Document:

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                             JATO COMMUNICATIONS CORP.

                SECOND AMENDED AND RESTATED STOCKHOLDERS' AGREEMENT

<PAGE>

                             JATO COMMUNICATIONS CORP.

                SECOND AMENDED AND RESTATED STOCKHOLDERS' AGREEMENT

     THIS SECOND AMENDED AND RESTATED STOCKHOLDERS' AGREEMENT (the
"AGREEMENT") is made as of this 20th day of January, 2000, by and among JATO
COMMUNICATIONS CORP., a Delaware corporation (the "COMPANY"), the holders of
the Company's Common Stock listed on EXHIBIT A hereto (the "COMMON HOLDERS"),
the holders of the Company's Series B Preferred Stock listed on EXHIBIT B
hereto (the "SERIES B HOLDERS"), the holders of the Company's Series C
Preferred Stock listed on EXHIBIT C hereto (the "SERIES C HOLDERS") and the
holders of the Company's Series D Preferred Stock listed on EXHIBIT D hereto
(the "SERIES D HOLDERS").

                                      RECITALS

     WHEREAS, in connection with the sale of the Company's Series C Preferred
Stock to the Series C Holders, the Company, the Common Holders, the Series B
Holders and the Series C Holders entered into an Amended and Restated
Stockholders' Agreement, dated as of September 16, 1999, as amended by the
First Amendment to Amended and Restated Stockholders' Agreement, dated as of
December 22, 1999 (the "PRIOR AGREEMENT") to provide for the future voting of
their shares of the Company's capital stock;

     WHEREAS, the Series D Holders are purchasing shares of the Company's
Series  D Preferred Stock (the "SERIES D STOCK") pursuant to those certain
Series D Preferred Stock Purchase Agreements (the "PURCHASE AGREEMENTS");

     WHEREAS, such Series D Holders were induced by the Company to purchase
the Series D Stock in part by the agreement of the Company, the Stockholders,
the Series B Holders and the Series C Holders to enter into this Agreement;
and

     WHEREAS, it is a condition precedent to the obligations of the Series D
Holders to purchase the Series D Stock pursuant to the Purchase Agreements
that the parties hereto enter into this Agreement.

     NOW, THEREFORE, in consideration of the mutual covenants set forth
herein, the parties agree hereto as follows:

1.   GENERAL

     (a)  AMENDMENT AND RESTATEMENT OF THE PRIOR AGREEMENT.  The undersigned
parties who constitute the parties necessary to amend the Prior Agreement
hereby agree that, effective upon the date hereof, the Prior Agreement is
null and void and superseded by the rights and obligations set forth in this
Agreement.

                                       1
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2.   DEFINITIONS.

     (a)  "COMMON SHARES" shall mean all shares of capital stock of the
Company registered in the names of the Common Holders or beneficially owned
by them as of the date hereof and any and all other securities of the Company
legally acquired by the Common Holders after the date hereof.

     (b)  "INITIAL OFFERING" shall mean the Company's first firm commitment
underwritten public offering of its Common Stock registered under the
Securities Act of 1933.

     (c)  "INVESTORS" shall include the Common Holders, the Series B Holders,
the Series C Holders and the Series D Holders.

     (d)  "QUALIFIED PUBLIC OFFERING" shall mean a firm commitment
underwritten public offering pursuant to an effective registration statement
under the Securities Act of 1933 covering the offer and sale of Common Stock
for the account of the Company in which (i) the per share price is at least
equal to the "Target Percentage" (as hereinafter defined) multiplied by the
then-effective Series B Conversion Price (the "SERIES B CONVERSION PRICE"),
determined in accordance with the Company's Restated Certificate of
Incorporation, as filed with the Secretary of State of the State of Delaware
(the "THRESHOLD PRICE"), (ii) the gross cash proceeds to the Company (before
underwriting discounts, commissions and fees) are at least $30,000,000 and
(iii) the shares of Common Stock are listed on any national securities
exchange or have been registered under Section 12(g) of the Securities
Exchange Act of 1934.  As used herein, "TARGET PERCENTAGE" shall mean (A) an
amount equal to the product of 2.5 and $1.50 (as adjusted for stock
dividends, combinations, splits, recapitalizations and the like) prior to the
third anniversary of the date hereof and (B) an amount equal to the product
of 3.5 and $1.50 (as adjusted for stock dividends, combinations, splits,
recapitalizations and the like) on or after the third anniversary of the date
hereof.

     (e)  "SERIES B SHARES" shall mean all shares of capital stock of the
Company registered in the names of the Series B Holders or beneficially owned
by them as of the date hereof and any and all other securities of the Company
legally acquired by the Series B Holders after the date hereof (including but
not limited to all shares of Common Stock issued upon conversion of, or as
dividends or other rights with respect to, the Series B Stock).

     (f)  "SERIES C SHARES" shall mean all shares of capital stock of the
Company registered in the names of the Series C Holders or beneficially owned
by them as of the date hereof and any and all other securities of the Company
legally acquired by the Series C Holders after the date hereof (including but
not limited to all shares of Common Stock issued upon conversion of, or as
dividends or other rights with respect to, the Series C Stock).

     (g)  "SERIES D SHARES" shall mean all shares of capital stock of the
Company registered in the names of the Series D Holders or beneficially owned
by them as of the date hereof and any and all other securities of the Company
legally acquired by the Series D Holders after the date hereof (including but
not limited to all shares of Common Stock issued upon conversion of, or as
dividends or other rights with respect to, the Series C Stock).

                                       2
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     (g)  "SHARES" shall mean the Company's (i) Common Shares, (ii) the
Series B Shares, (iii) the Series C Shares, and (iv) the Series D Shares.

3.   APPROVED SALE.

     (a)  VOTING OF SHARES.  The Common Holders, the Series B Holders, the
Series C Holders and the Series D Holders each agree to vote their respective
Common Shares, Series B Shares, Series C Shares and Series D Shares in
accordance with the provisions of this Section 3.

     (b)  DRAG-ALONG PROVISION.  At any time following the first anniversary
of the date of this Agreement, (i) the holders of more than seventy-five
percent (75%) of the Series B Shares then outstanding and (ii) the holders of
a majority of the outstanding capital stock of the Company then outstanding
(the "REQUISITE HOLDERS") shall have the option to compel a sale of the
Company or of all or substantially all of the Company's assets at any time (a
"DRAG-ALONG SALE"); PROVIDED, THAT, in the event that the holders of Series B
Shares constitute at least a majority of the outstanding capital stock of the
Company (on an as-converted basis) the provisions of Section 3(b)(ii) shall
not apply. The Drag-Along Right established by this Section 3(b) shall not
apply to, and shall terminate upon, the Company's consummation of an Initial
Offering.

     (c)  FORCED SALE.  The Company hereby covenants and agrees that, if the
Company has not effected a Qualified Public Offering or obtained the Minimum
Trading Requirement (as defined below) prior to the fourth anniversary of the
date of this Agreement, the Company shall use commercially reasonable
efforts, including retaining an appropriate investment bank reasonably
satisfactory to a majority in interest of the Series B Holders, to identify a
suitable purchaser of the Company to be effected by means of a merger,
consolidation or sale of stock or assets, auction or otherwise at such time
(a "FORCED SALE," and, together with a Drag-Along Sale, an "APPROVED SALE").
As used herein, the "MINIMUM TRADING REQUIREMENT" shall be obtained following
an Initial Offering on the business day following the end of a one hundred
eighty (180) consecutive day period during which the average closing price of
the Company's Common Stock on each such day exceeded the Threshold Price.

     (d)  NO OBJECTIONS.  Each Investor agrees that in the event of an
Approved Sale, it shall consent to and raise no objections against the
Approved Sale, and if the Approved Sale is structured as (i) a merger or
consolidation of the Company, or a sale of all or substantially all of the
Company's assets, each such Investor shall waive any dissenters' rights,
appraisal rights or similar rights in connection with such merger,
consolidation or asset sale or (ii) a sale of the stock of the Company, then
each such Investor shall agree to sell its respective Shares on the terms and
conditions approved by the Requisite Holders, PROVIDED, THAT, such terms do
not provide that the Series B Holders, Series C Holders or Series D Holders
would receive less than the amount that would be distributed to such Series B
Holders, Series C Holders or Series D Holders in the event of a liquidation
of the Company in accordance with the Company's Restated Certification of
Incorporation.  The Investors shall each take all necessary and desirable
actions approved by the Requisite Holders, in connection with the
consummation of the Approved Sale, including the execution of such agreements
and such instruments and other actions reasonably necessary to (i) provide
the representations, warranties, indemnities, covenants, conditions,
non-compete agreements, escrow agreements and other provisions and agreements
relating to

                                       3
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such Approved Sale and (ii) effectuate the allocation and distribution of the
aggregate consideration upon the Approved Sale.

4.   RESTRICTIONS ON TRANSFER; LEGEND.

     (a)  RESTRICTIONS ON TRANSFER.

          (i)  Each Investor agrees not to make any disposition of all or any
portion of the Shares unless and until the transferee has agreed in writing
for the benefit of the Company to be bound by this Section 4(a) unless and
until:

               (A)  There is then in effect a registration statement under
the Securities Act of 1933 covering such proposed disposition and such
disposition is made in accordance with such registration statement; or

               (B)  (1) Such Investor shall have notified the Company of the
proposed disposition and shall have furnished the Company with a detailed
statement of the circumstances surrounding the proposed disposition and (2)
if reasonably requested by the Company, such Investor shall have furnished
the Company with an opinion of counsel, reasonably satisfactory to the
Company, that such disposition will not require registration of such shares
under the Securities Act of 1933 or any applicable state securities or Blue
Sky laws.  It is agreed that the Company will not require opinions of counsel
for transactions made pursuant to Rule 144 except in unusual circumstances.

               (C)  Notwithstanding the provisions of paragraphs (A) and (B)
above, no such registration statement or opinion of counsel shall be
necessary for a transfer by an Investor which is (1) a partnership to any or
all of its partners or former partners, (2) a corporation to its stockholders
in accordance with their interest in the corporation, (3) a limited liability
company to its members or former members in accordance with their membership
interest, (4) by a trust to its beneficiaries in accordance with their
interests in the trust, (5) to the Investor's family member or trust for the
benefit of an individual Investor or (6) to an affiliate of the Investor;
PROVIDED, THAT, the transferee will be subject to the terms of this Agreement
to the same extent as if he were an original Investor hereunder; and
PROVIDED, FURTHER, HOWEVER, that such transfer is pursuant to an exemption
under the Securities Act of 1933.

PROVIDED, HOWEVER, that in connection with any such transfer or disposition
other than as described in paragraph (A) above, the transferee shall have
agreed in writing to be bound by the provisions of the Agreement.

     (b)  Each certificate representing Shares now or hereafter owned by an
Investor or issued to any person shall be endorsed with the following legend:

     FIRST LEGEND:

     THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
     SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), AND MAY NOT BE OFFERED,
     SOLD OR OTHERWISE TRANSFERRED, ASSIGNED, PLEDGED, HYPOTHECATED OR OTHERWISE
     DISPOSED OF UNLESS AND

                                       4
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     UNTIL REGISTERED UNDER THE ACT OR UNLESS THE COMPANY HAS RECEIVED AN
     OPINION OF COUNSEL SATISFACTORY TO THE COMPANY AND ITS COUNSEL THAT SUCH
     REGISTRATION IS NOT REQUIRED.

     SECOND LEGEND:

     "THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO THE TERMS
     AND CONDITIONS OF A CERTAIN SECOND AMENDED AND RESTATED STOCKHOLDERS'
     AGREEMENT WHICH PLACES CERTAIN RESTRICTIONS ON THE SHARES REPRESENTED
     HEREBY.  ANY PERSON ACCEPTING ANY INTEREST IN SUCH SHARES SHALL BE
     DEEMED TO AGREE TO AND SHALL BECOME BOUND BY ALL THE PROVISIONS OF
     SUCH AGREEMENT.  COPIES OF SUCH AGREEMENT MAY BE OBTAINED WITHOUT
     CHARGE UPON WRITTEN REQUEST TO THE SECRETARY OF THE COMPANY AT ITS
     PRINCIPAL PLACE OF BUSINESS."

     (c)  The Investors agree that the Company may instruct its transfer
agent to impose transfer restrictions on the shares represented by
certificates bearing the legend referred to in Section 4(b) above to enforce
the provisions of this Agreement and the Company agrees to promptly do so.
The Company agrees that, during the term of this Agreement, it will not
remove, and it will not permit to be removed, the legend from any certificate
and will place or cause to be placed the legend on any new certificate issued
to represent Common Shares. The legend shall be removed upon termination of
this Agreement.

5.   MISCELLANEOUS.

     (a)  GOVERNING LAW.  This Agreement shall be and construed and enforced
in accordance with the laws of the State of Colorado without regard to its
conflict-of-laws rules.

     (b)  ASSIGNS.  Except as otherwise expressly provided herein, the
provisions hereof shall inure to the benefit of, and be binding upon, the
successors, assigns, heirs, executors, and administrators of the parties
hereto and shall inure to the benefit of and be enforceable by each person
who shall be a holder of Shares from time to time.

     (c)  SEVERABILITY.  In case any provision of the Agreement 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.

     (d)  SUBSEQUENT COMMON HOLDERS.  No person or persons ("SUBSEQUENT
COMMON HOLDER") shall acquire, either by purchase or otherwise any shares of
common stock of the Company subsequent to the date hereof, unless such
Subsequent Common Holder shall become a party to this Agreement and agree to
be bound by the provisions hereof.  Such Subsequent Common Holders shall be
considered "Common Holders" for all purposes hereof and all shares of common
stock of the Company held by such Subsequent Investors shall be deemed to be
"Common Shares" for all purposes hereof.  Notwithstanding anything contrary
contained herein, if the Company shall issue any Common Shares as set forth
in the previous sentence, such

                                       5
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Subsequent Common Holder may become a party to this Agreement by executing
and delivering an "Additional Party Signature Page" in the form set forth as
EXHIBIT E.

     (e)  ADDITION OF OTHER PARTIES.  After the date of this Agreement, the
Company may, without the prior consent of the Investors, make additional
persons a party to this Agreement by executing an "Additional Party Signature
Page" in the form set forth as EXHIBIT E; provided that the inclusion of such
additional party is approved by the Company's board of directors.
Thereafter, the shares of capital stock held by such person or shares
issuable upon conversion of such securities shall be deemed Shares and such
investor shall be an "Investor" for purposes hereof and both of such
definitions shall be deemed duly and properly amended.

     (f)  AMENDMENT.

          (i)  Except as otherwise expressly provided, this Agreement may be
amended or modified only upon the written consent of the Company and (A) the
holders of a majority of the Series B Shares, Series C Shares and Series D
Shares or share equivalents then outstanding and (B) the holders of a
majority of the Common Shares then outstanding; PROVIDED, HOWEVER, that the
provisions of Sections 3(b) and (c) shall not be amended without the consent
of the holders of a majority of the Series B Shares.

          (ii) Except as otherwise expressly provided, the obligations of the
Company and the rights of the Holders under this Agreement may be waived only
with the written consent of (A) the holders of a majority of the Series B
Shares, Series C Shares and Series D Shares or share equivalents then
outstanding and (B) the holders of a majority of the Common Shares then
outstanding.

     (g)  NOTICES.  All notices required or permitted hereunder shall be
deemed effectively given:  (i) upon personal delivery to the party to be
notified, (ii) when sent by confirmed telex or facsimile if sent during
normal business hours of the recipient; if not, then on the next business
day, (iii) upon receipt after having been sent by registered or certified
mail, return receipt requested, postage prepaid, or (iv) one (1) day after
deposit with a nationally recognized overnight courier, specifying next day
delivery, with written verification of receipt.  All communications shall be
sent to the party to be notified at the address set forth on the signature
pages hereto or the exhibits hereto or at such other address as such party
may designate by ten (10) days' advance written notice to the other parties
hereto.

     (h)  ATTORNEYS' FEES.  If legal action is brought to enforce or
interpret this Agreement, the prevailing party shall be entitled to recover
from the losing party all fees, costs and expenses of enforcing any rights of
such prevailing party under or with respect to this Agreement, including
without limitation, such reasonable fees and expenses of attorneys and
accountants, which shall include, without limitation, all fees, costs and
expenses of appeals.

     (i)  COMPLETE AGREEMENT. This Agreement constitutes the entire agreement
and supersedes all other prior and contemporaneous agreements and
undertakings, both written and oral, between the parties hereto with regard
to the subject matter hereof.

                                       6
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     (j)  COUNTERPARTS.  This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

     (k)  TITLES AND SUBTITLES. The titles of the paragraphs and
subparagraphs of this Agreement are for convenience of reference only and are
not to be considered in construing this Agreement.

     (l)  INJUNCTIVE RELIEF. It is acknowledged that it will be impossible to
measure in money the damages that would be suffered if the parties fail to
comply with certain of the obligations imposed on them by this Agreement and
that, in the event of any such failure, an aggrieved person will be
irreparably damaged and will not have an adequate remedy at law.  Any such
person shall, therefore, be entitled to injunctive relief and/or specific
performance to enforce such obligations, and if any action should be brought
in equity to enforce any of such provisions of this Agreement, none of the
parties hereto shall raise the defense that there is an adequate remedy at
law.

                                       7
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     IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED
STOCKHOLDERS' AGREEMENT is hereby executed as of the date first above written.

COMPANY:                           HOLDERS:

JATO COMMUNICATIONS CORP.               MICROSOFT CORPORATION
1099 18th Street
Denver, Colorado 80202                  By:  /s/  John G. Connors
                                           -----------------------------------

By:  /s/ Gerald K. Dinsmore             Title:    SVP-CFO
   -------------------------------            --------------------------------

Name:     Gerald K. Dinsmore
     -----------------------------

Title:    President
      ----------------------------

              SECOND AMENDED AND RESTATED STOCKHOLDERS' AGREEMENT

<PAGE>

     IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED STOCKHOLDERS'
AGREEMENT is hereby executed as of the date first above written.

COMPANY:                                HOLDERS:

JATO COMMUNICATIONS CORP.               MAYFIELD ASSOCIATES FUND IV

1099 18th Street
Denver, Colorado 80202                  By:  /s/  Todd A. Brooks
                                           ------------------------------------

By:  /s/ Gerald K. Dinsmore             Title:    General Partner
   -------------------------------            --------------------------------

Name:     Gerald K. Dinsmore
     -----------------------------

Title:    President
      ----------------------------

<PAGE>

IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED STOCKHOLDERS'
AGREEMENT is hereby executed as of the date first above written.

COMPANY:                                HOLDERS:

JATO COMMUNICATIONS CORP.               MAYFIELD PRINCIPALS FUND LLC

1099 18th Street
Denver, Colorado 80202                  By:  /s/  Todd A. Brooks
                                           -----------------------------------

By:  /s/ Gerald K. Dinsmore             Title:    General Partner
   -------------------------------            --------------------------------

Name:     Gerald K. Dinsmore
     -----------------------------

Title:    President
      ----------------------------

<PAGE>

IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED STOCKHOLDERS'
AGREEMENT is hereby executed as of the date first above written.

COMPANY:                                HOLDERS:

JATO COMMUNICATIONS CORP.               MAYFIELD X

1099 18th Street
Denver, Colorado 80202                  By:  /s/  Russell C. Hirsch
                                           -----------------------------------

By:  /s/ Gerald K. Dinsmore             Title:    General Partner
   -------------------------------            --------------------------------

Name:     Gerald K. Dinsmore
     -----------------------------

Title:    President
      ----------------------------

<PAGE>

IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED STOCKHOLDERS'
AGREEMENT is hereby executed as of the date first above written.

COMPANY:                                HOLDERS:

JATO COMMUNICATIONS CORP.               ABN AMRO, INC.
1099 18th Street                        I EAGLE TRUST
Denver, Colorado 80202                  ABN AMRO CAPITAL (USA), INC.

By:  /s/ Gerald K. Dinsmore             By: /s/ Daniel J. Foreman
   -------------------------------         -----------------------------------

Name:     Gerald K. Dinsmore            Title:    Managing Director
     -----------------------------            --------------------------------

Title:    President
      ----------------------------

<PAGE>

IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED STOCKHOLDERS'
AGREEMENT is hereby executed as of the date first above written.

COMPANY:                                HOLDERS:

JATO COMMUNICATIONS CORP.               CREST COMMUNICATIONS PARTNERS LP

1099 18th Street
Denver, Colorado 80202                  By:  /s/  Gregg A. Mockenhaupt
                                           -----------------------------------

By:  /s/ Gerald K. Dinsmore             Title:    Managing Director
   -------------------------------            --------------------------------

Name:     Gerald K. Dinsmore
     -----------------------------

Title:    President
      ----------------------------

<PAGE>

IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED STOCKHOLDERS'
AGREEMENT is hereby executed as of the date first above written.

COMPANY:                                HOLDERS:

JATO COMMUNICATIONS CORP.               CEA CAPITAL PARTNERS USA LP

1099 18th Street
Denver, Colorado 80202                  By:  /s/  James J. Collis
                                           -----------------------------------

By:  /s/ Gerald K. Dinsmore             Title:    Executive Vice President
   -------------------------------            --------------------------------

Name:     Gerald K. Dinsmore
     -----------------------------

Title:    President
      ----------------------------

<PAGE>

IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED STOCKHOLDERS'
AGREEMENT is hereby executed as of the date first above written.

COMPANY:                                HOLDERS:

JATO COMMUNICATIONS CORP.               CEA CAPITAL PARTNERS USA CI, L.P.
1099 18th Street
Denver, Colorado 80202                  By:  /s/  James J. Collis
                                           -----------------------------------

By:  /s/ Gerald K. Dinsmore             Title:    Executive Vice President
   -------------------------------            --------------------------------

Name:     Gerald K. Dinsmore
     -----------------------------

Title:    President
      ----------------------------

<PAGE>

IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED STOCKHOLDERS'
AGREEMENT is hereby executed as of the date first above written.

COMPANY:                                HOLDERS:

JATO COMMUNICATIONS CORP.

1099 18th Street
Denver, Colorado 80202                       /s/  Bruce E. Dines, Jr.
                                        --------------------------------------

By:  /s/ Gerald K. Dinsmore             Title:
   -------------------------------            --------------------------------

Name:     Gerald K. Dinsmore
     -----------------------------

Title:    President
      ----------------------------

<PAGE>

IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED STOCKHOLDERS'
AGREEMENT is hereby executed as of the date first above written.

COMPANY:                                HOLDERS:

JATO COMMUNICATIONS CORP.

1099 18th Street
Denver, Colorado 80202                       /s/  Leonard Allsup
                                        --------------------------------------

By:  /s/ Gerald K. Dinsmore             Title:
   -------------------------------            --------------------------------

Name:     Gerald K. Dinsmore
     -----------------------------

Title:    President
      ----------------------------

<PAGE>

IN WITNESS WHEREOF, the foregoing SECOND AMENDED AND RESTATED STOCKHOLDERS'
AGREEMENT is hereby executed as of the date first above written.

COMPANY:                                HOLDERS:

JATO COMMUNICATIONS CORP.
1099 18th Street
Denver, Colorado 80202                       /s/  Brian E. Gast
                                        --------------------------------

By:  /s/ Gerald K. Dinsmore             Title:
   -------------------------------            --------------------------------

Name:     Gerald K. Dinsmore
     -----------------------------

Title:    President
      ----------------------------

<PAGE>

                                     EXHIBIT A

                                   COMMON HOLDERS

NAME AND ADDRESS:

Eliot Boyle
1099 18th Street, Suite 700
Denver, CO  80202

Patrick M. Green
1099 18th Street, Suite 700
Denver, CO  80202

Rex H. Humston
1099 18th Street, Suite 700
Denver, CO  80202

                                      A-1
<PAGE>

                                     EXHIBIT B

                                  SERIES B HOLDERS

NAME AND ADDRESS:

Crest Communications Partners
L.P.
320 Park Avenue
17th Floor
New York, NY 10022
  Attn: Gregg Mockenhaupt

CEA Capital Partners USA, L.P.
17 State Street
35th Floor
New York, NY  10004
  Attn: Steve McCall

CEA Capital Partners USA
CI, L.P.
17 State Street
35th Floor
New York, NY  10004
  Attn: Steve McCall

ABN AMRO Capital (USA), Inc.
208 S. LaSalle Street
10th Floor
Chicago, IL  60604
  Attn: Daniel Forman

I Eagle Trust
208 S. LaSalle Street
10th Floor
Chicago, IL  60604
  Attn: Daniel Forman

ABN AMRO Incorporated
208 S. LaSalle Street
10th Floor
Chicago, IL  60604
  Attn: Daniel Forman

                                      B-2
<PAGE>

Access Technology Partners, L.P.
Hambrecht & Quist
One Bush Street
San Francisco, CA  94104
  Attn: Alex Sloan

Access Technology Partners
Brokers Fund, L.P.
Hambrecht & Quist
One Bush Street
San Francisco, CA  94104
  Attn: Alex Sloan

Hambrecht & Quist California
One Bush Street
San Francisco, CA  94104
  Attn: Alex Sloan

Hambrecht & Quist Employee
Venture Fund, L.P. II
One Bush Street
San Francisco, CA  94104
  Attn: Alex Sloan

H&Q JATO Communications
Investors, L.P.
Hambrecht & Quist
One Bush Street
San Francisco, CA  94104

John P. Raeder, Jr. and Deborah
M. Raeder, as Joint Tenants
5625 S. Bellaire Ct.
Greenwood Village, CO 80121

Gilbert Family Trust
1211 Whispering Oaks
Danville, CA  94506
  Attn: Dean Gilbert

Jeffrey D. Morgan
2883 Lee Hill Road
Boulder,  CO 80302

Karin W. Morgan
2883 Lee Hill Road
Boulder, CO  80302

                                       B-3
<PAGE>

Marty S. Clayman
2401 Shady Oak Place
Lexington, KY 40515

Robert J. Grubb
7259 Longview Drive
Niwot, CO  80503

Richard K. Coleman, Jr.
22 Viking Drive
Englewood, CO  80110

GC&H Investments
C/o Cooley Godward LLP
One Maritime Plaza
20th Floor
San Francisco, CA  94111
  Attn: John Cardoza

Michael S. Grunwald
C/o Lehman Brothers
555 California Street
30th Floor
San Francisco, CA  94104

Mark T. Stolte
22595 Treetop Lane
Golden, CO  80401

Seybold Brothers Investments
4075 Hermitage Road
Colorado Springs, CO 80906
  Attn: William Seybold

Leonard Allsup
1720 Wyncoop
Unit 203
Denver, CO  80202-1077

William J.B. Brady III
Credit Suisse First Boston
2400 Hanover Street
Palo Alto, CA  94304

                                      B-4
<PAGE>

Stephen S. Hyde and Lorreen L.
George, joint tenants w/right of
survivorship
31 Broadmoor Avenue
Colorado Springs, CO  80906

Frank P. Quattrone and
Denise Foderavo, Trustees
Quattrone Family Trust UTA DTD
9/14/91
Credit Suisse First Boston
2400 Hanover Street
Palo Alto, CA  94304

Ian C. and Susan D. Griffis
3519 E. Palmer Divide Road
Larkspur, CO  80118

Charles Calloway
1616 17th Street, Suite 600
Denver, CO  80202

Mark Mangiola
425 Broadway Street
Redwood City, CA 94063

Benefactor Funding Corp.
234 Columbine Street
Suite 240
Denver, CO  80206
Attn:  Randy Carter

Richard & Julie K. Wham JTWROS
15 Polo Club Drive
Denver, CO  80209

Gerald H. Parrick III
25 Sandlewood Drive
Novato, CA 94945

Bruce E. Dines, Jr.
825 York Street
Denver, CO  80206

                                      B-5
<PAGE>

Jill S. Dines
825 York Street
Denver, CO  80206

Katherine Dines
2000 Little Raven #1-C
Denver, CO  80202

Curtis J. Ahart
6090 Spruce Hill Court
Shorewood, MN  55331

Keith Bennett
16728 E. Prentice Circle
Aurora, CO  80015

                                      B-6
<PAGE>

                                  EXHIBIT C

                               SERIES C HOLDERS

NAME AND ADDRESS

Mayfield X, L.P.
2800 Sand Hill Road
Suite 250
Menlo Park, CA 94025
Attn:  Todd Brooks

Mayfield Associates Fund IV, L.P.
2800 Sand Hill Road
Suite 250
Menlo Park, CA 94025
Attn:  Todd Brooks

Mayfield Principals Fund, L.L.C.
2800 Sand Hill Road
Suite 250
Menlo Park, CA 94025
Attn:  Todd Brooks

Crest Communications Partners L.P.
320 Park Avenue
17th Floor
New York, NY 10022
  Attn: Gregg Mockenhaupt

CEA Capital Partners USA, L.P.
17 State Street
35th Floor
New York, NY 10004
  Attn: Steve McCall

CEA Capital Partners USA CI, L.P.
17 State Street
35th Floor
New York, NY 10004
  Attn: Steve McCall

ABN AMRO Capital (USA), Inc.

                                      C-1
<PAGE>

NAME AND ADDRESS
208 S. LaSalle Street
10th Floor
Chicago, IL 60604
  Attn: Daniel Foreman

I Eagle Trust
208 S. LaSalle Street
10th Floor
Chicago, IL 60604
  Attn: Daniel Foreman

ABN AMRO Incorporated
208 S. LaSalle Street
10th Floor
Chicago, IL 60604
  Attn: Daniel Foreman

Access Technology Partners, L.P.
Hambrecht & Quist
One Bush Street
San Francisco, CA 94104
  Attn: Alex Sloan

NAME AND ADDRESS
Access Technology Partners Brokers
Fund, L.P.
Hambrecht & Quist
One Bush Street
San Francisco, CA 94104
  Attn: Alex Sloan

Hambrecht & Quist California
Hambrecht & Quist
One Bush Street
San Francisco, CA 94104
  Attn: Alex Sloan

Hambrecht & Quist Employee Venture
Fund, L.P. II
Hambrecht & Quist
One Bush Street
San Francisco, CA 94104
  Attn: Alex Sloan

                                      B-2
<PAGE>

NAME AND ADDRESS
H&Q JATO Communications Investors,
L.P.
Hambrecht & Quist
One Bush Street
San Francisco, CA 94104
  Attn: Alex Sloan

TCI Satellite Entertainment, Inc.
8085 S. Chester Street
Suite 110
Englewood, CO 80112
Attn:  Ken

Keith Bennett
16728 E. Prentice Circle
Aurora, CO  80015

Jeffrey D. Morgan
2883 Lee Hill Road
Boulder,  CO 80302

Karin W. Morgan
2883 Lee Hill Road
Boulder,  CO 80302

John P. Raeder, Jr. and Deborah M.
Raeder, as Joint Tenants
5625 S. Bellaire Ct.
Greenwood Village, CO 80121

Michael S. Grunwald
340 Lombard Street
Apt. A
San Francisco, CA  94133

                                      B-3
<PAGE>

NAME AND ADDRESS
Gerald K. Dinsmore
c/o Jato Communications Corp.
1099 18th Street
Denver, CO 80202

Jerome C. Ramsey
506 Providence Drive
Castle Rock, CO 80104

Robert G. Vidal and Tina M. Vidal,
as Joint Tenants
5 Snowy Owl Lane
Littleton, CO 80127

Gerard A. Maglio
5640 S. Bellaire Court
Greenwood Village, CO 80121

Rex Humston
6889 S. Salida Street
Foxfield, CO 80016

Ed Ziehm
864 Meadow Rose Lane
Castle Rock, CO 80104

                                      B-4
<PAGE>

NAME AND ADDRESS
Trustee F.B.O. FWD Corporation
Savings & Profit Sharing Trust,
James M. Green, Segregated Account
c/o - James P. Cooney, President
Pension Inc., Trustee
136 N. Maple Avenue

Patrick M. Green
12098 W. 75th Place
Arvada, CO 80005

William D. Myers and Dana D.
Myers, as Joint Tenants
3822 South Sebring Court
Denver, CO 80237

Marty S. Clayman
2401 Shady Oak Place
Lexington, KY 40515

Bato, LLC
8136 S. Grant Way
Littleton, CO  80122

                                      B-5
<PAGE>

                                     EXHIBIT D

                                  SERIES D HOLDERS

NAME AND ADDRESS

U.S. Telesource, Inc.
555 Seventeenth Street
Denver, CO 80202
Attn:_____________
Facsimile: 303-992-1724

Microsoft Corporation
One Microsoft Way
Redmond, WA  98052
Attn:  Michael Leitner
Facsimile:

                                      B-6
<PAGE>

                                     EXHIBIT E

                             JATO COMMUNICATIONS CORP.
    SECOND AMENDED AND RESTATED STOCKHOLDERS' AGREEMENT, DATED JANUARY __, 2000

                          ADDITIONAL PARTY SIGNATURE PAGE

Pursuant to Section 5 [(d)] or [(e)] of that certain Second Amended and Restated
Stockholders' Agreement dated January __, 2000 among Jato Communications Corp.
and the Investors set forth therein, the undersigned hereby executes this
Additional Party Signature Page and authorizes this signature page to be
attached as a counterpart of such agreement and agrees to be bound by such
agreement as if the undersigned had executed such agreement on the date of its
original execution.

This Additional Party Signature Page may be executed in counterparts, each of
which shall be deemed an original but all of which shall constitute one and the
same instrument.

DATE:
       -----------------

                                   --------------------------------
                                   Print Name of Investor

                                   By:
                                      --------------------------------

                                   Name:
                                        ------------------------------
                                   Title:
                                         -----------------------------

                                      B-7<PAGE>

[LOGO]

                            MASTER SERVICES AGREEMENT

THIS MASTER SERVICES AGREEMENT ("Master Agreement") is made and entered into
as of this 9th day of February, 2000 ("Effective Date") by and between QWEST
COMMUNICATIONS CORPORATION, a Delaware corporation or its Affiliates (as
defined herein) (collectively referred to as "Qwest"), having a principal
place of business at 555 Seventeenth Street, Denver, Colorado 80202
("Qwest"), and JATO COMMUNICATIONS CORP., a  Delaware corporation ("Jato"),
having a principal place of business at 1099 18th Street, Suite 2200, Denver,
Colorado 80202.   (Qwest and Jato are collectively referred to herein as the
"Parties", or individually as a "Party").

WHEREAS, Jato desires to purchase from Qwest, and Qwest desires to sell to
Jato, on a preferred provider basis, certain wholesale telecommunications,
Internet and data services (collectively, the "Qwest Services").

WHEREAS, Qwest desires to purchase from Jato, and Jato desires to sell to
Qwest, on a preferred provider basis, digital subscriber line ("DSL")
services (collectively, the "Jato Services").

WHEREAS, Qwest desires to purchase an equity interest in Jato.

NOW THEREFORE, the Parties agree as follows:

1.  DEFINITIONS.

(1) Backbone Transport - "Backbone Transport" shall collectively refer to
    Qwest's asynchronous transfer mode ("ATM") and DS-3 and OC-n leased private
    line services.
(2) DSL Services - "DSL Services" shall mean those digital subscriber line
    services furnished by a Party.
(3) Frame Relay Services - "Frame Relay Services" shall refer to Qwest's frame
    relay services.
(4) IP Services - "IP Services" shall collectively refer to dedicated Internet
    access ("DIA") services, web hosting services, and virtual private network
    ("VPN") services (including, without limitation, network, customer premises
    equipment ("CPE"), dial and DSL).
(5) Metro Backhaul - "Metro Backhaul" shall mean local services utilized to
    provide connectivity from Jato's central offices where Jato's DSL equipment
    is located to Jato switching centers in cities where Qwest's backbone
    service areas overlap.
(6) Qwest Agreements - "Qwest Agreements" shall collectively refer to the
    Wholesale Agreement (as defined in Section 2.1(1)) and the IP Agreement (as
    defined in Section 2.1(2)).

2.  MASTER AGREEMENT; SERVICES.

2.1   MASTER AGREEMENT.  The parties shall concurrently with the execution of
this Master Agreement enter into the following ancillary agreements: (i) the
stock purchase agreement and related documents (the "Equity Agreements"); and
(ii) the following agreements (each, a "Service Agreement," and collectively
referred to as the "Services Agreements").  The parties agree that the terms
and conditions of this Master Services Agreement will be incorporated into
the Services Agreements in full by this reference:

(1) Qwest Wholesale Services Agreement (the "Wholesale Agreement") for the
    provision of Backbone Transport and Frame Relay Services by Qwest;
(2) Qwest Web Master Internet Services Agreement (the "IP Agreement") for the
    provision of IP Services (other ancillary professional services furnished
    by Qwest that are related to the IP Services will be handled in a separate
    professional services agreement, to be negotiated in good faith by the
    Parties); and
(3) Jato Services Agreement (the "Jato Agreement") for the provision of DSL
    Services to Qwest by Jato.

DJS/Jato                          Page 1 of 6                          02/09/00
                               QWEST CONFIDENTIAL
<PAGE>

The Parties acknowledge and agree that certain Services Agreements may not be
finalized and executed by the Parties on or before the Effective Date.
Accordingly, the Parties agree to negotiate in good faith and execute those
Services Agreements that have not been executed as of the Effective Date.  If
the Parties are unable, after good faith negotiations, to execute any Service
Agreement, the Parties agree: (i) that such failure shall not constitute a
default under this Master Agreement, and (ii) that the amount of Jato's Usage
Commitment and Prepayment Amount shall be reduced pro rata by the amount of
the Qwest Agreements which the Parties were unable to execute.

2.2  QWEST DSL SERVICES.  Qwest anticipates that it will be able to provide
Jato with wholesale DSL Services by Q4 2000, although Qwest's inability to
provide Jato DSL Services by such date shall not constitute a breach of this
Master Agreement or any Service Agreement.  If Qwest is able to furnish Jato
with wholesale DSL Services, Qwest shall so notify Jato and the Parties will
negotiate in good faith a mutually agreeable amendment to the Wholesale
Agreement (the "DSL Amendment").  The DSL Amendment will confer upon Qwest
"preferred provider" status (as described herein) for those DSL Services
which Jato orders outside of its then-current service region, which the
Parties will mutually identify. Each DSL facility which Jato orders under the
DSL Amendment will have a minimum facility term of at least one (1) year.
Jato will use reasonable efforts, but does not guarantee, to supply Qwest
with a minimum of at least fifteen thousand (15,000) business-class DSL
subscribers during the Initial Term.  Jato acknowledges and agrees that it
must meet its revenue commitment for "Allotment" DSL Services by the
appropriate milestones as provided in Section 4.  In designating Qwest as its
"preferred provider" of DSL Services, Qwest will be Jato's first choice as a
DSL Service provider in the cities and central offices identified in the DSL
Amendment (that are identified as Qwest facility-based DSL networks and which
do not overlap with Jato's then-existing facilities-based DSL services).
Jato may award business to other providers if, after Qwest's "first right to
satisfy any order," Qwest is unable to meet Jato's end user service
requirements or service delivery schedules.

2.3  JATO DSL SERVICES.  In the Jato Agreement, Qwest will designate Jato as
a Qwest "preferred provider" of DSL services during the Initial Term as the
"last mile" access connection to Qwest's data communication networks to be
identified by the Parties.  In designating Jato its "preferred provider" of
DSL services, Jato will be Qwest's first choice as a DSL service provider in
the cities and central offices identified in the Jato Agreement, that do not
overlap with Qwest's DSL providers' existing as of the date of execution of
the Master Agreement and existing DSL footprint, and which do not overlap
areas where Qwest has deployed or plans to deploy its own facilities-based
DSL services. Qwest may award business to other providers if, after a right
of first refusal, Jato is unable to meet end customer service requirements or
service delivery schedules. Qwest shall make reasonable efforts to supply
Jato with a minimum of seventy five thousand (75,000) business-class DSL
subscribers during the Initial Term.  The subscriber commitment in the
previous sentence *** a "take or pay" arrangement.  Qwest will purchase each
circuit on a one (1) year term commitment.  A specific requirement of pricing
is that Jato will always *** wholesale ILEC pricing for comparable services.

2.4   METRO BACKHAUL.  The Parties agree to negotiate in good faith and
execute an agreement for Metro Backhaul Services within and outside the US
West, Inc. ("US West") territories.  The Parties acknowledge and agree that
Qwest's ability to provide Metro Backhaul to Jato within the US West
territories is contingent upon the consummation of Qwest's proposed merger
with US West, which is subject to certain legal and regulatory approvals and
restrictions (the "US West Merger").  Jato acknowledges and agrees that
Qwest's current inability to provide Metro backhaul to Jato shall not
constitute a breach of this Master Agreement or any Qwest Agreement.  In the
event the US West Merger is consummated and Qwest, as a result of such
merger, is reasonably able to provide Metro backhaul in the US West territory
to Jato, Qwest shall so notify Jato and the Parties will negotiate in good
faith a mutually agreeable amendment to an existing Qwest Agreement or new
services agreement.

3.  TERM; TERMINATION.

3.1   The term of this Master Agreement shall commence on the Effective Date
and remain in effect for five and one-half (5.5) Annual Periods (as defined
herein) (the "Initial Term").   After the expiration of the Initial Term,
this Master Agreement shall continue so long as a Services Agreement remains
in effect unless and until terminated by either Party (the Initial Term and
any extension by way of existing Services Agreement shall be collectively
referred to as the "Term"). As used herein, "Annual Period" shall refer to:
(i) the twelve (12) consecutive month period commencing on the Effective Date
of this Agreement ("First Annual Period"); and (ii) to each subsequent twelve

                                           ***Text Omitted and Filed Separately
                                               Confidential Treatment Requested
                                         Under 17 C.F.R. SECTIONS 200.80(b)(4),
                                                           200.83 and 240.24b-2

DJS/Jato                          Page 2 of 6                          02/09/00
                               QWEST CONFIDENTIAL
<PAGE>

(12) month period of the Term commencing on the anniversary date of the First
Annual Period (the last 6 month period of the Initial Term shall also be
deemed an Annual Period).

3.2   In addition to any other termination remedies set forth in the Qwest
Agreements, Jato may terminate: (i) the Master Agreement (but not the Equity
Agreement) prior to the expiration of the Initial Term if Jato has attained
its twenty-five million ($25,000,000.00) Usage Minimum (as defined below) and
has satisfied in full all minimum facility service terms associated with the
Qwest Services; or (ii) a Qwest Agreement prior to the expiration of the such
Qwest Agreement if Jato attains the minimum revenue commitment associated
with such Qwest Agreement(s) and has satisfied in full all minimum facility
service terms associated with the Qwest Services. Qwest may terminate the
Jato Agreement in accordance with its terms.  A Party wishing to terminate
any agreement hereunder must give the non-terminating Party thirty (30)
calendar days prior written notice of the intended date of such termination.

4.  USAGE COMMITMENTS.

4.1   USAGE MINIMUM; ANNUAL REVENUE SHORTFALL CHARGE.  Jato shall pursuant to
the terms and conditions of the Qwest Agreements and this Master Agreement,
purchase Qwest Services during the Initial Term of at least twenty-five
million dollars ($25,000,000.00) ("Usage Minimum"), which is calculated as
having a present value of sixteen million dollars ($16,000,000.00) (the "PV
Usage Minimum"), which amount shall be paid to Qwest *** in accordance with
Section 5.  Jato shall purchase Qwest Services in accordance with the total
amount of revenue commitments ("Annual Totals") at the Annual Period
milestones set forth in Table 4.1 below:

<TABLE>
<CAPTION>
Table 4.1  Usage Minimums for Qwest Services.
---------------------------------------------------------------------------------------------------------------------
                                                            Annual Period
---------------------------------------------------------------------------------------------------------------------
                      # 1            # 2           # 3           # 4           # 5           # 6
Service           Months 0-12   Months 13-24  Months 25-36   Months 37-48  Months 49-60   Months 61-66      Totals
---------------------------------------------------------------------------------------------------------------------
<S>             <C>            <C>            <C>            <C>           <C>            <C>            <C>
Backbone
Transport                 ***            ***            ***            ***           ***            ***           ***
---------------------------------------------------------------------------------------------------------------------
Frame Relay               ***            ***            ***            ***           ***            ***           ***
---------------------------------------------------------------------------------------------------------------------
IP Services               ***            ***            ***            ***           ***            ***           ***
---------------------------------------------------------------------------------------------------------------------
* Overallotment
 (including
 Metro Backhaul,
 DSL Services,
 and other
 services)                ***            ***            ***            ***           ***            ***           ***
---------------------------------------------------------------------------------------------------------------------
Annual Totals             ***            ***            ***            ***           ***            ***           ***
---------------------------------------------------------------------------------------------------------------------
</TABLE>

* Jato's total Actual Usage of Metro Backhaul Services shall not exceed ***
during the Initial Term.

If at the end of each Annual Period, Jato's Actual Usage as measured during
such Annual Period of the Qwest Services is less than the Annual Total
minimum set forth in Table 4.1, Jato will be liable for a shortfall charge
equal to the difference between the Annual Total minimum and Jato's
aggregate, Actual Usage (as defined herein) invoiced under the Qwest
Agreements (the "Annual Shortfall Charge").  (By way of example, and not
limitation, if Jato's aggregate, Actual Usage at the end of the second Annual
Period is ***, Jato will be liable for an Annual Shortfall Charge in the
amount of *** (calculated as ***)).  Qwest shall, within a reasonable period
of time after the conclusion of the Annual Period and upon thirty (30)
calendar days written notice to Jato, reduce the Prepayment Amount by an
amount equal to the Annual Shortfall Charge, or alternatively if the
remaining Prepayment Amount is insufficient to cover the full amount of the
Annual Shortfall Charge, invoice Jato for the Annual Shortfall Charge.

4.2   ACTUAL USAGE OF SPECIFIC SERVICES DOES NOT MEET EXPECTATIONS AT THE END
OF THE INITIAL TERM.  If at the end of the Initial Term, Jato's Actual Usage
(as defined herein) of any of the specific Qwest Services (except Metro
Backhaul services) is less than the Usage Minimum set forth in Table 4.1,
Qwest will invoice Jato at the conclusion of the Initial Term for the
Services Shortfall Charge (as defined herein) and Jato shall be liable for
and pay the Services Shortfall Charge within thirty (30) calendar days of
after receipt of Qwest's invoice.  The Services Shortfall Charge shall be an
amount equal to the difference between the Usage Minimum and the Actual Usage
invoiced

                                           ***Text Omitted and Filed Separately
                                               Confidential Treatment Requested
                                         Under 17 C.F.R. SECTIONS 200.80(b)(4),
                                                           200.83 and 240.24b-2

DJS/Jato                          Page 3 of 6                          02/09/00
                               QWEST CONFIDENTIAL
<PAGE>

under the Qwest Agreement for specific Qwest Services, in addition to being
liable for the payment of unpaid Actual Usage charges (if any).  "Actual
Usage" shall mean all recurring charges, usage charges and other qualifying
charges applicable to the Qwest Services accruing to Jato's account under the
Qwest Agreements, before application of all eligible discounts and excluding
all taxes, surcharges, fees and other amounts owing for or related to,
credits, uncollectable Jato charges, pass-through charges, installation
charges, local loops and any other charges expressly excluded in the
applicable Qwest Agreements.  (By way of example, and not limitation, if
Jato's aggregate, Actual Usage of Frame Relay Services at the end of the
Initial Term is ***, Jato will be liable for a Services Shortfall Charge in
the amount of *** (calculated as ***)).

4.3   JATO TERMINATES QWEST SERVICE OR AN AGREEMENT FOR CAUSE.

If Jato terminates a Qwest Service or a Qwest Agreement for "cause" (as
described in the Qwest Agreements) prior to the end of the Initial Term and
prior to the satisfaction of the Usage Minimum during each of the Annual
Periods, the amount of revenue associated with the terminated Qwest
Service(s) or Qwest Agreement(s), as the case may be (collectively, the
"Terminated Revenue"), shall be reallocated on a pro rata basis amongst the
non-terminated Qwest Services.  If as a result of terminating the Qwest
Service(s) or the Qwest Agreement(s), Jato is unable to meet its Usage
Minimum in any given Annual Period set forth in Table 4.1, Qwest shall reduce
Jato's Usage Minimum accordingly for such Annual Period by the amount of the
Terminated Revenue.

4.4   JATO TERMINATES AN AGREEMENT FOR CONVENIENCE OR QWEST TERMINATES FOR
CAUSE.

If Jato terminates the Qwest Agreements for "convenience" (i.e., for any
reason other than "cause" as described in the Qwest Agreements) or Qwest
terminates the Qwest Agreements for "cause" (as described in the Qwest
Agreements) prior to the end of the Initial Term and prior to the
satisfaction of the Usage Minimum during each of the Annual Periods, Jato
shall pay to Qwest upon termination an amount equal to: (i) the Shortfall
Charge for the terminated Qwest Services during the Annual Period in which
the Qwest Agreement is terminated; plus (ii) the Usage Minimum for the
terminated Qwest Services for each additional Annual Period remaining in the
Initial Term, in addition to being liable for the payment of unpaid Actual
Usage charges (if any).  (By way of example, and not limitation, if Jato
terminates the Frame Relay Services of the Wholesale Agreement for
convenience during month fifty (50) of the Initial Term (i.e., Annual Period
#5) and has had *** of Actual Usage in Frame Relay Services as of the
effective date of such termination, Jato shall be liable for and pay an
amount equal to ***, which is calculated as follows: (i) *** (which is the
Shortfall Charge for the current Annual Period, calculated as the difference
between the Frame Relay Usage Minimum of *** minus the Frame Relay Actual
Usage of ***), plus (ii) *** (which is the Usage Minimum for the terminated
Frame Relay Services for the remaining Annual Period (i.e., Annual Period #6)
of the Initial Term.)

5.  PREPAYMENT.

5.1   Subject to the completion of Jato's IPO, Jato shall prepay Qwest,
within ten (10) business days after Jato's IPO, sixteen million dollars
($16,000,000.00) (the "Prepayment Amount") to be applied against the purchase
of Qwest Services under the Wholesale Agreement and IP Agreement (and any
other Qwest Service Agreement(s) between the Parties), calculated as having a
value of twenty-five million dollars ($25,000,000.00) over the Initial Term.
Qwest shall not be liable to pay Jato any accrued interest on the Prepayment
Amount, provided however, that interest shall accrete on the Outstanding
Prepayment Balance Amount monthly (the "Accretion Interest"), such Accretion
Interest shall be calculated at an annual accretion rate of *** percent (the
"Accretion Rate"), and be added to the Prepayment Amount.  Accretion will not
commence until after Qwest receives the Prepayment Amount.  Upon Qwest
calculating Jato's monthly interest accretion, Qwest shall invoice Jato
monthly for Jato's use of the Qwest Services and, upon thirty (30) days after
the date of such invoice, decrease the Prepayment Amount by the undisputed
amount of Qwest's invoice.  Pursuant to Section 4 herein, any undisputed
shortfall charges or early termination fees set forth in this Master
Agreement or any Qwest Agreement may be applied against and drawn down from
the Prepayment Amount, so long as Qwest gives Jato thirty (30) calendar days
prior written notice and other detailed written documentation supporting such
charges or fees.  So long as the Prepayment Amount has not been fully drawn
down by Qwest, Qwest shall not be entitled to: (i) suspend the Qwest Services
or terminate the Qwest Agreements for non-payment of any invoices; or (ii)
request additional security pursuant to Section 6.3 of the

                                           ***Text Omitted and Filed Separately
                                               Confidential Treatment Requested
                                         Under 17 C.F.R. SECTIONS 200.80(b)(4),
                                                           200.83 and 240.24b-2

DJS/Jato                          Page 4 of 6                          02/09/00
                               QWEST CONFIDENTIAL
<PAGE>

Wholesale Agreement.  Once the Prepayment Amount has been fully exhausted,
Jato shall be responsible for paying its Qwest invoices in accordance with
the "payment" sections of the Qwest Agreements.

5.2   Until Jato prepays the Prepayment Amount or if, during the Initial
Term, the aggregate amount of the Qwest invoices exceeds the Prepayment
Amount, Qwest shall invoice Jato monthly for Jato's use of the Qwest Services
for the balance of the Initial Term, and Jato shall be responsible for paying
such invoices in accordance with the "payment" sections of the Qwest
Agreements.  The Parties shall each submit detailed quarterly reports
indicating, among other things, the amount of Jato's Actual Usage, Usage
Minimum, the Prepayment Amount, and interest accretion (although the failure
of Qwest to submit or demand such report shall not be deemed a default or any
waiver of any right hereunder).

5.3   Until Jato consummates its IPO, the provisions set forth in Section 5.1
shall not apply, and Qwest shall invoice Jato for Qwest Services used by Jato
in the manner set forth in the Qwest Agreements, and Jato shall be
responsible for complying with all of the payment provisions contained in the
Qwest Agreements.  The failure of Jato to consummate its IPO shall not
relieve Jato of any of its obligations hereunder (except that Jato shall not
be responsible for providing the Prepayment Amount to Qwest).  All Qwest
Services purchased by Jato, whether pre-Jato IPO or post-Jato IPO, shall
count towards and contribute to the Usage Minimums.  Upon consummation of the
US West Merger, the Parties shall negotiate in good faith and execute
amendment(s) to an existing Qwest Agreement and/or new services agreement(s),
such that, any backbone transport, DSL services, frame relay services, IP
services, and metro backhaul services purchased thereafter from US West by
Jato shall count towards and contribute to the Usage Minimums, subject to the
Metro Backhaul cap of *** set forth in Section 4.1.

6.  CONFIDENTIALITY.

Neither Party shall make any disclosure of this Master Agreement, the
Services Agreement, or the transactions contemplated hereby without first
obtaining the written approval of the other Party, except to the extent that
additional disclosure may be required by law, in which case, the Party
required to make such disclosure will give the other Party prior notice
thereof.  The provisions of this paragraph shall be binding upon the Parties
and shall survive any termination of this Master Agreement, any or all of the
Service Agreements, or any other agreement between the Parties and shall
remain in effect for a period of twelve (12) months following conclusion of
the Term.  The Parties agree that they will not make public announcements
(i.e., other than to a Party's advisors) or issue press releases regarding
this Master Agreement or the transactions contemplated hereunder without the
prior written consent of the other Party.

7.   QWEST AFFILIATE.

For purposes of this Agreement, Qwest shall be considered to include any
"Qwest Affiliate," where a "Qwest Affiliate" shall mean any entity: (i) which
controls, is controlled by, or is under common control with Qwest; or (ii) in
which Qwest owns an equity interest of not less than ***.

8.   MISCELLANEOUS.

(a)   Any dispute relating to this Master Agreement shall be submitted for
binding arbitration under the Commercial Arbitration Rules of the American
Arbitration Association and judgment on any award entered therein may be
entered in any court of competent jurisdiction.  The venue for any such
arbitration shall be Denver, Colorado.

(b)   In the event that any portion of this Master Agreement is held to be
unenforceable, the unenforceable portion shall be construed as nearly as
possible to reflect the original intent of the Parties and the remainder of
the provisions shall remain in full force and effect.

(c)   A Party's failure to insist upon strict performance of any provision of
this Master Agreement shall not be construed as a waiver of any of its rights
hereunder.

                                           ***Text Omitted and Filed Separately
                                               Confidential Treatment Requested
                                         Under 17 C.F.R. SECTIONS 200.80(b)(4),
                                                           200.83 and 240.24b-2

DJS/Jato                          Page 5 of 6                          02/09/00
                               QWEST CONFIDENTIAL
<PAGE>

(d)   Each Party hereto is an independent contractor.  Nothing in this Master
Agreement shall constitute or create a joint venture, partnership, or any
other similar arrangement between Jato and Qwest.  Neither Party is
authorized to act as agent or bind the other Party except as expressly stated
in this Master Agreement.

(e)   Notwithstanding anything to the contrary herein, in no event shall a
Party shall be liable to the other for any direct, indirect, consequential,
exemplary, special, incidental or punitive damages, or for any lost profits
of any kind or nature whatsoever, even if foreseeable, arising out of or
resulting from the failure to finalize or execute any or all of the Services
Agreements, even if the Party has been advised, knew or should have know of
the possibility of such damages.

(f)   Subject to and without limiting any express assignment rights set forth
in the Equity Agreement or the Services Agreements, Jato shall not assign
this Master Agreement without first obtaining the prior written consent of
Qwest, which consent shall not be unreasonably withheld or delayed.

(g)   This Master Agreement will be governed by and interpreted under the
laws of the State of New York, without giving effect to applicable conflicts
of law principles.  Any cause of action Jato may have with respect to the
Services must be commenced within one (1) year after the claim or cause of
action arises or such claim or cause of action is barred.  In any proceeding
to enforce the terms of this Master Agreement, the Party prevailing shall be
entitled to recover all of its expenses, including, without limitation,
reasonable attorney's fees.

(h)   Each Party will bear its own expenses in connection with this Master
Agreement, including the Service Agreements.

(i)   The terms and conditions contained in a specific Service Agreement
shall apply only to and within that Service Agreement.  In the event of any
conflict between any or all of the terms and conditions contained in a
specific Service Agreement and this Master Agreement, the terms and
conditions contained in a specific Service Agreement shall prevail and be the
definitive guide to interpretation of the intent and rights and obligations
of the Parties; provided, however, the provisions of Sections 2.1, 2.4, 3.1,
3.2, 4.1, 4.2, 4.3, 4.4, 5.1, 5.2 and 5.3 of this Master Agreement shall
supplement and prevail, to the extent inconsistent, those similar terms
contained in a specific Service Agreement.

(j)   This Master Agreement, including the Service Agreements which are
referenced herein, constitutes the entire agreement between Jato and Qwest
with respect to the Services.  This Master Agreement may only be amended in a
written agreement executed by authorized representatives of both Parties
hereto.

The rights of Qwest set forth in this Master Agreement shall inure to Qwest
and all of its affiliates.  The Parties have caused this Agreement to be
executed and warrant that their respective signatories are authorized to
execute this Agreement as of the Effective Date.

QWEST COMMUNICATIONS CORPORATION       JATO COMMUNICATIONS CORP.

By: /s/ Augie Cruciotti                By: /s/ William D. Myers
   -----------------------------          -----------------------------
Augie Cruciotti                        William D. Myers
Senior Vice President                  Chief Financial Officer
Date: 02/09/00                         Date: 02/09/00
     ---------------------------            ---------------------------

DJS/Jato                          Page 6 of 6                          02/09/00
                               QWEST CONFIDENTIAL

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