleading.

          (c)  On the date of the Offering Circular prior to the execution of
     this Agreement and also at the Time of Delivery, KPMG LLP shall have
     furnished to you a letter or letters, dated the respective dates of
     delivery thereof, in form and substance satisfactory to you, to the effect
     set forth in Annex II hereto;

          (d)  (i) Neither the Company nor any of its subsidiaries shall have
     sustained since the date of the latest audited financial statements
     included in the Offering Circular any loss or interference with its
     business from fire, explosion, flood or other calamity, whether or not
     covered by insurance, or from any labor dispute or court or governmental
     action, order or decree, otherwise than as set forth or contemplated in the
     Offering Circular, and (ii) since the respective dates as of which
     information is given in the Offering Circular there shall not have been any
     change in the capital stock or long-term debt of the Company or any of its
     subsidiaries or any change, or any development involving a prospective
     change, in or affecting the general affairs, management, financial
     position, stockholders' equity or results of operations of the Company and
     its subsidiaries, otherwise than as set forth or contemplated in the
     Offering Circular, the effect of which, in any such case described in
     Clause (i) or (ii), is in the judgment of the Purchasers so material and
     adverse as to make it impracticable or inadvisable to proceed with the
     public offering or the delivery of the Securities on the terms and in the
     manner contemplated in this Agreement and  in the Offering Circular;

          (e)  On or after the date hereof (i) no downgrading shall have
     occurred in the rating accorded the Company's debt securities by any
     "nationally recognized statistical rating organization", as that term is
     defined by the Commission for purposes of Rule 436(g)(2) under the
     Securities Act, and (ii) no such organization shall have publicly announced
     that it has under surveillance or review, with possible negative
     implications, its rating of any of the Company's debt securities;

          (f)  On or after the date hereof there shall not have occurred any of
     the following: (i) a suspension or material limitation in trading in
     securities generally on the New York Stock Exchange; or on NASDAQ; (ii) a
     suspension or material limitation in

                                       16
<PAGE>

     trading in the Company's securities on NASDAQ; (iii) a general moratorium
     on commercial banking activities declared by either Federal or New York or
     California State authorities; (iv) the outbreak or escalation of
     hostilities involving the United States or the declaration by the United
     States of a national emergency or war, if the effect of any such event
     specified in this Clause (iv) in the judgment of the Purchasers makes it
     impracticable or inadvisable to proceed with the public offering or the
     delivery of the Securities on the terms and in the manner contemplated in
     the Offering Circular; or (v) the occurrence of any material adverse change
     in the existing financial, political or economic conditions in the United
     States or elsewhere which, in the judgment of the Purchasers, would
     materially and adversely affect the financial markets or markets for the
     Securities or other debt securities;

          (g)  The Dollar Securities have been designated for trading on PORTAL;

          (h)  The Company shall have furnished to you executed copies of the
     Indenture and the Registration Rights Agreement; and

          (i)  The Company shall have furnished or caused to be furnished to you
     at the Time of Delivery certificates of officers of the Company
     satisfactory to you as to the accuracy of the representations and
     warranties of the Company herein at and as of such Time of Delivery, as to
     the performance by the Company of all of its obligations hereunder to be
     performed at or prior to such Time of Delivery, as to the matters set forth
     in subsection (d) of this Section and as to such other matters as you may
     reasonably request.

     8.   (a)  The Company will indemnify and hold harmless each Purchaser
against any losses, claims, damages or liabilities, joint or several, to which
such Purchaser may become subject, under the Securities Act or otherwise,
insofar as such losses, claims, damages or liabilities (or actions in respect
thereof) arise out of or are based upon an untrue statement or alleged untrue
statement of a material fact contained in the Preliminary Offering Circular or
the Offering Circular, or any amendment or supplement thereto, or arise out of
or are based upon the omission or alleged omission to state therein a material
fact necessary to make the statements therein not misleading, and will reimburse
each Purchaser for any legal or other expenses reasonably incurred by such
Purchaser in connection with investigating or defending any such action or claim
as such expenses are incurred; provided, however, that the Company shall not be
liable in any such case to the extent that any such loss, claim, damage or
liability arises out of or is based upon an untrue statement or alleged untrue
statement or omission or alleged omission made in the Preliminary Offering
Circular or the Offering Circular or any such amendment or supplement in
reliance upon and in conformity with written information furnished to the
Company by any Purchaser through Goldman, Sachs & Co. expressly for use therein.

          (b)  Each Purchaser will indemnify and hold harmless the Company
     against any losses, claims, damages or liabilities to which the Company may
     become subject, under the Securities Act or otherwise, insofar as such
     losses, claims, damages or liabilities (or

                                       17
<PAGE>

     actions in respect thereof) arise out of or are based upon an untrue
     statement or alleged untrue statement of a material fact contained in the
     Preliminary Offering Circular or the Offering Circular, or any amendment or
     supplement thereto, or arise out of or are based upon the omission or
     alleged omission to state therein a material fact or necessary to make the
     statements therein not misleading, in each case to the extent, but only to
     the extent, that such untrue statement or alleged untrue statement or
     omission or alleged omission was made in the Preliminary Offering Circular
     or the Offering Circular or any such amendment or supplement in reliance
     upon and in conformity with written information furnished to the Company by
     such Purchaser through Goldman, Sachs & Co. expressly for use therein; and
     will reimburse the Company for any legal or other expenses reasonably
     incurred by the Company in connection with investigating or defending any
     such action or claim as such expenses are incurred.

          (c)  Promptly after receipt by an indemnified party under subsection
     (a) or (b) above of notice of the commencement of any action, such
     indemnified party shall, if a claim in respect thereof is to be made
     against the indemnifying party under such subsection, notify the
     indemnifying party in writing of the commencement thereof; but the omission
     so to notify the indemnifying party shall not relieve it from any liability
     which it may have to any indemnified party otherwise than under such
     subsection.  In case any such action shall be brought against any
     indemnified party and it shall notify the indemnifying party of the
     commencement thereof, the indemnifying party shall be entitled to
     participate therein and, to the extent that it shall wish, jointly with any
     other indemnifying party similarly notified, to assume the defense thereof,
     with counsel satisfactory to such indemnified party (who shall not, except
     with the consent of the indemnified party, be counsel to the indemnifying
     party), and, after notice from the indemnifying party to such indemnified
     party of its election so to assume the defense thereof, the indemnifying
     party shall not be liable to such indemnified party under such subsection
     for any legal expenses of other counsel or any other expenses, in each case
     subsequently incurred by such indemnified party, in connection with the
     defense thereof other than reasonable costs of investigation.  No
     indemnifying party shall, without the written consent of the indemnified
     party, effect the settlement or compromise of, or consent to the entry of
     any judgment with respect to, any pending or threatened action or claim in
     respect of which indemnification or contribution may be sought hereunder
     (whether or not the indemnified party is an actual or potential party to
     such action or claim) unless such settlement, compromise or judgment (i)
     includes an unconditional release of the indemnified party from all
     liability arising out of such action or claim and (ii) does not include a
     statement as to, or an admission of, fault, culpability or a failure to
     act, by or on behalf of any indemnified party.

          (d)  If the indemnification provided for in this Section 8 is
     unavailable to or insufficient to hold harmless an indemnified party under
     subsection (a) or (b) above in respect of any losses, claims, damages or
     liabilities (or actions in respect thereof) referred to therein, then each
     indemnifying party shall contribute to the amount paid or payable by such
     indemnified party as a result of such losses, claims, damages or
     liabilities (or actions

                                       18
<PAGE>

     in respect thereof) in such proportion as is appropriate to reflect the
     relative benefits received by the Company on the one hand and the
     Purchasers on the other from the offering of the Securities. If, however,
     the allocation provided by the immediately preceding sentence is not
     permitted by applicable law or if the indemnified party failed to give the
     notice required under subsection (c) above, then each indemnifying party
     shall contribute to such amount paid or payable by such indemnified party
     in such proportion as is appropriate to reflect not only such relative
     benefits but also the relative fault of the Company on the one hand and the
     Purchasers on the other in connection with the statements or omissions
     which resulted in such losses, claims, damages or liabilities (or actions
     in respect thereof), as well as any other relevant equitable
     considerations. The relative benefits received by the Company on the one
     hand and the Purchasers on the other shall be deemed to be in the same
     proportion as the total net proceeds from the offering (before deducting
     expenses) received by the Company bear to the total underwriting discounts
     and commissions received by the Purchasers, in each case as set forth in
     the Offering Circular. The relative fault shall be determined by reference
     to, among other things, whether the untrue or alleged untrue statement of a
     material fact or the omission or alleged omission to state a material fact
     relates to information supplied by the Company on the one hand or the
     Purchasers on the other and the parties' relative intent, knowledge, access
     to information and opportunity to correct or prevent such statement or
     omission. The Company and the Purchasers agree that it would not be just
     and equitable if contribution pursuant to this subsection (d) were
     determined by pro rata allocation (even if the Purchasers were treated as
     one entity for such purpose) or by any other method of allocation which
     does not take account of the equitable considerations referred to above in
     this subsection (d). The amount paid or payable by an indemnified party as
     a result of the losses, claims, damages or liabilities (or actions in
     respect thereof) referred to above in this subsection (d) shall be deemed
     to include any legal or other expenses reasonably incurred by such
     indemnified party in connection with investigating or defending any such
     action or claim. Notwithstanding the provisions of this subsection (d), no
     Purchaser shall be required to contribute any amount in excess of the
     amount by which the total price at which the Securities underwritten by it
     and distributed to investors were offered to investors exceeds the amount
     of any damages which such Purchaser has otherwise been required to pay by
     reason of such untrue or alleged untrue statement or omission or alleged
     omission. The Purchasers' obligations in this subsection (d) to contribute
     are several in proportion to their respective underwriting obligations and
     not joint.

          (e)  The obligations of the Company under this Section 8 shall be in
     addition to any liability which the Company may otherwise have and shall
     extend, upon the same terms and conditions, to each person, if any, who
     controls any Purchaser within the meaning of the Act; and the obligations
     of the Purchasers under this Section 8 shall be in addition to any
     liability which the respective Purchasers may otherwise have and shall
     extend, upon the same terms and conditions, to each officer and director of
     the Company and to each person, if any, who controls the Company within the
     meaning of the Securities Act.

                                       19
<PAGE>

     9.   (a)  If any Purchaser shall default in its obligation to purchase the
Securities which it has agreed to purchase hereunder, you may in your discretion
arrange for you or another party or other parties to purchase such Securities on
the terms contained herein.  If within thirty-six hours after such default by
any Purchaser you do not arrange for the purchase of such Securities, then the
Company shall be entitled to a further period of thirty-six hours within which
to procure another party or other parties satisfactory to you to purchase such
Securities on such terms.  In the event that, within the respective prescribed
periods, you notify the Company that you have so arranged for the purchase of
such Securities, or the Company notifies you that it has so arranged for the
purchase of such Securities, you or the Company shall have the right to postpone
the Time of Delivery for a period of not more than  seven days, in order to
effect whatever changes may thereby be made necessary in the Offering Circular,
or in any other documents or arrangements, and the Company agrees to prepare
promptly any amendments to the Offering Circular which in your opinion may
thereby be made necessary.  The term "Purchaser" as used in this Agreement shall
include any person substituted under this Section with like effect as if such
person had originally been a party to this Agreement with respect to such
Securities.

          (b)  If, after giving effect to any arrangements for the purchase of
     the Securities of a defaulting Purchaser or Purchasers by you and the
     Company as provided in subsection (a) above, the aggregate principal amount
     of such Securities which remains unpurchased does not exceed one-eleventh
     of the aggregate principal amount of all the Securities, then the Company
     shall have the right to require each non-defaulting Purchaser to purchase
     the principal amount of Securities which such Purchaser agreed to purchase
     hereunder and, in addition, to require each non-defaulting Purchaser to
     purchase its pro rata share (based on the principal amount of Securities
     which such Purchaser agreed to purchase hereunder) of the Securities of
     such defaulting Purchaser or Purchasers for which such arrangements have
     not been made; but nothing herein shall relieve a defaulting Purchaser from
     liability for its default.

          (c)  If, after giving effect to any arrangements for the purchase of
     the Securities of a defaulting Purchaser or Purchasers by you and the
     Company as provided in subsection (a) above, the aggregate principal amount
     of Securities which remains unpurchased exceeds one-eleventh of the
     aggregate principal amount of all the Securities, or if the Company shall
     not exercise the right described in subsection (b) above to require non-
     defaulting Purchasers to purchase Securities of a defaulting Purchaser or
     Purchasers, then this Agreement shall thereupon terminate, without
     liability on the part of any non-defaulting Purchaser or the Company,
     except for the expenses to be borne by the Company and the Purchasers as
     provided in Section 6 hereof and the indemnity and contribution agreements
     in Section 8 hereof; but nothing herein shall relieve a defaulting
     Purchaser from liability for its default.

     10.  The respective indemnities, agreements, representations, warranties
and other statements of the Company and the several Purchasers, as set forth in
this Agreement or made by or on behalf of them, respectively, pursuant to this
Agreement, shall remain in full force and

                                       20
<PAGE>

effect, regardless of any investigation (or any statement as to the results
thereof) made by or on behalf of any Purchaser or any controlling person of any
Purchaser, or the Company, or any officer or director or controlling person of
the Company, and shall survive delivery of and payment for the Securities.

     11.  If this Agreement shall be terminated pursuant to Section 9 hereof,
the Company shall not then be under any liability to any Purchaser except as
provided in Sections 6 and 8 hereof; but, if for any other reason, the
Securities are not delivered by or on behalf of the Company as provided herein,
the Company will reimburse the Purchasers through you for all out-of-pocket
expenses approved in writing by you, including fees and disbursements of
counsel, reasonably incurred by the Purchasers in making preparations for the
purchase, sale and delivery of the Securities, but the Company shall then be
under no further liability to any Purchaser except as provided in Sections 6 and
8 hereof.

     12.  In all dealings hereunder, you shall act on behalf of each of the
Purchasers, and the parties hereto shall be entitled to act and rely upon any
statement, request, notice or agreement on behalf of any Purchaser made or given
by you jointly or by Goldman, Sachs & Co. on behalf of you as the
representatives.

     13.  All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Purchasers shall be delivered or sent by mail, telex or
facsimile transmission to you as the representatives in care of Goldman, Sachs &
Co., 32 Old Slip, 21st Floor, New York, New York 10004, Attention: Registration
Department; and if to the Company shall be delivered or sent by mail, telex or
facsimile transmission to the address of the Company set forth in the Offering
Circular, Attention: Secretary; provided, however, that any notice to a
Purchaser pursuant to Section 8(c) hereof shall be delivered or sent by mail,
telex or facsimile transmission to such Purchaser at its address set forth in
its Purchasers' Questionnaire, or telex constituting such Questionnaire, which
address will be supplied to the Company by you upon request.  Any such
statements, requests, notices or agreements shall take effect upon receipt
thereof.

     14.  This Agreement shall be binding upon, and inure solely to the benefit
of, the Purchasers, the Company and, to the extent provided in Sections 8 and 10
hereof, the officers and directors of the Company and each person who controls
the Company or any Purchaser, and their respective heirs, executors,
administrators, successors and assigns, and no other person shall acquire or
have any right under or by virtue of this Agreement. No purchaser of any of the
Securities from any Purchaser shall be deemed a successor or assign by reason
merely of such purchase.

     15.  In respect of any judgment or order given or made for any amount due
hereunder that is expressed and paid in a currency (the "judgment currency")
other than United States dollars, the Company will indemnify each Purchaser
against any loss incurred by such Purchaser as a result of any variation as
between (i) the rate of exchange at which the United States dollar amount is
converted into the judgment currency for the purpose of such judgment or order
and (ii) the rate of exchange at which a Purchaser is able to purchase United
States dollars with the

                                       21
<PAGE>

amount of judgment currency actually received by such Purchaser. The foregoing
indemnity shall constitute a separate and independent obligation of the Company
and shall continue in full force and effect notwithstanding any such judgment or
order as aforesaid. The term "rate of exchange" shall include any premiums and
costs of exchange payable in connection with the purchase of or conversion into
United States dollars.

     16.  Time shall be of the essence of this Agreement.

     17.  This Agreement shall be governed by and construed in accordance
with the laws of the State of New York.

     18.  This Agreement may be executed by any one or more of the parties
hereto in any number of counterparts, each of which shall be deemed to be an
original, but all such respective counterparts shall together constitute one and
the same instrument..

                                       22
<PAGE>

     If the foregoing is in accordance with your understanding, please sign and
return to us ten (10) counterparts hereof, and upon the acceptance hereof by
you, on behalf of each of the Purchasers, this letter and such acceptance hereof
shall constitute a binding agreement between each of the Purchasers and the
Company.  It is understood that your acceptance of this letter on behalf of each
of the Purchasers is pursuant to the authority set forth in a form of Agreement
among Purchasers, the form of which shall be submitted to the Company for
examination upon request, but without warranty on your part as to the authority
of the signers thereof.

                                    Very truly yours,

                                    EXODUS COMMUNICATIONS, INC.

                                    By:   /s/ Ellen M. Hancock
                                        ----------------------------------------

                                    Name:     Ellen M. Hancock
                                          --------------------------------------

                                    Title: President and Chief Executive Officer
                                           -------------------------------------

Accepted as of the date hereof:
Goldman, Sachs & Co.
Donaldson, Lufkin & Jenrette
 Securities Corporation
BancBoston Robertson Stephens Inc.
PaineWebber Incorporated
Morgan Stanley & Co. Incorporated

By:  /s/ Goldman, Sachs & Co.
    -----------------------------------------

Name:
      ---------------------------------------

Title:
       --------------------------------------
             (Goldman, Sachs & Co.)

On behalf of each of the Purchasers

<PAGE>

                                  SCHEDULE I

                                                                   Principal
                                                                   Amount of
                                                                   Securities
                                                                   to be
                        Purchaser                                  Purchased
                        ---------                                  ---------
Goldman, Sachs & Co.                                           $187,500,000.00
Donaldson, Lufkin & Jenrette Securities Corporation            $131,250,000.00
BancBoston Robertson Stephens Inc.                             $ 23,438,000.00
PaineWebber Incorporated                                       $ 23,437,000.00
Morgan Stanley & Co. Incorporated                              $  9,375,000.00
                                                               ----------------
Total                                                          $375,000,000.00
                                                               ===============

                                                                   Principal
                                                                   Amount of
                                                                   Securities
                                                                   to be
                        Purchaser                                  Purchased
                        ---------                                  ---------
Goldman, Sachs & Co.                                           $ 62,500,000.00
Donaldson, Lufkin & Jenrette Securities Corporation            $ 43,750,000.00
BancBoston Robertson Stephens Inc.                             $  7,813,000.00
PaineWebber Incorporated                                       $  7,812,000.00
Morgan Stanley & Co. Incorporated                              $  3,125,000.00
                                                               ----------------
Total                                                          $125,000,000.00
                                                               ===============

<PAGE>

                                                                         ANNEX I

     (1) The Securities have not been and will not be registered under the
Securities Act and may not be offered or sold within the United States or to, or
for the account or benefit of, U.S. persons except in accordance with Regulation
S under the Securities Act or pursuant to an exemption from the registration
requirements of the Securities Act.  Each Purchaser represents that it has
offered and sold the Securities, and will offer and sell the Securities (i) as
part of their distribution at any time and (ii) otherwise until 40 days after
the later of the commencement of the offering and the Time of Delivery, only in
accordance with Rule 903 of Regulation S or Rule 144A under the Securities Act.
Accordingly, each Purchaser agrees that neither it, its affiliates nor any
persons acting on its or their behalf has engaged or will engage in any directed
selling efforts with respect to the Securities, and it and they have complied
and will comply with the offering restrictions requirement of Regulation S.
Each Purchaser agrees that, at or prior to confirmation of sale of Securities
(other than a sale pursuant to Rule 144A), it will have sent to each
distributor, dealer or person receiving a selling concession, fee or other
remuneration that purchases Securities from it during the distribution
compliance period a confirmation or notice to substantially the following
effect:

          "The Securities covered hereby have not been registered under the U.S.
     Securities Act of 1933 (the "Securities Act") and may not be offered and
     sold within the United States or to, or for the account or benefit of, U.S.
     persons (i) as part of their distribution at any time or (ii) otherwise
     until 40 days after the later of the commencement of the offering and the
     closing date, except in either case in accordance with Regulation S (or
     Rule 144A if available) under the Securities Act.  Terms used above have
     the meaning given to them by Regulation S."

Terms used in this paragraph have the meanings given to them by Regulation S.

     Each Purchaser further agrees that it has not entered and will not enter
into any contractual arrangement with respect to the distribution or delivery of
the Securities, except with its affiliates or with the prior written consent of
the Company.

     (2) Notwithstanding the foregoing, Securities may be offered, sold and
delivered by the Purchasers in the United States and to U.S. persons pursuant to
Section 3(a)(i) of this Agreement without delivery of the written statement
required by paragraph (1) above.

     (3) Each Purchaser further represents and agrees that (i) it has not
offered or sold and prior to the date six months after the date of issue of the
Securities will not offer or sell any Securities to persons in the United
Kingdom except to persons whose ordinary activities involve them in acquiring,
holding, managing or disposing of investments (as principal or agent) for the
purposes of their businesses or otherwise in circumstances which have not
resulted and will not result in an offer to the public in the United Kingdom
within the meaning of the Public Offers of Securities Regulations 1995, (b) it
has complied, and will comply, with all applicable provisions
<PAGE>

of the Financial Services Act of 1986 of Great Britain with respect to anything
done by it in relation to the Securities in, from or otherwise involving the
United Kingdom, and (c) it has only issued or passed on and will only issue or
pass on in the United Kingdom any document received by it in connection with the
issuance of the Securities to a person who is of a kind described in Article
11(3) of the Financial Services Act 1986 (Investment Advertisements)
(Exemptions) Order 1996 of Great Britain or is a person to whom the document may
otherwise lawfully be issued or passed on.

     (4) Each Purchaser agrees that it will not offer, sell or deliver any of
the Securities  in any jurisdiction outside the United States except under
circumstances that will result in compliance with the applicable laws thereof,
and that it will take at its own expense whatever action is required to permit
its purchase and resale of the Securities in such jurisdictions.  Each Purchaser
understands that no action has been taken to permit a public offering in any
jurisdiction outside the United States where action would be required for such
purpose.  Each Purchaser agrees not to cause any advertisement of the Securities
to be published in any newspaper or periodical or posted in any public place and
not to issue any circular relating to the Securities, except in any such case
with Goldman, Sachs & Co.'s express written consent and then only at its own
risk and expense.
<PAGE>

                                                                        ANNEX II

     Pursuant to Section 7(d) of the Purchase Agreement, the accountants shall
furnish letters to the Purchasers to the effect that:

         (i)   They are independent certified public accountants with respect to
     the Company and its subsidiaries within the meaning of Section 101 of the
     AICPA Code of Professional Conduct;

         (ii)  In our opinion, the consolidated financial statements and
     financial statement schedules audited by us and included in the Offering
     Circular comply as to form in all material respects with the applicable
     requirements of the Exchange Act and the related published rules and
     regulations;

         (iii) The unaudited selected financial information with respect to the
     consolidated results of operations and financial position of the Company
     for the four most recent fiscal years included in the Offering Circular
     agrees with the corresponding amounts (after restatements where applicable)
     in the audited consolidated financial statements for such four fiscal
     years;

         (iv)  On the basis of limited procedures not constituting an audit in
     accordance with generally accepted auditing standards, consisting of a
     reading of the unaudited financial statements and other information
     referred to below, a reading of the latest available interim financial
     statements of the Company and its subsidiaries, inspection of the minute
     books of the Company and its subsidiaries since the date of the latest
     audited financial statements included in the Offering Circular, inquiries
     of officials of the Company and its subsidiaries responsible for financial
     and accounting matters and such other inquiries and procedures as may be
     specified in such letter, nothing came to their attention that caused them
     to believe that:

               (A) the unaudited consolidated statements of income, consolidated
         balance sheets and consolidated statements of cash flows included in
         the Offering Circular are not in conformity with generally accepted
         accounting principles applied on the basis substantially consistent
         with the basis for the audited condensed consolidated statements of
         income, consolidated balance sheets and consolidated statements of cash
         flows included in the Offering Circular;

               (B) any other unaudited income statement data and balance sheet
         items included in the Offering Circular do not agree with the
         corresponding items in the unaudited consolidated financial statements
         from which such data and items were derived, and any such unaudited
         data and items were not determined on a basis substantially consistent
         with the basis for the corresponding amounts in the audited
         consolidated financial statements included in the Offering Circular;

<PAGE>

            (C) the unaudited financial statements which were not included in
          the Offering Circular but from which were derived any unaudited
          condensed financial statements referred to in Clause (A) and any
          unaudited income statement data and balance sheet items included in
          the Offering Circular and referred to in Clause (B) were not
          determined on a basis substantially consistent with the basis for the
          audited consolidated financial statements included in the Offering
          Circular;

            (D) any unaudited pro forma consolidated condensed financial
          statements included in the Offering Circular do not comply as to form
          in all material respects with the applicable accounting requirements
          or the pro forma adjustments have not been properly applied to the
          historical amounts in the compilation of those statements;

            (E) as of a specified date not more than five days prior to the date
          of such letter, there have been any changes in the consolidated
          capital stock (other than issuances of capital stock upon exercise of
          options and stock appreciation rights, upon earn-outs of performance
          shares and upon conversions of convertible securities, in each case
          which were outstanding on the date of the latest financial statements
          included in the Offering Circular or any increase in the consolidated
          long-term debt of the Company and its subsidiaries, or any decreases
          in consolidated net current assets or stockholders' equity or other
          items specified by the Purchasers, or any increases in any items
          specified by the Purchasers, in each case as compared with amounts
          shown in the latest balance sheet included in the Offering Circular
          except in each case for changes, increases or decreases which the
          Offering Circular discloses have occurred or may occur or which are
          described in such letter; and

            (F) for the period from the date of the latest financial statements
          included in the Offering Circular to the specified date referred to in
          Clause (E) there were any decreases in consolidated net revenues or
          operating profit or the total or per share amounts of consolidated net
          income or other items specified by the Purchasers, or any increases in
          any items specified by the Purchasers, in each case as compared with
          the comparable period of the preceding year and with any other period
          of corresponding length specified by the Purchasers, except in each
          case for decreases or increases which the Offering Circular discloses
          have occurred or may occur or which are described in such letter; and

         (v) In addition to the examination referred to in their report(s)
     included in the Offering Circular and the limited procedures, inspection of
     minute books, inquiries and other procedures referred to in paragraphs
     (iii) and (iv) above, they have carried out certain specified procedures,
     not constituting an audit in accordance with generally accepted auditing
     standards, with respect to certain amounts, percentages and financial
     information specified by the Purchasers, which are derived from the general
     accounting records of the Company and its subsidiaries, which appear in the
     Offering Circular, and
<PAGE>

     have compared certain of such amounts, percentages and financial
     information with the accounting records of the Company and its subsidiaries
     and have found them to be in agreement.
<PAGE>

                                                               December __, 1999

Dear KPMG LLP:

     Goldman, Sachs & Co., as representative of the Purchasers of 10 3/4% Senior
Notes due 2009 to be issued by Exodus Communications, Inc. (the "Company"), will
be reviewing certain information relating to the Company that will be included
(incorporated by reference) in the Offering Circular.  This review process,
applied to the information relation to the issue, is (will be) substantially
consistent with the due diligence review process that we would perform if this
placement of securities were being registered pursuant to the Securities Act of
1933 (the Act).  It is recognized however that what is "substantially
consistent" may vary from situation to situation and may not be the same as that
done in a registered offering of the same securities for the same issuer and
whether the procedures being, or to be, followed will be "substantially
consistent" will be determined by us on a case-by-case basis.  We are
knowledgeable with respect to the due diligence review process that would be
performed if this placement of securities were being registered pursuant to the
Act.  We hereby request that you deliver to us a "comfort" letter concerning the
financial statements of the issuer and certain statistical and other data
included in the offering document.  We will contact you to identify the
procedures we wish you to follow and the form we wish the comfort letter to
take.

                                    Very truly yours,

                                    .........................................
                                               (Goldman, Sachs & Co.)

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