Document:

EXHIBIT 10.24
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                               SECURITY AGREEMENT

         This SECURITY AGREEMENT ("AGREEMENT"), dated as of December 27, 2002,
is made between each entity set forth on the signature pages hereto as a grantor
(each such entity and each entity which hereafter executes and a Subsidiary
Joinder in substantially the form of Attachment 1 to the Guaranty (as defined
below) to be referred to herein as a "GRANTOR", and collectively as, the
"GRANTORS") and VantagePoint Venture Partners III (Q), L.P., as administrative
agent for itself and the other Guarantors which are or may become parties to the
Reimbursement Agreement ("AGENT").

                                    RECITALS
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         A. Reference is made to that certain Revolving Credit and Term Loan
Agreement, dated as of December 13, 2002 (as amended and in effect from time to
time, the "CREDIT AGREEMENT"), by and between Fleet National Bank ("LENDER") and
DSL.net, Inc. ("BORROWER").

         B. It is a condition precedent to the extension of credit by Lender
under the Credit Agreement that the Guarantors party to the Reimbursement
Agreement enter into guaranties (as amended and in effect from time to time, the
"CREDIT GUARANTIES" and each a "CREDIT GUARANTY") to guaranty certain of the
obligations of Borrower to Lender under the Credit Agreement.

         C. In order to induce Guarantors to enter into the Credit Guaranty, (i)
Borrower has agreed to enter into a Reimbursement Agreement, dated as of the
date hereof (as amended and in effect from time to time, the "REIMBURSEMENT
AGREEMENT"), (ii) certain of Borrower's subsidiaries party hereto have agreed to
enter into a Subsidiary Guaranty (as amended and in effect from time to time,
the "GUARANTY") to guaranty Borrower's obligations to Guarantors under the
Reimbursement Agreement and (iii) Borrower and the other Grantors have agreed to
enter into this Security Agreement, dated as of the date hereof, to secure their
respective obligations under the Reimbursement Agreement and the Guaranty.

         D. Terms defined in the Reimbursement Agreement and not otherwise
defined herein have the same respective meanings when used herein.

                                    AGREEMENT
                                    ---------

         NOW, THEREFORE, in order to induce Agent and Guarantors to enter into
the Reimbursement Agreement and for other good and valuable consideration, the
receipt and adequacy of which hereby is acknowledged, each Grantor hereby
represents, warrants, covenants, agrees and grants as follows:

         1.   DEFINITIONS. Unless the context otherwise requires, terms defined
in the Uniform Commercial Code of the State of California (the "UNIFORM
COMMERCIAL CODE") and not otherwise defined in this Agreement or in the
Reimbursement Agreement shall have the meanings defined for those terms in the
Uniform Commercial Code. In addition, the following terms shall have the
meanings respectively set forth after each:

         "CERTIFICATES" means all certificates, instruments and other documents
now or hereafter representing or evidencing any Pledged Securities or Pledged
Limited Liability Company Interests.

         "CLOSING DATE" shall mean the date of this Agreement.

         "COLLATERAL" means and includes all present and future right, title,
interest, claims and demands of each Grantor in or to any personal property or
assets whatsoever, whether now owned or existing or hereafter arising or
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acquired and wheresoever located, including without limitation, any and all of
the following personal property:

              (a) All present and future accounts, accounts receivable, payment
intangibles, agreements, guaranties, contracts (collectively, the "ACCOUNTS"),
together with all instruments, documents, chattel paper, security agreements,
guaranties, undertakings, surety bonds, insurance policies, notes and drafts,
and all forms of obligations owing to such Grantor or to which such Grantor may
have an interest, however created or arising;

              (b) All present and future general intangibles, including without
limitation, (i) all tax refunds of every kind and nature to which such Grantor
now or hereafter may become entitled, however arising, (ii) all other refunds,
(iii) all commitments to extend financing to such Grantor, (iv) all deposits,
(v) all goodwill, (vi) all choses in action, (vii) all insurance proceeds, and
(viii) all trade secrets, computer programs, software, customer lists,
trademarks (excluding Intent to Use Applications), trade names, patents,
licenses, copyrights, technology, processes and proprietary information,
including without limitation, the Copyrights, the Patents and the Marks and the
goodwill of such Grantor's business connected with and symbolized by the Marks;

              (c) All present and future demand, time, savings, passbook,
deposit and like accounts (general or special) (collectively, the "DEPOSIT
ACCOUNTS") in which such Grantor has any interest which is maintained with any
bank, savings and loan association, credit union or like organization, including
without limitation, each account listed on Schedule 1-B attached hereto and all
money, cash and cash equivalents of such Grantor, whether or not deposited in
any Deposit Account;

              (d) All present and future books and records, including without
limitation, books of account and ledgers of every kind and nature, all
electronically recorded data relating to such Grantor, all receptacles and
containers for such records, and all files and correspondence;

              (e) All present and future goods, including without limitation,
all equipment, machinery, tools, molds, dies, furniture, furnishings, fixtures,
trade fixtures and all other goods used in connection with or in the conduct of
such Grantor's business (collectively, the "EQUIPMENT");

              (f) All present and future inventory and merchandise, including
without limitation, all present and future goods held for sale or lease or to be
furnished under a contract of service, all recorded media, all raw materials,
work in process and finished goods, all packing materials, supplies and
containers relating to or used in connection with any of the foregoing, and all
bills of lading, warehouse receipts and documents of title relating to any of
the foregoing (collectively, the "INVENTORY");

              (g) All present and future commodity accounts, securities
accounts, investment and/or brokerage accounts and similar accounts, including
without limitation, each account listed on Schedule 1-B attached hereto
(collectively, "INVESTMENT ACCOUNTS"), all stocks, bonds, debentures,
certificated and uncertificated securities, security entitlements, subscription
rights, options, warrants, puts, calls, certificates, commodity contracts,
partnership interests, limited liability company interests, joint venture
interests, and all other investment property, including without limitation, the
Certificates, the Pledged Securities, the Pledged Partnership Interests, the
Pledged Limited Liability Company Interests and all rights, preferences,
privileges, dividends, distributions (in cash or in kind), redemption payments
or liquidation payments with respect thereto;

              (h) All present and future accessions, appurtenances, components,
repairs, repair parts, spare parts, replacements, substitutions, additions,
issue and/or improvements to or of or with respect to any of the foregoing;

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              (i) All other tangible and intangible personal property of such
Grantor not specifically excluded from this definition of "Collateral";

              (j) All rights, remedies, powers and/or privileges of such Grantor
with respect to any of the foregoing; and

              (k) Any and all proceeds and products of the foregoing, including
without limitation, all money, accounts, general intangibles, deposit accounts,
documents, instruments, chattel paper, goods, insurance proceeds and any other
tangible or intangible property received upon the sale or disposition of any of
the foregoing.

         Notwithstanding the foregoing, the term "Collateral" shall not include
(i) any Equipment that is subject to a Lien otherwise permitted by subsections
(vi), (vii) or (viii) of the definition of Permitted Liens, (ii) cash collateral
securing letters of credit, provided that such cash collateral is pledged prior
to the date of demand by Lender for payment under the Credit Guaranties, (iii)
assets acquired subsequent to the date of this Agreement that are subject to a
security interest, provided that such security interest is limited to the asset
acquired and (iv) all equity interests in Regulated Entities; provided that each
of the assets referenced in clause (i), (ii) and (iii) of this sentence shall be
deemed to be Collateral and the Debtor shall be deemed to have granted a
security interest in, all of its right, title and interests in such assets, upon
the ineffectiveness, lapse or termination of the security interests referenced
in clauses (i), (ii) or (iii) of this sentence.

         "COPYRIGHT" means all:

              (a) Copyrights, whether or not published or registered under the
Copyright Act of 1976, 17 U.S.C. Section 101 et seq., as the same shall be
amended from time to time and any predecessor or successor statute thereto (the
"COPYRIGHT ACT"), and applications for registration of copyrights, and all works
of authorship and other intellectual property rights therein, including without
limitation, copyrights for computer programs, source code and object code
databases and related materials and documentation and including without
limitation, the registered copyrights and copyright applications listed on
Schedule 1-H attached hereto, and (i) all renewals, revisions, derivative works,
enhancements, modifications, updates, new releases and other revisions thereof,
(ii) all income, royalties, damages and payments now and hereafter due and/or
payable with respect thereto, including without limitation, payments under all
licenses entered into in connection therewith and damages and payments for past
or future infringements thereof, (iii) the right to sue for past, present and
future infringements thereof and (iv) all of such Grantor's rights corresponding
thereto throughout the world;

              (b) Rights under or interests in any copyright license agreements
with any other party, whether each Grantor is a licensee or licensor under any
such license agreement and the right to use the foregoing in connection with the
enforcement of the Agent's rights under the Operative Documents; and

              (c) Copyrightable materials now or hereafter owned by such
Grantor, including without limitation, all tangible property embodying the
copyright described in clause (a) hereof or such copyrightable materials, and
all tangible property covered by the licenses described in clause (b) hereof.

         "GUARANTEED OBLIGATIONS" has the meaning given to that term in the
Guaranty.

         "GUARANTOR" has the meaning given to that term in the Reimbursement
Agreement.

         "ISSUER ACKNOWLEDGEMENT" has the meaning given to that term in Section
3(b) of this Agreement.

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<PAGE>
         "INTENT TO USE APPLICATION" means any application of the type described
in 15 United States Code Section 1051(b) that has been or may hereafter be filed
by the Borrower with the United States Patent and Trademark Office.

         "LIENS" has the meaning given to that term in the Reimbursement
Agreement.

         "LIMITED LIABILITY COMPANY INTERESTS" means the entire limited
liability company interest at any time owned by each Grantor in any Pledged
Entity.

         "MARKS" means all (a) trademarks, trademark registrations, interest
under trademark license agreements, trade names, trademark applications, service
marks, business names, trade styles, designs, logos and other source or business
identifiers for which registrations have been issued or applied for in the
United States Patent and Trademark Office or in any other office or with any
other official anywhere in the world or which are used in the United States or
any state, territory or possession thereof, or in any other place, nation or
jurisdiction anywhere in the world including without limitation, the trademarks,
trademark registrations, applications, service marks, business names, trade
styles, design logos and other source or business identifiers listed on Schedule
1-F attached hereto, but excluding any Intent to Use Applications, (b) licenses
pertaining to any such mark whether such Grantor is licensor or licensee, (c)
all income, royalties, damages and payments for past, present or future
infringements thereof, (d) rights to sue for past, present and future
infringements thereof, (e) rights corresponding thereto throughout the world,
(f) all product specification documents and production and quality control
manuals used in the manufacture of products sold under or in connection with
such marks, (g) all documents that reveal the name and address of all sources of
supply of, and all terms of purchase and delivery for, all materials and
components used in the production of products sold under or in connection with
such marks, (h) all documents constituting or concerning the then current or
proposed advertising and promotion by such Grantor, their subsidiaries or
licensees of products sold under or in connection with such marks, including
without limitation, all documents that reveal the media used or to be used and
the cost for all such advertising conducted within the described period or
planned for such products and (i) renewals and proceeds of any of the foregoing.

         "MATERIAL ADVERSE EFFECT" has the meaning given to that term in the
Reimbursement Agreement.

         "OBLIGATIONS" with respect to Borrower, such term has the meaning given
to that term in the Reimbursement Agreement and with respect to Guarantors, such
term means the Guaranteed Obligations.

         "OPERATIVE DOCUMENTS" has the meaning given to that term in the
Reimbursement Agreement.

         "PATENTS" means all (a) letters patent, design patents, utility
patents, inventions and trade secrets, all patents and patent applications in
the United States Patent and Trademark Office, and interests under patent
license agreements, including without limitation, the inventions and
improvements described and claimed therein, including without limitation, those
patents listed on Schedule 1-G attached hereto, (b) licenses pertaining to any
patent whether such Grantor is licensor or licensee, (c) income, royalties,
damages and payments now and hereafter due and /or payable under and with
respect thereto, including without limitation, damages and payments for past,
present or future infringements, (d) rights to sue for past, present and future
infringements thereof, (e) rights corresponding thereto throughout the world in
all jurisdictions in which such patents have been issued or applied for and (f)
the reissues, divisions, continuations, renewals, extensions and
continuations-in-part of any of the foregoing.

         "PERMITTED LIENS" has the meaning given to that term in the
Reimbursement Agreement.

         "PERSON" has the meaning given to that term in the Reimbursement
Agreement.

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<PAGE>
         "PARTNERSHIP INTERESTS" means the entire partnership interest at any
time owned by each Grantor in any Pledged Partnership Entity.

         "PLEDGED COLLATERAL" means the Certificates, the Pledged Securities,
the Pledged Partnership Interests and the Pledged Limited Liability Company
Interests.

         "PLEDGED ENTITY" means each limited liability company set forth in
Schedule 1-C attached hereto, together with any other limited liability company
(other than a Regulated Entity) in which any Grantor may have an interest at any
time.

         "PLEDGED LIMITED LIABILITY COMPANY INTERESTS" means all limited
liability company interests (other than in, of or with respect to a Regulated
Entity) held by each Grantor, including, but not limited to those limited
liability company interests set forth in Schedule 1-C attached hereto, as such
Schedule may be supplemented from time to time in accordance with the terms of
this Agreement and all capital, limited liability company assets, dividends,
cash, instruments and other properties from time to time received, to be
received or otherwise distributed in respect of or in exchange for any or all of
such interests and all certificates and instruments representing or evidencing
such other property received, receivable or otherwise distributed in respect of
or in exchange for any or all thereof.

         "PLEDGE NOTICE" shall have the meaning ascribed to it in Section 3(b)
of this Agreement.

         "PLEDGED PARTNERSHIP ENTITY" means each partnership interest set forth
in Schedule 1-C attached hereto, together with any other partnership interest
(other than in, of or with respect to a Regulated Entity) in which any Grantor
may have an interest at any time.

         "PLEDGED PARTNERSHIP INTERESTS" means all interests in any partnership
or joint venture held by each Grantor (other than in, of or with respect to a
Regulated Entity), including, but not limited to those partnership interests set
forth in Schedule 1-C attached hereto, as such Schedule may be supplemented from
time to time in accordance with the terms of this Agreement, and all dividends,
cash, instruments and other properties from time to time received, to be
received or otherwise distributed in respect of or in exchange for any or all of
such interests.

         "PLEDGED SECURITIES" means all shares of capital stock of each issuer
in which each Grantor has an interest (other than in, of or with respect to a
Regulated Entity), including, but not limited to those shares of capital stock
set forth in Schedule 1-C attached hereto, as such Schedule may be supplemented
from time to time in accordance with the terms of this Agreement, and all
dividends, cash, instruments and other properties from time to time received, to
be received or otherwise distributed in respect of or in exchange for any or all
of such shares.

         "REGULATED ENTITY" means any Person, subject to federal, state,
provincial, local or other statute, regulation or other law which limits,
restricts or affects the authority or ability of (i) such Person or (ii) the
owner of any equity interest in or of such Person, to enter into a guaranty of,
or grant a security interest in, or pledge of any of its assets to secure, the
indebtedness, liabilities or obligations of any other Person or affiliate
thereof.

         "REQUIRED GUARANTORS" has the meaning given to that term in the
Reimbursement Agreement.

         2.   CREATION OF SECURITY INTEREST. (a) Each Grantor, in order to
secure the Obligations, does hereby grant and pledge to Agent, for the benefit
of Guarantors and itself, a security interest in and to, all right, title and
interest of such Grantor in and to all presently existing and hereafter acquired

                                       -5-
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Collateral. The security interest and pledge created by this Section 2 shall
continue in effect so long as any Obligation remains outstanding.

              (b) Each Grantor may sell worn-out, obsolete or excess equipment,
provided that such sales are made on an arms length basis and upon the
consummation of such sales in the manner contemplated by this Section 2(b) the
security interest granted herein with respect to such worn-out, obsolete or
excess equipment shall be deemed released.

         3.   DELIVERY OF PLEDGED COLLATERAL.

              (a) Each Certificate shall, on (i) the Closing Date (with respect
to Certificates delivered on such date) and (ii) the day on which such
Certificate shall be received or acquired by a Grantor (with respect to any
Certificate received or acquired after the Closing Date), be delivered to and
held by Agent, and shall be in suitable form for transfer by delivery, or shall
be accompanied by duly executed undated endorsements, instruments of transfer or
assignment in blank, all in form and substance reasonably satisfactory to Agent.

              (b) With respect to each uncertificated Limited Liability Company
Interest and each uncertificated Partnership Interest, on (i) the Closing Date
(with respect such Limited Liability Company Interests and such Partnership
Interests existing on such date) and (ii) the day on which any such Limited
Liability Company Interest and any such Partnership Interest shall be acquired
by a Grantor (with respect to such Limited Liability Company Interests and such
Partnership Interests acquired after the Closing Date), a notice in the form set
forth in Exhibit A-1 attached hereto (the "Pledge Notice") shall be
appropriately completed and delivered to each Pledged Entity and each Pledged
Partnership Entity, notifying each Pledged Entity and each Pledged Partnership
Entity of the existence of this Agreement, a certified copy of this Agreement
shall be delivered by the Grantor to the relevant Pledged Entity and relevant
Pledged Partnership Entity, and such Grantor shall have received and delivered
to Agent a copy of such Pledge Notice, along with an acknowledgment in the form
set forth in Exhibit A-2 attached hereto (the "Issuer Acknowledgment"), duly
executed by the relevant Pledged Entity.

              (c) Agent (at the direction of the Required Guarantors (provided,
that if the Columbia Entities desire to take an enforcement action that Required
Guarantors have not consented to, the Agent shall take such enforcement action
as the Columbia Entities direct the Agent to take, provided further, that Agent
shall not take such enforcement action until the earlier of (A) the 120th day
after receipt by Agent of written notice of such enforcement action from the
Columbia Entities or (B) such time as the Required Guarantors have provided
their consent to such enforcement actions)) shall have the right, during the
existence of an Event of Default, without notice to any of the Grantors, in
connection with a commercially reasonable foreclosure sale, to transfer to, or
to direct the applicable Grantor or any nominee of such Grantor to register or
cause to be registered in the name of, Agent or any of its nominees any or all
of the Pledged Securities, Pledged Partnership Interests or Pledged Limited
Liability Company Interests. In addition, Agent, in furtherance of any action
referenced in the previous sentence, shall have the right at any time to
exchange certificates or instruments representing or evidencing Pledged
Securities for certificates or instruments of smaller or larger denominations.

         4.   FURTHER ASSURANCES.

              (a) At any time and from time to time at the reasonable written
request of Agent, each Grantor shall execute and deliver to Agent, at such
Grantor's expense, all such financing statements and other instruments,
certificates and documents (including account control agreements) in form and
substance reasonably satisfactory to Agent, and perform all such other acts as
shall be necessary or reasonably desirable to fully perfect or protect or
maintain, when filed, recorded, delivered or performed, Agent's security

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<PAGE>
interests granted pursuant to this Agreement or to enable Agent to exercise and
enforce its rights and remedies hereunder with respect to any Collateral.
Without limiting the generality of the foregoing, each Grantor shall: (i) at the
request of the Agent, mark conspicuously each document included in the Inventory
and each other contract relating to the Accounts, and all chattel paper,
instruments and other documents and each of its records pertaining to the
Collateral with a legend, in form and substance satisfactory to Agent,
indicating that such document, contract, chattel paper, instrument or Collateral
is subject to the security interest granted hereby, (ii) at the request of
Agent, if any Account or contract or other writing relating thereto shall be
evidenced by a promissory note or other instrument, deliver and pledge to the
Agent, such note or other instrument duly endorsed and accompanied by duly
executed undated instruments of transfer or assignment, all in form and
substance reasonably satisfactory to the Agent; (iii) execute and file such
financing or continuation statements, or amendments thereto, and such other
instruments or notices, as may be necessary or desirable, or as Agent may
reasonably request, in order to perfect and preserve, with the required
priority, the security interests granted, or purported to be granted hereby,
(iv) upon any Grantor's registration or application of any copyright under the
Copyright Act, execute and deliver promptly and in any event, within 5 days of
registration or application, to Agent for recordation and filing in the United
States Copyright Office a Grant of Security Interest, in the form of Exhibit B
attached hereto, (v) upon any Grantor's registration or application of any
Patent or Mark, execute and deliver promptly and in any event, with 5 days of
registration or application, to Agent for recordation and filing in the United
States Patent and Trademark Office a Grant of Security Interest, in the form of
Exhibit B attached hereto, and (vi) with respect to any license or agreement in
which any Grantor now has or hereafter acquires an interest which by its terms
prohibits assignment, upon Agent's request such Grantor will use its
commercially reasonable best efforts to procure the consent of the counterpart
party thereto.

              (b) At any time and from time to time, Agent shall be entitled to
file and/or record any or all such financing statements, instruments and
documents held by it, and any or all such further financing statements,
documents and instruments, relative to the Collateral or any part thereof in
each instance, and to take all such other actions as Agent may reasonably deem
appropriate to perfect and to maintain perfected the security interests granted
herein provided that Agent delivers copies thereof to the applicable Grantor(s)
substantially contemporaneously with such filing or recording.

              (c) Each Grantor hereby authorizes Agent to file one or more
financing or continuation statements, and amendments thereto, relative to all or
any part of the Collateral without the signature of such Grantor where permitted
by law provided that Agent delivers copies thereof to the applicable Grantor(s)
substantially contemporaneously with such filing. A carbon, photographic or
other reproduction of this Agreement or any financing statement covering the
Collateral or any part thereof shall be sufficient as a financing statement
where permitted by law.

              (d) With respect to any Collateral consisting of securities,
instruments, partnership or joint venture interests, limited liability company
interests, or the like, each Grantor hereby consents and agrees that, during the
existence of an Event of Default, the issuers of, or obligors on, any such
Collateral, or any registrar or transfer agent or trustee for any such
Collateral, shall be entitled to accept the provisions of this Agreement as
conclusive evidence of the right of Agent to effect any transfer or exercise any
right hereunder or with respect to any such Collateral subject to the terms
hereof, notwithstanding any other notice or direction to the contrary heretofore
or hereafter given by any Grantor or any other Person to such issuers or such
obligors or to any such registrar or transfer agent or trustee.

         5.   VOTING RIGHTS; DIVIDENDS; ETC. So long as no Event of Default
shall have occurred and be continuing:

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<PAGE>
              (a) Voting Rights. Each Grantor shall be entitled to exercise any
and all voting and other consensual rights pertaining to its Pledged Securities,
its Pledged Partnership Interests and its Pledged Limited Liability Company
Interests, or any part thereof, for any purpose not inconsistent with the terms
of this Agreement, the Reimbursement Agreement or the other Operative Documents;
provided, however, that each Grantor shall not exercise, or shall refrain from
exercising, any such right if it would result in an Event of Default.

              (b) Dividend and Distribution Rights. Subject to the terms of the
Reimbursement Agreement, each Grantor shall be entitled to receive and to retain
and use any and all dividends or distributions paid in respect of its Pledged
Securities, its Pledged Partnership Interests or its Pledged Limited Liability
Company Interests; provided, however, that any and all:

                   (i) non-cash dividends or distributions in the form of
capital stock, certificated limited liability company interests, instruments or
other property received, receivable or otherwise distributed in respect of, or
in exchange for, any Pledged Securities, Pledged Partnership Interests, Pledged
Limited Liability Company Interests,

                   (ii) dividends and other distributions paid or payable in
cash in respect of any Pledged Securities, Pledged Partnership Interests or
Pledged Limited Liability Company Interests in connection with a partial or
total liquidation or dissolution or in connection with a reduction of capital,
capital surplus or paid-in-surplus, and

                   (iii) cash paid, payable or otherwise distributed in
redemption of, or in exchange for, any Pledged Securities, Pledged Partnership
Interests or Pledged Limited Liability Company Interests,

shall, except as otherwise provided for in the Reimbursement Agreement or the
other Operative Documents, forthwith be delivered to Agent, in the case of (i)
above, to be held as Collateral and shall, if received by such Grantor, be
received in trust for the benefit of Agent, be segregated from the other
property of such Grantor and forthwith be delivered to Agent as Collateral in
the same form as so received (with any necessary endorsements), and in the case
of (ii) and (iii) above, to be applied to the Obligations to the extent
permitted by the Reimbursement Agreement or otherwise to be held as Collateral.

         6.   RIGHTS AS TO PLEDGED COLLATERAL DURING EVENT OF DEFAULT. When an
Event of Default has occurred and is continuing:

              (a)  Voting, Dividend and Distribution Rights. Upon notice from
Agent to the Grantors, all rights of each Grantor to exercise the voting and
other consensual rights which it would otherwise be entitled to exercise
pursuant to Section 5(a) above, and to receive the dividends and distributions
which it would otherwise be authorized to receive and retain pursuant to Section
5(b) above, shall cease, and all such rights shall thereupon become vested in
Agent who shall thereupon have the sole right to exercise such voting and other
consensual rights and to receive and to hold as Pledged Collateral such
dividends and distributions during the continuance of such Event of Default.

              (b) Dividends and Distributions Held in Trust. All dividends and
other distributions which are received by any Grantor contrary to the provisions
of Section 6(a) of this Agreement shall be received in trust for the benefit of
Agent, shall be segregated from other funds of such Grantor and forthwith shall
be paid over to Agent as Collateral in the same form as so received (with any
necessary endorsements).

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<PAGE>
         7.   IRREVOCABLE PROXY. Each Grantor hereby revokes all previous
proxies with regard to its Pledged Securities, its Pledged Partnership Interests
and its Pledged Limited Liability Company Interests and, appoints Agent as its
respective proxyholder to (a) attend and vote at any and all meetings of the
shareholders of the corporation(s) which issued the Pledged Securities, and any
adjournments thereof, held on or after the date of the giving of this proxy and
prior to the termination of this proxy and to execute any and all written
consents of shareholders of such corporation(s) executed on or after the date of
the giving of this proxy and prior to the termination of this proxy, with the
same effect as if such Grantor had personally attended the meetings or had
personally voted its shares or had personally signed the written consents,
waivers or ratification, and (b) to attend and vote at any and all meetings of
the members of the Pledged Entities or partners of the Pledged Partnership
Entities (whether or not such Pledged Limited Liability Company Interests or
Pledged Partnership Interests are transferred into the name of Agent), and any
adjournments thereof, held on or after the date of the giving of this proxy and
to execute any and all written consents, waivers and ratifications of the
Pledged Entities or Pledged Partnership Entities executed on or after the date
of the giving of this proxy and prior to the termination of this proxy with the
same effect as if such Grantor had personally attended the meetings or had
personally voted on their respective Limited Liability Company Interests or
Partnership Interests or had personally signed the consents, waivers or
ratifications; provided, however, that Agent as proxyholder shall have rights
hereunder only during the existence of an Event of Default. Each Grantor hereby
authorizes Agent to substitute another Person (which Person shall be a successor
to the rights of Agent hereunder, a nominee appointed by Agent to serve as
proxyholder, or otherwise as approved by such Grantor in writing, such approval
not to be unreasonably withheld) as the proxyholder and, during the existence of
any Event of Default, hereby authorizes and directs the proxyholder to file this
proxy and the substitution instrument with the secretary of the appropriate
corporation. This proxy is-coupled with an interest and is irrevocable until
such time as all Obligations have been indefeasibly paid in full.

         8.   THE GRANTORS' REPRESENTATIONS AND WARRANTIES. Each Grantor
represents and warrants as follows:

              (a) (i) The locations listed on the Schedule 1-A constitute all
locations at which Collateral owned by such Grantor is located; (ii) the chief
executive office of such Grantor, where such Grantor keeps its records
concerning the Collateral, is located at the address set forth for such Grantor
on Schedule 1-D; (iii) such Grantor has exclusive possession and control of the
Collateral owned by such Grantor and (iv) such Grantor has only the Deposit
Accounts and Investment Accounts listed on Schedule 1-B.

              (b)  Such Grantor currently conducts business only under its own
name and the trade names listed on Schedule 1-E. Neither such Grantor nor any
corporate predecessor has, during the preceding five years, been known as or
used any other corporate or fictitious name, except the names disclosed on
Schedule 1-E.

              (c)  Such Grantor is the legal and beneficial owner of the
Collateral owned by such Grantor free and clear of all Liens except for
Permitted Liens. Such Grantor has the power, authority and legal right to grant
the security interests in such Collateral purported to be granted hereby, and to
execute, deliver and perform this Agreement. The pledge of such Collateral
pursuant to this Agreement creates a valid first priority security interest in
such Collateral (except for any Permitted Liens).

              (d)  No consent of any Person, including, without limitation, any
partner in a partnership with respect to which such Grantor has pledged its
interests as a Pledged Partnership Interest or any member in a Pledged Entity,
is required for the pledge by such Grantor of the Collateral owned by such
Grantor other than consents required under the agreements described in the
Disclosure Schedule.

                                       -9-
<PAGE>
              (e)  Except as set forth on Schedule 1-C, the Pledged Securities
described on Schedule 1-C attached hereto constitute (i) all of the shares of
capital stock of any Person, other than a Regulated Entity, owned by such
Grantor and (ii) that percentage of the issued and outstanding shares of the
respective issuers thereof indicated on Schedule 1-C attached hereto, and there
is no other class of shares issued and outstanding of the respective issuers
thereof except as set forth on Schedule 1-C attached hereto. Except as set forth
in Schedule 1-C, the Pledged Partnership Interests described on Schedule 1-C
attached hereto constitute all of the partnerships or joint ventures other than
Regulated Entities in which each Grantor has an interest, and such Grantor's
percentage interest in each such partnership or joint venture is as set forth on
such Schedule 1-C attached hereto. Except as set forth in Schedule 1-C, the
Pledged Limited Liability Company Interests described on Schedule 1-C attached
hereto constitute all of the Limited Liability Company Interests other than in,
of or with respect to Regulated Entities of each Grantor and such Grantor's
percentage interest in each such Pledged Entity is as set forth on Schedule 1-C
attached hereto.

              (f)  No authorization, approval or other action by, and no notice
to or filing with, any governmental authority (other than such authorizations,
approvals and other actions as have already been taken and are in full force and
effect) is required (A) for the pledge of the Collateral or the grant of the
security interest in the Collateral by any of the Grantors hereby or for the
execution, delivery or performance of this Agreement by any of the Grantors, or
(B) for the exercise by Agent of the voting rights in the Pledged Securities,
the Pledged Partnership Interest or the Pledged Limited Liability Company
Interests or of any other rights or remedies in respect of the Collateral
hereunder except as may be required in connection with any disposition of
Collateral consisting of securities by laws affecting the offering and sale of
securities generally.

              (g)  DSL.net Communications, LLC is a Regulated Entity.

         9.   COPYRIGHTS.

              (a) Royalties. Each Grantor hereby agrees that the use by Agent of
the Copyrights as authorized hereunder in connection with Agent's exercise of
its rights and remedies hereunder shall be without any liability for royalties
or other related charges from Agent to Grantors.

              (b) Restrictions on Future Agreements. Subject to the terms hereof
and of the Reimbursement Agreement, each Grantor shall be permitted to manage,
license and administer its Copyrights in such manner as such Grantor in its
reasonable business judgment deems desirable, provided, however, that such
Grantor will not, without the Agent's prior written consent, such consent not to
be unreasonably withheld or delayed, (i) enter into any copyright license
agreements except license agreements entered into in the ordinary course of its
business consistent with past practices and containing such additional
provisions to protect Agent's interest hereunder as Agent may from time to time
reasonably request or (ii) take any action, or permit any action to be taken by
others, including, without limitation, licensees, or fail to take any action,
which would customarily be taken by a Person in the same business and in similar
circumstances as such Grantor, which could in any respect reasonably be expected
to have a Material Adverse Effect.

              (c) Duties of Grantors. Each Grantor shall have the duty to:

              In accordance with its standard commercial practices, (i)
prosecute diligently any copyright application included in the Copyrights, (ii)
place notices of copyright on all copyrightable property produced or owned by
such Grantor embodying the Copyrights and use diligent reasonable efforts to
have its licensees do the same and (iii) take all reasonable action necessary in
such Grantor's reasonable business judgment consistent with past practices to
preserve and maintain all of Grantor's rights in the Copyrights that are or

                                      -10-
<PAGE>
shall be necessary in the operation of Grantor's business, including, without
limitation, making timely filings for renewals and extensions of registered
Copyrights and diligently monitoring unauthorized use thereof. Any expenses
incurred in connection with the foregoing shall be borne by Grantors. Agent
shall have no duty with respect to the Copyrights other than to act lawfully and
without gross negligence or willful misconduct. Without limiting the generality
of the foregoing, Agent shall not be under any obligation to take any steps
necessary to preserve rights in the Copyrights against any other parties, but
Agent may do so at its option upon the occurrence and during the continuance of
an Event of Default, and all reasonable expenses incurred in connection
therewith shall be for the sole account of Grantors and shall be added to the
Obligations.

         10.  PATENTS AND MARKS.

              (a) Royalties. Each Grantor hereby agrees that any rights granted
hereunder to Agent with respect to Patents and Marks shall be applicable to all
jurisdictions in which such Grantor has the right to use such Patents and Marks,
from time to time, and without any liability for royalties or other related
charges from Agent to Grantors.

              (b) Restrictions on Future Agreements. Each Grantor will not,
except in accordance with its standard commercial practices, abandon any Patent
or Mark in which such Grantor now owns or hereafter acquires any rights or
interests if such abandonment could reasonably be expected to have a Material
Adverse Effect or enter into any agreement, including, without limitation, any
license agreement, which is inconsistent with such Grantor's obligations under
this Agreement, if such actions could reasonably be expected to have a Material
Adverse Effect. Each Grantor further agrees that it will not take any action, or
permit any action to be taken by others subject to its control, including
licensees, or fail to take any action which would customarily be taken by a
Person in the same business and in similar circumstances as such Grantor, which
could reasonably be expected to have a Material Adverse Effect.

              (c) Duties of Grantors. In accordance with its standard commercial
practices, each Grantor shall have the duty to (i) prosecute diligently any
patent application or trademark application pending as of the date hereof or
thereafter until the Obligations shall have been indefeasibly paid in full and
Agent has no obligation to make any Loans under the Reimbursement Agreement,
(ii) file and prosecute opposition and cancellation proceedings if the failure
to do so could reasonably be expected to have a Material Adverse Effect and
(iii) take all reasonable action necessary in such Grantor's reasonable business
judgment consistent with past practices to preserve and maintain all rights in
patent applications of the Patents and in applications for registrations of the
Marks unless the failure so to do could not reasonably be expected to have a
Material Adverse Effect. Any expenses incurred in connection with the foregoing
applications shall be borne by Grantors. Each Grantor shall not abandon any
right to file a Patent application or Mark application except in accordance with
its standard commercial practices if such abandonment could reasonably be
expected to have a Material Adverse Effect. Each Grantor shall give proper
statutory notice in connection with its use of each of the Marks to the extent
necessary for the protection of each of the Marks. Grantors shall notify the
Agent of any suits it commences to enforce the Patents and Marks and shall
provide Agent with copies of any documents reasonably requested by Agent
relating to such suits.

         11.  GRANTORS' COVENANTS. In addition to the other covenants and
agreements set forth herein and in the other Operative Documents, each Grantor
covenants and agrees as follows:

              (a) Such Grantor will pay, prior to delinquency, all taxes,
charges, Liens and assessments against the Collateral owned by it, except those
with respect to which the amount or validity is being contested in good faith by
appropriate proceedings and with respect to which reserves in conformity with
GAAP have been provided on the books of such Grantor and except those which
could not reasonably be expected to have a Material Adverse Effect.

                                      -11-
<PAGE>
              (b) The Collateral owned by it will not be used in violation of
any material law, regulation or ordinance or any applicable laws (including
without limitation, all applicable regulations, rules and orders), nor used in
any way that will void or impair any insurance required to be carried in
connection therewith.

              (c) Such Grantor will keep the tangible Collateral owned by it in
reasonably good repair, working order and operating condition (normal wear and
tear excluded), and from time to time make all necessary and proper repairs,
renewals, replacements, additions and improvements thereto and, as appropriate
and applicable, will otherwise deal with the Collateral in all such ways as are
considered customary practice by owners of like property.

              (d) Such Grantor will take all reasonable steps to preserve and
protect the Collateral owned by it except where the failure to do so could not
reasonably be expected to have a Material Adverse Effect.

              (e) Such Grantor will maintain all insurance coverage required
pursuant to the terms of the Reimbursement Agreement.

              (f) Such Grantor will promptly notify Agent in writing in the
event of any material damage to the Collateral from owned by it any source
whatsoever which could reasonably be expected to have a Material Adverse Effect.

              (g) Such Grantor will not (i), except for equipment located at
such Grantor's customer's premises in the ordinary course of business, establish
any location of Collateral owned by it not listed in Schedule 1-A, (ii) move its
principal place of business, chief executive offices or any other office listed
in Schedule 1-D , (iii) change its jurisdiction of incorporation or
organization, or (iv) adopt, use or conduct business under any trade name or
other corporate or fictitious name not disclosed in Schedule 1-E, except upon
not less than 30 days prior written notice to Agent and such Grantor's prior
compliance with all applicable requirements of Section 4 hereof necessary to
perfect Agent's security interest hereunder.

              (h) Such Grantor shall cause all of its equipment constituting
Collateral owned by it to be operated and maintained in accordance with any
applicable manufacturer's manuals or instructions and the requirements of its
insurance policies. Such Grantor, at its expense, shall maintain such equipment
in good condition, reasonable wear and tear excepted, and will comply with all
laws, ordinances and regulations to which the use and operation of such
equipment may be or become subject. Such obligation shall extend to repair and
replacement of any partial loss or damage to such equipment, regardless of the
cause. All parts furnished in connection with such maintenance or repair shall
immediately become part of such equipment. All such maintenance, repair and
replacement services shall be promptly paid for and discharged by such Grantor
with the result that no lien will attach to such equipment. Only qualified
personnel of such Grantor or qualified contract personnel shall operate such
equipment. Such equipment shall be used only for the purposes for which it was
designed.

              (i) Such Grantor shall not establish any additional Deposit
Account not listed on Schedule 1-B, or any Investment Account not listed on
Schedule 1-B, except upon prior written notice to Agent and such Grantor's
compliance with all applicable requirements of Section 4 hereof necessary to
perfect Agent's security interest hereunder. With respect to account number
9428391015 (the "Disbursement Account") maintained at Lender, the Grantors agree

                                      -12-
<PAGE>
that they shall not deposit or transfer cash or other assets into such
Disbursement Account, or permit any cash or other asset to be deposited or
transferred into such Disbursement Account, or maintain a positive balance in
such Disbursement Account, except that cash may be transferred from other
accounts at Lender into such Disbursement Account for the sole purpose of
clearing outstanding checks issued from such Disbursement Account in the
ordinary course of business.

         12.  AGENT'S RIGHTS REGARDING COLLATERAL. At any time and from time to
time, Agent may, to the extent necessary or desirable to protect the security
hereunder, but Agent shall not be obligated to: (a) (whether or not an Event of
Default has occurred) itself or through its representatives, at its own expense,
upon reasonable prior notice and at such reasonable times during usual business
hours, visit and inspect any of the Grantors' properties and examine and make
abstracts from any of its books and records at any reasonable time and as often
as may reasonably be desired and discuss the business, operations, properties
and financial and other condition of any of the Grantors with officers of such
Grantors and with their accountants or (b) if an Event of Default has occurred
and is continuing, at the expense of the Grantors, perform any obligation of any
of the Grantors under this Agreement. At any time and from time to time, at the
expense of the Grantors, Agent may, to the extent necessary or desirable to
protect the security hereunder, but Agent shall not be obligated to: (i) notify
obligors of the Collateral that the Collateral has been pledged as security to
Agent; (ii) after an Event of Default has occurred and is continuing, at any
time and from time to time request from obligors of the Collateral, in the name
of the applicable Grantor or in the name of Agent, information concerning the
Collateral and the amounts owing thereon; and (iii) after an Event of Default
has occurred and is continuing, direct obligors under the contracts included in
the Collateral to direct their performance to Agent. Each Grantor shall keep
proper books and records and accounts in which full, true and correct entries in
conformity with GAAP and all applicable laws (including without limitation, all
applicable regulations, rules and orders) shall be made of all material dealings
and transactions pertaining to the Collateral owned by it. Agent shall at all
reasonable times on reasonable prior notice have full access to and the right to
audit any and all of Grantors' books and records pertaining to the Collateral,
and to confirm and verify the value of the Collateral. Agent shall not be under
any duty or obligation whatsoever to take any action to preserve any rights of
or against any prior or other parties in connection with the Collateral, to
exercise any voting rights or managerial rights with respect to any Collateral
or to make or give any presentments for payment, demands for performance,
notices of non-performance, protests, notices of protest, notices of dishonor or
notices of any other nature whatsoever in connection with the Collateral or the
Obligations. Agent shall not be under any duty or obligation whatsoever to take
any action to protect or preserve the Collateral or any rights of the Grantors'
therein, or to make collections or enforce payment thereon, or to participate in
any foreclosure or other proceeding in connection therewith. Nothing contained
herein or in any consent shall constitute an assumption by Agent of any of the
Grantors' obligations under the contracts assigned hereunder unless Agent shall
have given written notice to the counterpart to such assigned contract of
Agent's intention to assume such contract. Each Grantor shall continue to be
liable for performance of its obligations under such contracts.

         13.  COLLECTIONS ON THE COLLATERAL. Except as provided to the contrary
in the Reimbursement Agreement, each Grantor shall have the right to use and to
continue to make collections on and receive dividends and other proceeds of all
of the Collateral in the ordinary course of business so long as no Event of
Default shall have occurred and be continuing. Upon the occurrence and during
the continuance of an Event of Default, upon notice from Agent to the Grantors,
each Grantor's right to make collections on and receive dividends and other
proceeds of the Collateral owned by it and to use or dispose of such collections
and proceeds shall terminate, and any and all dividends, proceeds and
collections, including all partial or total prepayments, then held or thereafter
received on or on account of the Collateral will be held or received by such
Grantor in trust for Agent and promptly delivered in kind to Agent (duly
endorsed to Agent, if required), to be applied to the obligations or held as
Collateral, as Agent shall elect. During the existence of an Event of Default,
Agent shall have the right at all times to receive, receipt for, endorse,

                                      -13-
<PAGE>
assign, deposit and deliver, in the name of any of the Grantors, any and all
checks, notes, drafts and other instruments for the payment of money
constituting proceeds of or otherwise relating to the Collateral; and each
Grantor hereby authorizes Agent to affix, by facsimile signature or otherwise,
the general or special endorsement of such Grantor, in such manner as Agent
shall deem advisable, to any such instrument in the event the same has been
delivered to or obtained by Agent without appropriate endorsement, and Agent and
any collecting bank are hereby authorized to consider such endorsement to be a
sufficient, valid and effective endorsement by such Grantor, to the same extent
as though it were manually executed by the duly authorized representative of
such Grantor, regardless of by whom or under what circumstances or by what
authority such endorsement actually is affixed, without duty of inquiry or
responsibility as to such matters, and such Grantor hereby expressly waives
demand, presentment, protest and notice of protest or dishonor and all other
notices of every kind and nature with respect to any such instrument.

         14.  POSSESSION OF COLLATERAL BY AGENT. All the Collateral now,
heretofore or hereafter delivered to Agent shall be held by Agent in its
possession, custody and control. During the existence of an Event of Default,
whenever any of the Collateral is in Agent's possession, custody or control,
Agent may use, operate and consume the Collateral, whether for the purpose of
preserving and/or protecting the Collateral, or for the purpose of performing
any of the Grantors' obligations with respect thereto, or otherwise so long as
consistent with the Operative Documents or transactions contemplated thereby.
Agent may at any time deliver or redeliver the Collateral or any part thereof to
the Grantors, and the receipt of any of the same by the Grantors shall be
complete and full acquittance for the Collateral so delivered, and Agent
thereafter shall be discharged from any liability or responsibility arising
after such delivery to the Grantors. So long as Agent exercises reasonable care
and complies with Section 9207 of the UCC with respect to any Collateral in its
possession, custody or control, Agent shall have no liability for any loss of or
damage to any Collateral, and in no event shall Agent have liability for any
diminution in value of Collateral occasioned by economic or market conditions or
events.

         15.  REMEDIES.

              (a)  Rights During Event of Default. During the existence of an
Event of Default, the Grantors shall be in default hereunder and, subject to
applicable law, Agent, shall have, in any jurisdiction where enforcement is
sought, in addition to all other rights and remedies that Agent may have under
this Agreement and under applicable laws or in equity, all rights and remedies
of a secured party under the Uniform Commercial Code as enacted in any such
jurisdiction in effect at that time, and in addition the following rights and
remedies in accordance with applicable law, all of which may be exercised at the
direction of Required Guarantors (provided, that if the Columbia Entities desire
to take an enforcement action that Required Guarantors have not consented to,
the Agent shall take such enforcement action as the Columbia Entities direct the
Agent to take, provided further, that Agent shall not take such enforcement
action until the earlier of (A) the 120th day after receipt by Agent of written
notice of such enforcement action from the Columbia Entities or (B) such time as
the Required Guarantors have provided their consent to such enforcement
actions), with or without further prior notice to the Grantors except such
notice as may be specifically required by applicable law: (i) to foreclose the
Liens and security interests created hereunder or under any other Operative
Document by any available judicial procedure or without judicial process; (ii)
to enter peaceably any premises where any Collateral may be located for the
purpose of securing, protecting, inventorying, appraising, inspecting,
repairing, preserving, storing, preparing, processing, taking possession of or
removing the same; (iii) to sell, assign, lease or otherwise dispose of any
Collateral or any part thereof, either at public or private sale or at any
broker's board, in lot or in bulk, for cash, on credit or otherwise, with or
without representations or warranties and upon such terms as shall be
commercially reasonable; (iv) to notify obligors on the Collateral that the
Collateral has been assigned to Agent and that all payments thereon, or
performance with respect thereto, are to be made directly and exclusively to
Agent; (v) to collect by legal proceedings or otherwise all dividends,

                                      -14-
<PAGE>
distributions, interest, principal or other sums now or hereafter payable upon
or on account of the Collateral; (vi) to enter into any extension,
reorganization, disposition, merger or consolidation agreement, or any other
agreement relating to or affecting the Collateral, and in connection therewith
Agent may deposit or surrender control of the Collateral and/or accept other
property in exchange for the Collateral as Agent reasonably deems appropriate
and is commercially reasonable; (vii) to settle, compromise or release, on terms
acceptable to Agent, in whole or in part, any amounts owing on the Collateral
and/or any disputes with respect thereto; (viii) to extend the time of payment,
make allowances and adjustments and issue credits in connection with the
Collateral in the name of the applicable Grantor for the benefit of Agent; (ix)
to enforce payment and prosecute any action or proceeding with respect to any or
all of the Collateral and take or bring, on behalf of itself or in the name of
the applicable Grantor, any and all steps, actions, suits or proceedings deemed
necessary or reasonably desirable by Agent to effect collection of or to realize
upon the Collateral, including any judicial or nonjudicial foreclosure thereof
or thereon, and each Grantor specifically consents to any nonjudicial
foreclosure of any or all of the Collateral or any other action taken by Agent
which may release any obligor from personal liability on any of the Collateral,
and each Grantor waives, to the extent permitted by applicable law, any right to
receive prior notice of any public or private judicial or nonjudicial sale or
foreclosure of any security or any of the Collateral, and any money or other
property received by Agent in exchange for or on account of the Collateral,
whether representing collections or proceeds of Collateral, and whether
resulting from voluntary payments or foreclosure proceedings or other legal
action taken by Agent or any of the Grantors, may be applied by Agent, without
notice to the Grantors, to the Obligations in such order and manner as Agent in
its sole discretion shall determine; (x) to insure, protect and preserve the
Collateral; (xi) to exercise all rights, remedies, powers or privileges provided
under any of the Operative Documents; and (xii) to remove peaceably, from any
premises where the same may be located, the Collateral and any and all
documents, instruments, files and records, and any receptacles and cabinets
containing the same, relating to the Collateral, and Agent may, at the cost and
expense of the Grantors and subject to the rights of third parties, use such of
its supplies, equipment, facilities and space at its places of business as may
be necessary or appropriate to properly administer, process, store, control,
prepare for sale or disposition and/or sell or dispose of the Collateral or to
properly administer and control the handling of collections and realizations
thereon, and, subject to the rights of third parties, Agent shall be deemed to
have a rent-free tenancy of any premises of the Grantors for such purposes and
for such periods of time as reasonably required by Agent. So long as an Event of
Default has occurred and is continuing, each Grantor will, at Agent's request,
assemble the Collateral and make it available to Agent at places which Agent may
designate, whether at the premises of such Grantor or elsewhere, which are
reasonably convenient to Agent and the Grantors and will make available to
Agent, free of cost and subject to the rights of third parties, all premises,
equipment and facilities of such Grantor for the purpose of Agent's taking
possession of the Collateral or storing the same or removing or putting the
Collateral in salable form or selling or disposing of the same.

              (b) Possession by Agent. During the existence of an Event of
Default, Agent also shall have the right, without prior notice or demand, either
in person, by Agent or by a receiver to be appointed by a court in accordance
with the provisions of applicable law (and each Grantor hereby expressly
consents, to the fullest extent permitted by applicable law, during the
existence of an Event of Default to the appointment of such a receiver), and, to
the extent permitted by applicable law, without regard to the adequacy of any
security for the Obligations, to take possession of the Collateral or any part
thereof and to collect and receive the rents, issues, profits, income and
proceeds thereof. The taking possession of the Collateral by Agent shall not
cure or waive any Event of Default or notice thereof or invalidate any act done
pursuant to such notice. The rights, remedies and powers of any receiver
appointed by a court shall be as ordered by said court.

              (c) Sale of Collateral. Any public or private sale or other
disposition of the Collateral pursuant to this Section 15 may be held, subject
to the rights of third parties, at any office of Agent, or at the Grantors'

                                      -15-
<PAGE>
places of business, or at any other place permitted by applicable law, and
without the necessity of the Collateral being within the view of prospective
purchasers. Agent may direct the order and manner of sale of the Collateral, or
portions thereof, as it in its sole and absolute discretion may determine
provided such sale is commercially reasonable, and each Grantor expressly
waives, to the extent permitted by applicable law, any right to direct the order
and manner of sale of any Collateral. Agent or any Person acting on Agent's
behalf may bid and purchase at any such sale or other disposition. In
furtherance of Agent's rights hereunder, each Grantor hereby grants to Agent an
irrevocable, non-exclusive license (exercisable without royalty or other payment
by Agent) to use, license or sublicense any patent, trademark, trade name,
copyright or other intellectual property in which Grantor now or hereafter has
any right, title or interest together with the right of access to all media in
which any of the foregoing may be recorded or stored; provided, however, that
such license shall only be exercisable in connection with the disposition of
Collateral upon Agent's exercise of its remedies hereunder.

              (d) Notice of Sale. Unless the Collateral is perishable or
threatens to decline speedily in value or is of a type customarily sold on a
recognized market, Agent will give the Grantors reasonable notice of the time
and place of any public sale thereof or of the time on or after which any
private sale thereof is to be made. The requirement of reasonable notice
conclusively shall be met if such notice is mailed, certified mail, postage
prepaid, to the Grantors at their addresses set forth on the signature page
hereto or delivered or otherwise sent to the Grantors, at least seven (7)
Business Days before the date of the sale. Each Grantor expressly waives, to the
fullest extent permitted by applicable law, any right to receive notice of any
public or private sale of any Collateral or other security for the Obligations
except as expressly provided for in this paragraph. Agent shall not be obligated
to make any sale of the Collateral if it shall determine not to do so regardless
of the fact that notice of sale of the Collateral may have been given. Agent
may, without notice or publication, except as required by applicable law,
adjourn the sale from time to time by announcement at the time and place fixed
for sale, and such sale may, without further notice (except as required by
applicable law), be made at the time and place to which the same was so
adjourned.

              (e) Private Sales. With respect to any Collateral consisting of
securities, partnership interests, limited liability company interests, joint
venture interests or the like, and whether or not any of such Collateral has
been effectively registered under the Securities Act of 1933, as amended, or
other applicable laws, Agent may, in its sole and absolute discretion, sell all
or any part of such Collateral at private sale pursuant to this Section 15 in
such manner and under such circumstances as Agent may deem necessary or
advisable in order that the sale may be lawfully conducted in a commercially
reasonable manner. Without limiting the foregoing, Agent may (i) approach and
negotiate with a limited number of potential purchasers, and (ii) restrict the
prospective bidders or purchasers to persons who will represent and agree that
they are purchasing such Collateral for their own account for investment and not
with a view to the distribution or resale thereof. In the event that any such
Collateral is sold at private sale pursuant to this Section 15, each Grantor
agrees to the extent permitted by applicable law that if such Collateral is sold
for a price which is commercially reasonable, then (A) the Grantors shall not be
entitled to a credit against the Obligations in an amount in excess of the
purchase price, and (B) Agent shall not incur any liability or responsibility to
the Grantors in connection therewith, notwithstanding the possibility that a
substantially higher price might have been realized at a public sale. Each
Grantor recognizes that a ready market may not exist for such Collateral if it
is not regularly traded on a recognized securities exchange, and that a sale by
Agent of any such Collateral for an amount substantially less than a pro rata
share of the fair market value of the issuer's assets minus liabilities may be
commercially reasonable in view of the difficulties that may be encountered in
attempting to sell a large amount of such Collateral or Collateral that is
privately traded.

              (f) Title of Purchasers. Upon consummation of any sale of
Collateral hereunder, Agent shall have the right to assign, transfer and deliver
to the purchaser or purchasers thereof the Collateral so sold. Each such

                                      -16-
<PAGE>
purchaser at any such sale shall hold the Collateral so sold absolutely free
from any claim or right upon the part of any Grantor or any other Person
claiming through any Grantor, and each Grantor hereby waives (to the extent
permitted by applicable laws) all rights of redemption, stay and appraisal which
it now has or may at any time in the future have under any rule of law or
statute now existing or hereafter enacted. If the sale of all or any part of the
Collateral hereunder is made on credit or for future delivery, Agent shall not
be required to apply any portion of the sale price to the Obligations until such
amount actually is received by Agent, and any Collateral so sold may be retained
by Agent until the sale price is paid in full by the purchaser or purchasers
thereof. Agent shall not incur any liability in case any such purchaser or
purchasers shall fail to pay for the Collateral so sold, and, in case of any
such failure, the Collateral may be sold again.

              (g) Disposition of Proceeds of Sale. The proceeds resulting from
the collection, liquidation, sale or other disposition of the Collateral
hereunder shall be applied, first, to the reasonable costs and expenses
(including reasonable attorneys' fees) of retaking, holding, storing, processing
and preparing for sale, selling, collecting and liquidating the Collateral, and
the like; second, to the satisfaction of all Obligations; and third, any surplus
remaining after the satisfaction of all Obligations, to be paid over to the
Grantors or to whomsoever may be lawfully entitled to receive such surplus.

              (h) Certain Waivers. To the extent permitted by applicable law,
each Grantor waives all claims, damages and demands against Agent arising out of
the repossession, retention or sale of the Collateral, or any part or parts
thereof hereunder, except to the extent any such claims, damages and awards
arise out of the gross negligence or willful misconduct of Agent.

              (i) Remedies Cumulative. The rights and remedies provided under
this Agreement are cumulative and may be exercised singly or concurrently, and
are not exclusive of any other rights and remedies provided by law or equity.

              (j) Account Control Agreements. With respect to any account
control agreements or other similar agreements entered into by Agent, any
Guarantor and any financial institution to perfect Agent's security interest in
deposit or investment accounts held at such financial institution, Agent agrees
that it shall only cause such financial institution to agree to comply, without
further consent of Borrower, with entitlement orders, notices of exclusive
control or other instructions from Agent to such financial institution as to
such deposit or investment accounts during the existence of an Event of Default.
Agent agrees to provide Borrower with a copy of any notices of exclusive control
or other similar notices.

         16.  NOTICE. Agent shall use reasonable efforts to give the Grantors
reasonable prior written notice of the exercise of any remedy provided for
herein, provided that the failure to give such notice shall not subject Agent to
liability and shall not affect the validity or exercise of any remedy hereunder.

         17.  AGENT APPOINTED ATTORNEY-IN-FACT. To the full extent permitted by
applicable law, each Grantor hereby irrevocably appoints Agent as such Grantor's
attorney-in-fact, with full authority in the place and stead of such Grantor,
and in the name of such Grantor, or otherwise, from time to time, in Agent's
sole and absolute discretion to do any of the following acts or things during
the existence of an Event of Default: (a) to do all acts and things and to
execute all documents necessary or advisable to perfect and continue perfected
the security interests created by this Agreement and to preserve, maintain and
protect the Collateral; (b) to do any and every act which such Grantor is
obligated to do under this Agreement; (c) to prepare, sign, file and record, in
such Grantor's name, any financing statement covering the Collateral; (d) to
endorse and transfer the Collateral upon foreclosure by Agent; and (e) to file
any claims or take any action or institute any proceedings which Agent may
reasonably deem necessary or desirable for the protection or enforcement of any
of the rights of Agent with respect to any of the Collateral; provided, however,
that Agent shall be under no obligation whatsoever to take any of the foregoing
actions, and Agent shall have no liability or responsibility for any act or
omission (other than Agent's own gross negligence or willful misconduct) taken
with respect thereto.

                                      -17-
<PAGE>
         18.  COSTS AND EXPENSES. Each Grantor shall pay on demand (i) all
reasonable fees and expenses, including reasonable attorneys' fees and expenses,
incurred by Agent in connection with the preparation, execution and delivery of,
and the exercise of its duties under, this Agreement and the preparation,
execution and delivery of amendments and waivers hereunder and (ii) all
reasonable fees and expenses, including reasonable attorneys' fees and expenses,
incurred by Agent in connection with the enforcement or attempted enforcement of
this Agreement or any of the Obligations or in preserving any of Agent's rights
and remedies (including, without limitation, all such fees and expenses incurred
in connection with any "workout" or restructuring affecting the Operative
Documents or the Obligations or any bankruptcy or similar proceeding involving
such Grantor, any other Grantor, Borrower or any of their Affiliates).

         19.  INTENTIONALLY OMITTED.

         20.  OTHER AGREEMENTS; GOVERNING AGREEMENT. Nothing herein shall in any
way modify or limit the effect of terms or conditions set forth in any other
Operative Document executed by the Grantors or any other Person in connection
with the Obligations, but each and every term and condition hereof shall be in
addition thereto; provided, however, that in the event of inconsistency between
this Agreement and the Reimbursement Agreement, the Reimbursement Agreement
shall govern.

         21.  COUNTERPARTS. This Agreement may be executed in any number of
counterparts and by different parties hereto in separate counterparts, each of
which shall be deemed to be an original, but all of which taken together shall
constitute one and the same agreement.

         22.  UNDERSTANDINGS WITH RESPECT TO WAIVERS AND CONSENTS. Each Grantor
warrants and agrees that each of the waivers and consents set forth herein are
made with full knowledge of their significance and consequences, with the
understanding that events giving rise to any defense or right waived may
diminish, destroy or otherwise adversely affect rights which such Grantor
otherwise may have against Agent or others, or against any Collateral. If any of
the waivers or consents herein are determined to be unenforceable under
applicable law, such waivers and consents shall be effective to the maximum
extent permitted by law.

         23.  INDEMNITY. Each Grantor shall indemnify, reimburse and hold Agent,
each of Agent's members, and each of their respective successors, assigns,
agents, officers, directors, shareholders, servants, agents and employees
harmless from and against all liabilities, losses, damages, actions, suits,
demands, claims of any kind and nature (including claims relating to
environmental discharge, cleanup or compliance), all costs and expenses
whatsoever to the extent they may be incurred or suffered by such indemnified
party in connection therewith (including reasonable attorneys' fees and
expenses), fines, penalties (and other charges of applicable governmental
authorities), licensing fees relating to any item of Collateral, damage to or
loss of use of property (including consequential or special damages to third
parties or damages to Borrower's property), or bodily injury to or death of any
person (including any agent or employee of Borrower) (each, a "CLAIM" and
collectively, the "CLAIMS"), directly or indirectly relating to or arising out
of the use of the proceeds of the Loan or otherwise, the falsity of any
representation or warranty of such Grantor or such Grantor's failure to comply
with the terms of this Agreement or any other Operative Document while the
Obligations are outstanding. The foregoing indemnity shall cover, without
limitation, (i) any Claim in connection with a design or other defect (latent or
patent) in any item of equipment included in the Collateral, (ii) any Claim for
infringement of any patent, copyright, trademark or other intellectual property
right, (iii) any Claim resulting from the presence on or under or the escape,
seepage, leakage, spillage, discharge, emission or release of any hazardous
materials on the premises of such Grantor, including any Claims asserted or

                                      -18-
<PAGE>
arising under any environmental law, or (iv) any Claim for negligence or strict
or absolute liability in tort; provided, however, that such Grantor shall not
indemnify Agent for any liability incurred by Agent as a direct and sole result
of Agent's gross negligence or willful misconduct. Such indemnities shall
continue in full force and effect, notwithstanding the expiration or termination
of this Agreement. Upon an indemnitee's written demand, such Grantor shall
assume and diligently conduct, at its sole cost and expense, the entire defense
of Agent, each of its members, and each of their respective agents, employees,
directors, officers, shareholders, successors and assigns, using counsel
reasonably acceptable to such indemnitee against any indemnified Claim. Such
Grantor shall not settle or compromise any Claim against or involving Agent
without first obtaining Agent's written consent thereto, which consent shall not
be unreasonably withheld or delayed.

         24.  AMENDMENTS, ETC. No amendment or waiver of any provision of this
Agreement nor consent to any departure by the Grantors herefrom (other than
supplements to the Schedules hereto in accordance with the terms of this
Agreement) shall in any event be effective unless the same shall be in writing
and made in accordance with the terms of the Reimbursement Agreement, and then
such waiver or consent shall be effective only in the specific instance and for
the specific purpose for which given.

         25.  NOTICES. All notices and other communications provided for
hereunder shall be given in writing in the manner and to the addresses set forth
either in the Reimbursement Agreement or in the Guaranty dated as of even date
herewith made by the Grantors.

         26.  CONTINUING SECURITY INTEREST: TRANSFER OF NOTES; TERMINATION. This
Agreement shall create a continuing security interest in the Collateral pursuant
to Section 2 hereof and shall (i) remain in full force and effect until (A)
indefeasible payment in full of the Obligations and the termination or
expiration of Lender's obligation to make loans under the Credit Agreement or
(B) the termination of the Guarantors' obligations under the Credit Guaranties,
(ii) be binding upon each Grantor, their successors and assigns and (iii) inure,
together with the rights and remedies of Agent and the Guarantors hereunder, to
the benefit of Agent and the Guarantors and any successors hereof, subject to
the terms and conditions of the Reimbursement Agreement. Subject to the terms of
the Reimbursement Agreement, any Guarantor may assign or otherwise transfer its
rights thereof, or any rights in Collateral held by it to any other Person, and
such other Person shall thereupon become vested with all the benefits in respect
thereof granted to such Guarantor or Agent herein or otherwise. Nothing set
forth herein or in any other Operative Document is intended or shall be
construed to give to any other party any right, remedy or claim under, to or in
respect of this Agreement or any other Operative Document or any Collateral. The
Grantors' successors and assigns shall include, without limitation, a receiver,
trustee or debtor-in-possession thereof or therefor, provided that, except as
otherwise permitted under the Reimbursement Agreement or any other Operative
Document, none of the rights or obligations of the Grantors hereunder may be
assigned or otherwise transferred without the prior written consent of Agent.

         27.  RELEASE OF THE GRANTORS. This Agreement and all obligations of
each Grantor hereunder and all security interests granted hereby shall be
released and terminated when all Obligations have been paid in full in cash and
when Lender's obligation to make loans under the Credit Agreement has expired or
have otherwise been terminated, or when the Guarantors' obligations under the
Credit Guaranties shall have otherwise been terminated. Upon such release and
termination of all Obligations and the security interest hereunder, all rights
in and to the Collateral granted or pledged by the Grantors hereunder shall
automatically revert to the Grantors, and Agent shall return any pledged
Collateral in its possession to the Grantors, or to the Person or Persons
legally entitled thereto, and shall endorse, execute, deliver, record and file
all instruments and documents, and do all other acts and things, reasonably
required for the return of the Collateral to the Grantors, or to the Person or
Persons legally entitled thereto, and to evidence or document the release of the
interests of Agent arising under this Agreement, all as reasonably requested by,
and at the sole expense of, the Grantors.

                                      -19-
<PAGE>
         28.  GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF CALIFORNIA (WITHOUT REFERENCE TO ITS
CHOICE OF LAW PROVISIONS), EXCEPT AS OTHERWISE REQUIRED BY MANDATORY PROVISIONS
OF LAW AND EXCEPT TO THE EXTENT THAT REMEDIES PROVIDED BY THE LAWS OF A
JURISDICTION OTHER THAN THE STATE OF CALIFORNIA ARE GOVERNED BY THE LAWS OF SUCH
JURISDICTION.

         29.  JURY TRIAL. EACH GRANTOR, EACH GUARANTOR AND AGENT, TO THE FULLEST
EXTENT PERMITTED BY APPLICABLE LAW, HEREBY IRREVOCABLY WAIVES ALL RIGHT TO TRIAL
BY JURY AS TO ANY ISSUE RELATING HERETO IN ANY ACTION, PROCEEDING, OR
COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS AGREEMENT.

         30.  LIMITATION OF LIABILITY. NO CLAIM MAY BE MADE BY ANY GRANTOR
AGAINST ANY GUARANTOR OR AGENT OR THE MEMBERS, AFFILIATES, DIRECTORS, OFFICERS,
EMPLOYEES, OR ATTORNEYS OF ANY GUARANTOR OR AGENT FOR ANY SPECIAL, INDIRECT,
CONSEQUENTIAL OR PUNITIVE DAMAGES IN RESPECT OF ANY CLAIM (WHETHER BASED UPON
ANY BREACH OF CONTRACT, TORT, BREACH OF STATUTORY DUTY OR ANY OTHER THEORY OF
LIABILITY) ARISING OUT OF OR RELATED TO THE TRANSACTIONS CONTEMPLATED BY THIS
AGREEMENT, OR ANY ACT, OMISSION OR EVENT OCCURRING IN CONNECTION THEREWITH AND
EACH GRANTOR HEREBY WAIVES, RELEASES AND AGREES NOT TO SUE UPON ANY CLAIM FOR
ANY SUCH DAMAGES, WHETHER OR NOT NOW ACCRUED AND WHETHER OR NOT KNOWN OR
SUSPECTED TO EXIST IN ITS FAVOR.

         31.  COVENANT NOT TO ISSUE UNCERTIFICATED SECURITIES. Each Grantor
covenants to Agent that any Pledged Securities held by it shall be in
certificated form (as contemplated by Article 8 of the Uniform Commercial Code),
and that it will not seek to convert all or any part of any Pledged Securities
into uncertificated form (as contemplated by Article 8 of the Uniform Commercial
Code).

         32.  COVENANT NOT TO DILUTE INTERESTS OF AGENT IN SECURITIES. Each
Grantor represents, warrants and covenants to Agent that it will (a) not at any
time cause or permit any Subsidiary that is an issuer of Pledged Securities to
issue any capital stock or any warrant options or other rights to acquire any
capital stock, other than to such Grantor or as otherwise permitted under the
Reimbursement Agreement and (b) pledge to Agent in accordance with the terms
hereof, promptly upon its acquisition (directly or indirectly) thereof, and in
any event, within 5 days of such acquisition, any and all shares of stock or
other securities of each issuer of Pledged Securities.

         33.  PLEDGED LIMITED LIABILITY COMPANY INTERESTS/COVENANT NOT TO
DILUTE. Each Grantor represents, warrants and covenants to Agent that it will
(a) not at any time cause or permit any Pledged Entities to issue any additional
membership interests or any other rights or options to acquire any additional
limited liability company interests, other than to the Grantors or as otherwise
permitted under the Reimbursement Agreement, and (b) pledge to Agent in
accordance with the terms hereof, promptly upon its acquisition (directly or
indirectly) thereof, and in any event, within 5 days of such acquisition, any
and all additional Limited Liability Company Interests of each Pledged Entity.

         34.  PLEDGED PARTNERSHIP INTERESTS/COVENANT NOT TO DILUTE. Each Grantor
represents, warrants and covenants to Agent that it will (a) not at any time
cause or permit any Pledged Partnership Entities to issue any additional
partnership interests or any other rights or options to acquire any additional
partnership interests, other than to the Grantors or as otherwise permitted
under the Reimbursement Agreement, and (b) pledge to Agent in accordance with
the terms hereof, promptly upon its acquisition (directly or indirectly)
thereof, and in any event, within 5 days of such acquisition, any and all
additional Partnership Interests of each Pledged Partnership Entity.

                                      -20-
<PAGE>

         35.  CONFIDENTIALITY. All information (other than any periodic reports
filed by a Grantor with the Securities and Exchange Commission) disclosed by
Grantors to Agent in writing or through inspection pursuant to this Agreement
shall be considered confidential. Agent agrees to use the same degree of care to
safeguard and prevent disclosure of such confidential information as Agent uses
with its own confidential information, but in any event no less than a
reasonable degree of care. Agent shall not disclose such information to any
third party (other than Guarantors, or Agent's partners, or Agent's attorneys
and auditors subject to the same confidentiality obligation set forth herein)
and shall use such information primarily for purposes of evaluation of its
extension of credit to Grantors and the exercise of Agent's rights and the
enforcement of its remedies under this Agreement and the other Operative
Documents. The obligations of confidentiality shall not apply to any information
that (a) was known to the public prior to disclosure by any of the Grantors
under this Agreement, (b) becomes known to the public through no fault of Agent,
(c) is disclosed to Agent by a third party having a legal right to make such
disclosure, or (d) is independently developed by Agent.

                  [Remainder of page intentionally left blank]

                                      -21-
<PAGE>
         IN WITNESS WHEREOF, the parties hereto, by their officers thereunto
duly authorized, have executed this Agreement as of the day and year first above
written.

                                      DSL.NET, INC.

                                      By:    /s/ David F. Struwas
                                         ---------------------------------------
                                      Name:  David F. Struwas
                                           -------------------------------------
                                      Title: Chief Executive Officer
                                            ------------------------------------

                                      DSLNET COMMUNICATIONS PUERTO RICO, INC.

                                      By:    /s/ David F. Struwas
                                         ---------------------------------------
                                      Name:  David F. Struwas
                                           -------------------------------------
                                      Title: President
                                            ------------------------------------

                                      DSLNET COMMUNICATIONS VA, INC.

                                      By:    /s/ David F. Struwas
                                         ---------------------------------------
                                      Name:  David F. Struwas
                                           -------------------------------------
                                      Title: President
                                            ------------------------------------

                                      TYCHO NETWORKS, INC.

                                      By:    /s/ David F. Struwas
                                         ---------------------------------------
                                      Name:  David F. Struwas
                                           -------------------------------------
                                      Title: President
                                            ------------------------------------

                                      VECTOR INTERNET SERVICES, INC.

                                      By:    /s/ David F. Struwas
                                         ---------------------------------------
                                      Name:  David F. Struwas
                                           -------------------------------------
                                      Title: President
                                            ------------------------------------

ACCEPTED:

VANTAGEPOINT VENTURE PARTNERS III (Q), L.P., as Agent

By:   VantagePoint Venture Associates III, LLC

By: /s/ James D. Marver
   --------------------------------------
Name: James D. Marver
     ------------------------------------
Title: Managing Member

                    Signature Page to the Security Agreement
<PAGE>
                                  Schedule 1-A
                                  ------------
                             List of Asset Locations
                             -----------------------
                             Grantor: DSL.net, Inc.
                             ----------------------

<TABLE><CAPTION>
STREET                             CITY            STATE                       DESCRIPTION           TYPE OF ASSET
---------------------------------- --------------- -------------------------   --------------------- ---------------------------
<S>                                <C>             <C>                         <C>                   <C>
545 Long Wharf Drive               New Haven       CT                          Corporate Offices     Furniture & Fixtures;
                                                                                                     Network and Office
                                                                                                     Equipment; System Software
155 East Street                    New Haven       CT                          Warehouse             Network and Office
                                                                                                     Equipment
320-324 Encinal Street             Santa Cruz      CA                          Offices               Furniture & Fixtures
529 Bryant Street                  Palo Alto       CA                          Core Site             Network Equipment
55 S Market Street                 San Jose        CA                          Core Site             Network Equipment
12 South 6th Street                Minneapolis     MN                          Offices               Furniture & Fixtures;
                                                                                                     Network and Office
                                                                                                     Equipment; System Software
180 East 5th Street                Saint Paul      MN                          Core Site             Network Equipment
25 Broadway                        New York        NY                          Core Site             Network Equipment
1808 Swift Drive, Suite B          Oak Brook       IL                          Core Site             Network Equipment
101 North Plains Industrial Rd     Wallingford     CT                          Warehouse             Network Equipment
7990 Sience Applications Blvd      Vienna          VA                          Core Site             Network Equipment

251 Collocation Sites              Various         IL, IN, MI, CT, MA, NH,     Collocation sites     Network Equipment
                                                   NY, RI, VT, MD, NJ, PA,
                                                   VA, AL, FL, GA, LA, NC,
                                                   TN, CA

Collocation Fees                   Various         IL, IN, MI, CT, MA, NH,     Collocation Sites     CO Start Up Costs
                                                   NY, RI, VT, MD, NJ, PA,
                                                   VA, AL, FL, GA, LA, NC,
                                                   TN, CA

Customer CPE                       Various         Various                     Customer Locations    CPE

Vehicles                           New Haven       CT                          New Haven Offices     Vehicles
Leasehold Improvements             New Haven       CT                          New Haven Offices     Leasehold Improvements

</TABLE>

Customer premise equipment and network equipment may be located at staging areas
(either Company's or vendor's) prior to deployment. Spare parts may also be
located at such staging areas.

Grantor may obtain additional facilities, including corporate office, warehouse
or collocation sites, in connection with corporate or asset acquisitions.
<PAGE>
                                  Schedule 1-B
                            List of Deposit Accounts
                            ------------------------
<TABLE><CAPTION>
Grantor/Depositor's Name              Depositary Bank          Account Number        Account Type
------------------------              ---------------          --------------        ------------
<S>                                   <C>                      <C>                   <C>
DSL.net, Inc                          Fleet Bank               9407715973            checking
DSL.net, Inc                          Fleet Bank               9407948224            money market
DSL.net, Inc                          Fleet Bank               9411313643            money market
DSL.net, Inc                          People's Bank            116-6101704-09        money market
DSL.net, Inc                          Fleet Bank               8056278809            CD
DSL.net, Inc                          Fleet Bank               8056278796            CD
DSL.net, Inc                          Fleet Bank               8056278745            CD
DSL.net, Inc.                         Fleet Bank               9428391015            disbursement account
DSL.net, Inc                          Fidelity Investments     Plan 15255            money market
DSL.net, Inc                          Deutsche Banc            270-48400             money market
Vector Internet Services, Inc -       Associated Bank          2283002307            checking
dba Visi.com
</TABLE>

                             List of Restricted Cash
                             -----------------------
                   (collateral for various Letters of Credit)
                   ------------------------------------------
<TABLE><CAPTION>
Grantor/Depositor's Name              Depositary Bank          Account Number        Account Type
------------------------              ---------------          --------------        ------------
<S>                                   <C>                      <C>                   <C>
DSL.net, Inc                          People's Bank            116-8002240-09        CD
DSL.net, Inc                          People's Bank            116-8002238-08        CD
DSL.net, Inc                          People's Bank            116-8002123-08        CD
DSL.net, Inc                          People's Bank            001-8008541-08        CD
DSL.net, Inc                          People's Bank            116-8002178-00        CD
</TABLE>

         Bank Contacts:
         --------------
         Fleet Bank                                  Larry Minichiello
                                                     777 Main St, CT EH 40225 C
                                                     Hartford, CT 06115
                                                     (860) 952-7556

         People's Bank                               William McKernon
                                                     One Century Tower
                                                     265 Church St, Suite 104
                                                     New Haven, CT 06510-7013
                                                     (203) 785-9119

         Fidelity Investments                        401K forfeiture account
                                                     Plan # 15255
                                                     (888) 401-5238
<PAGE>

         Deutsche Banc Alex. Brown                   Greg Boag
                                                     11311 McCormick Road
                                                     Suite 230
                                                     Hunt Valley, MD 21031
                                                     (410) 229-2468

         Associated Bank                             Joe Bauer
                                                     800 LaSalle Ave
                                                     Minneapolis, MN 55402
                                                     (612) 338-8600

                           LIST OF SECURITIES ACCOUNTS
                           ---------------------------

Grantor/Depositor's Name    Depositary Bank    Account Number    Account Type
------------------------    ---------------    --------------    ------------
None

<PAGE>
<TABLE><CAPTION>
                                                       Schedule 1-C
                                                       ------------
                                                List of Pledged Collateral
                                                --------------------------

                                                             Shares or Interst       Shares Issued
Grantor              Issuer                     Cert. No.         Pledged           and Outstanding     Shares Authorized
-------              ------                     ---------         -------           ---------------     -----------------
<S>                  <C>                        <C>               <C>               <C>                 <C>
DSL.net, Inc.        DSLnet Communications          1               100                   100                 1,000
                     Puerto Rico, Inc.
DSL.net, Inc.        DSLnet Communications          1               100                   100                  100
                     VA, Inc.
DSL.net, Inc.        Tycho Networks, Inc.         CS-1             1,000                 1,000             20,000,000
DSL.net, Inc.        Vector Internet               20              1,000                 1,000              1,000,000
                     Services, Inc.

</TABLE>
<PAGE>
                                  Schedule 1-D
                                  ------------
               Location of Chief Executive Office of each Grantor
               --------------------------------------------------

Grantor                                                  Location
-------                                                  --------
All Grantors party to this Agreement                     545 Long Wharf Drive
                                                         5TH Floor
                                                         New Haven, CT  06511

<PAGE>
                                  Schedule 1-E
                                  ------------
                               List of Tradenames
                               ------------------

                                      Trade Names (including any
Grantor                               used in the preceding 5 years)
-------                               ------------------------------

DSL.net, Inc.                         DSL.net
DSL.net, Inc.                         Tycho
DSL.net, Inc.                         Tycho Networks
DSL.net, Inc.                         Trusted Net
Vector Internet Services, Inc.        VISI.com
Vector Internet Services, Inc.        VISI
Vector Internet Services, Inc.        Vector Internet Services, Inc.

We may also use tradenames of companies we acquire or whose assets we acquire on
or after the dates of acquisition.

<PAGE>
                                   Schdule 1-F
                                   -----------

Trademark                         Registration Number         Registration Date
---------                         -------------------         -----------------
DSL                               Tunisia EE98.1871           11/25/98
DSL.NET                           Supplemental-2,269,936      8/10/99
Vector Internet Services          2,262,761                   7/20/99
VISI.com (Stylized - the logo)    2,224,424                   2/16/99
VISI.com (the words)              2,234,325                   3/23/99

Tycho Networks                    Not Registered
NetGain                           Not Registered

Trademark Application                 Application Number       Application Date
---------------------                 ------------------       ----------------
NONE

<PAGE>
                                   Schdule 1-G
                                   -----------

Patent                            Registration Number          Registration Date
------                            -------------------          -----------------
NONE

Patent Application                Application Number           Application Date
------------------                ------------------           ----------------
NONE

<PAGE>
                                   Schdule 1-H
                                   -----------

Copyright                         Registration Number          Registration Date
---------                         -------------------          -----------------

We have declared copyrights to various materials prepared for or by the Company
such as software and marketing related items. None of these have been
registered.

Copyright Application             Application Number           Application Date
---------------------             ------------------           ----------------
NONE

<PAGE>
                                   Exhibit A-1
                                   -----------

                              To Security Agreement
                              ---------------------

                              FORM OF PLEDGE NOTICE
                              ---------------------

                             [Letterhead of Grantor]
                             -----------------------

                                                                          [Date]

TO:      [Name of Pledged Entity]

         Notice is hereby given that, pursuant to the Security Agreement (a true
and correct copy of which is attached hereto), dated as of ___________, 2002 (as
amended, modified or supplemented from time to time in accordance with the terms
thereof, the "Security Agreement"), among [NAME OF GRANTOR] (the "Grantor"), the
other pledgors from time to time party thereto and VantagePoint Venture Partners
III (Q), L.P., as administrative agent (the "Agent"), the Grantor has pledged
and assigned to the Agent, and granted to the Agent a continuing security
interest in, all right, title and interest of the Grantor, whether now existing
or hereafter arising or acquired, as a [[limited partner] [general partner]]
[member] in [NAME OF PLEDGED ENTITY] (the ["Partnership"] ["LLC"]), and in, to
and under the [TITLE OF APPLICABLE AGREEMENT] (the "[Partnership] [LLC]
Agreement"), including, without limitation:

              (i) all the capital of the [Partnership] [LLC] and the Grantor's
         interest in all profits, income, surplus, losses, [Partnership] [LLC]
         assets and other distributions to which the Grantor shall at any time
         be entitled in respect of such [Partnership] [Membership] interest;

              (ii) all other payments due or to become due to the Grantor in
         respect of such [partnership [limited liability company] interest,
         whether under the [Partnership] [LLC] Agreement or otherwise, whether
         as contractual obligations, damages, insurance proceeds or otherwise;

              (iii) all of its claims, rights, powers, privileges, authority,
         options, security interest, liens and remedies, if any, under the
         [Partnership] [LLC] Agreement or at law or otherwise in respect of
         such [Partnership] [Membership] Interest;

              (iv) all present and future claims, if any, of the Grantor
         against the [Partnership] [LLC] for moneys loaned or advanced, for
         services rendered or otherwise;

              (v) all of the Grantor's rights under the [Partnership] [LLC]
         Agreement or at law to exercise and enforce every right, power,
         remedy, authority, option and privilege of the Grantor relating to the
         [Partnership] [Membership] Interest, including any power to terminate,
         cancel or modify the [Partnership] [LLC] Agreement, to execute any
         instruments and to take any and all other action on behalf of and in
         the name of the Grantor in respect of the [Partnership] [Membership]
         Interest and the [Partnership] [LLC], to make determinations, to
         exercise any election (including, but not limited, election of
         remedies) or option or to give or receive any notice, consent,
<PAGE>

         amendment, waiver or approval, together with full power and authority
         to demand, receive, enforce, collect or receipt for any of the
         foregoing, to enforce or execute any checks, or other instruments or
         orders, to file any claims and to take any action in connection with
         any of the foregoing;

              (vi) all other property hereafter delivered in substitution for
         or in addition to any of the foregoing, all certificates and
         instruments representing or evidencing such other property and all
         cash, securities, interest, dividends, rights and other property at
         any time and from time to time received, receivable or otherwise
         distributed in respect of or in exchange for any or all thereof; and

              (vii) to the extent not otherwise included, all proceeds of any
         or all of the foregoing.

         Pursuant to the Security Agreement, the [Partnership] [LLC] is hereby
authorized and directed to register the Grantor's pledge to the Agent of the
interest of the Grantor on the [Partnership's] [LLC's] books.

         The Grantor hereby requests the [Partnership] [LLC] to indicate the
[Partnership's] [LLC's] acceptance of this Notice and consent to and
confirmation of its terms and provisions by signing a copy hereof where
indicated on the attached page and returning the same to the Agent.

                                         [NAME OF GRANTOR]

                                         By
                                            -----------------------------------
                                            Name:
                                            Title:
<PAGE>
                                   Exhibit A-2
                                   -----------
                              To Security Agreement
                              ---------------------
                          FORM OF ISSUER ACKNOWLEDGMENT
                          -----------------------------

         [NAME OF PLEDGED ENTITY] (the ["Partnership"] ["LLC"]) hereby
acknowledges receipt of a copy of the assignment by [NAME OF GRANTOR]
("Grantor") of its interest under the [TITLE OF APPLICABLE AGREEMENT] (the
"[Partnership] [LLC] Agreement") pursuant to the terms of the Security
Agreement, dated as of [Date] (as amended, modified or supplemented from time to
time in accordance with the terms thereof, the "Security Agreement"), among the
Grantor, the other grantors from time to time party thereto, and VantagePoint
Venture Partners III (Q), L.P., as administrative agent (the "Agent"). The
undersigned hereby further confirms (i) the registration of the Grantor's pledge
of its interest to the Agent on behalf of the Secured Creditors on the
[Partnership's] [LLC's] books and (ii) upon receipt from the Agent of a notice
stating that an "Event of Default" has occurred and is continuing, the
undersigned shall only comply with instructions originated by the Agent with
respect to the pledge of the interest referred to above notwithstanding contrary
instructions given by any other person or entity, including the Grantor until
such time as otherwise notified by the Agent.

Dated:   _______, ____

                                              [NAME OF PLEDGED ENTITY]

                                              BY
                                                 ------------------------------
                                                 Name:
                                                 Title:
<PAGE>
                                    Exhibit B
                                    ---------
                              To Security Agreement
                              ---------------------

                            [SEPARATE INSTRUMENT FOR
                            EACH FORM OF COLLATERAL]

                           GRANT OF SECURITY INTEREST
                           --------------------------

                        [PATENTS][TRADEMARKS][COPYRIGHTS]

         THIS GRANT OF SECURITY INTEREST, dated as of ________________, 2002, is
executed by [GRANTOR], a [state of incorporation] corporation ("Grantor"), in
favor of VantagePoint Venture Partners III (Q), L.P., as administrative agent on
behalf of the Guarantors and itself ("Agent").

         A. Grantor has entered into a Security Agreement, dated the date hereof
(the "Security Agreement"), by and between between DSL.Net, Inc., DSLnet
Communications Delaware, Inc., DSLnet Communications Puerto Rico, Inc., DSLnet
Communications VA, Inc., Tycho Networks, Inc., Vector Internet Services, Inc.,
and certain guarantors party thereto (the "Guarantors") in favor of Agent;

         [B. Grantor owns the letters patent, and/or applications for letters
patent, of the United States, more particularly described on Schedules 1-A and
1-B annexed hereto as part hereof (collectively, the "Patents");]

         [B. Grantor has adopted, used and is using the trademarks, more
particularly described on Schedules 1-A and 1-B annexed hereto as part hereof,
which trademarks are registered or subject to an application for registration in
the United States Patent and Trademark Office (collectively, the "Trademarks");]

         [B. Grantor owns the copyrights registered in the United States
Copyright Office, more particularly described on Schedule 1-A annexed hereto as
part hereof (collectively, the "Copyrights");]

         [C. Pursuant to the Security Agreement, Grantor has granted to Agent,
for the benefit of the Guarantors and itself, a security interest in all right,
title and interest of Grantor in and to the Patents, together with any reissue,
continuation, continuation-in-part or extension thereof, and all proceeds
thereof, including any and all causes of action which may exist by reason of
infringement thereof for the full term of the Patents (the "Collateral"), to
secure the prompt payment, performance and observance of the Obligations, as
defined in the Security Agreement;

         [C. Pursuant to the Security Agreement, Grantor has granted to Agent,
for the benefit of the Guarantors and itself, a security interest in all right,
title and interest of Grantor in and to the Trademarks, together with the
goodwill of the business symbolized by the Trademarks and the customer lists and
records related to the Trademarks and the applications and registrations
thereof, and all proceeds thereof, including any and all causes of action which
may exist by reason of infringement thereof (the "Collateral"), to secure the
payment, performance and observance of the Obligations, as defined in the
Security Agreement;]
<PAGE>

         [C. Pursuant to the Security Agreement, Grantor has granted to Agent,
for the benefit of the Guarantors and itself, a security interest in all right,
title and interest of Grantor in and to the Copyrights and the registrations
thereof, together with any renewals or extensions thereof, and all proceeds
thereof, including any and all causes of action which may exist by reason of
infringement thereof for the full term of the Copyrights (the "Collateral"), to
secure the prompt payment, performance and observance of the Obligations, as
defined in the Security Agreement;]

         NOW, THEREFORE, for good and valuable consideration, receipt of which
is hereby acknowledged, Grantor does hereby further grant to Agent a security
interest in the Collateral to secure the prompt payment, performance and
observance of the Obligations.

         Grantor does hereby further acknowledge and affirm that the rights and
remedies of Agent with respect to the security interest in the Collateral
granted hereby are more fully set forth in the Security Agreement, the terms and
provisions of which are hereby incorporated herein by reference as if fully set
forth herein.

         Agent's address is:   VantagePoint Venture Partners III (Q), L.P.,
                               as Agent
                               1001 Bayhill Drive, Suite 300
                               San Bruno, CA  94066

                               [Remainder of page intentionally left blank]
<PAGE>

         IN WITNESS WHEREOF, Grantor has caused this instrument to be executed
as of the day and year first above written.

[GRANTOR]

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

Name:
     ---------------------------------------

Title:
      --------------------------------------

<PAGE>
                   SCHEDULE 1-A TO GRANT OF SECURITY INTEREST
                   ------------------------------------------

                                     PATENTS
                                     -------

         Title                     Date Issued                        Patent No.

                   SCHEDULE 1-B TO GRANT OF SECURITY INTEREST
                   ------------------------------------------

                               PATENT APPLICATIONS
                               -------------------

         Title                   Application Date                Application No.

<PAGE>
                   SCHEDULE 1-A TO GRANT OF SECURITY INTEREST
                   ------------------------------------------

                                   TRADEMARKS
                                   ----------

         Mark                   Registration Date               Registration No.

                   SCHEDULE 1-B TO GRANT OF SECURITY INTEREST
                   ------------------------------------------

                             TRADEMARK APPLICATIONS
                             ----------------------

         Mark                   Application Date                 Application No.

<PAGE>
                   SCHEDULE 1-A TO GRANT OF SECURITY INTEREST
                   ------------------------------------------

                                   COPYRIGHTS
                                   ----------

         Description            Registration Date               Registration No.EXHIBIT 10.25
                                                                   -------------

                                    GUARANTY
                                    --------

         GUARANTY, dated as of December 27, 2002, by VANTAGEPOINT VENTURE
PARTNERS III (Q), L.P., a Delaware limited partnership (the "Guarantor"), in
favor of FLEET NATIONAL BANK, a national banking association (the "Lender").

         WHEREAS, DSL.NET, INC., a Delaware corporation (the "Company"), has
entered into a Revolving Credit and Term Loan Agreement dated as of December 13,
2002 (as amended and in effect from time to time, the "Credit Agreement"), with
the Lender, pursuant to which the Lender, subject to the terms and conditions
contained therein, is to make loans or otherwise to extend to the Company;

         WHEREAS, the Guarantor owns certain of the capital stock of the
Company;

         WHEREAS, the Guarantor expects to receive substantial direct and
indirect benefits from the extensions of credit to the Company by the Lender
pursuant to the Credit Agreement (which benefits are hereby acknowledged);

         WHEREAS, it is a condition precedent to the Lender's making any loans
or otherwise extending credit to the Company under the Credit Agreement that the
Guarantor execute and deliver to the Lender a guaranty substantially in the form
hereof; and

         WHEREAS, the Guarantor wishes to guaranty the Company's obligations to
the Lender under or in respect of the Credit Agreement as provided herein;

         NOW, THEREFORE, the Guarantor hereby agrees with the Lender as follows:

         1. DEFINITIONS. Unless otherwise defined herein, all capitalized terms
used herein without definition shall have the respective meanings provided
therefor in the Credit Agreement.

         The term "Capital Call Obligation" means, as to the Guarantor, the
obligation of each Partner to pay his, her or its Unpaid Capital Commitment in
accordance with the terms and obligations of the Partnership Agreement of the
Guarantor.

         The term "Capital Commitment" means, as to the Guarantor, the total
amount agreed to be paid to the Guarantor by each Partner of the Guarantor, all
as set forth in the Partnership Agreement of the Guarantor.

         The term "Capital Contribution" means, as to the Guarantor, with
respect to any Partner of the Guarantor, that portion of such Partner's Capital
Commitment which has already been paid, funded or otherwise satisfied by such
Partner as of any date of determination.
<PAGE>
                                       -2-

         The term "Credit Agreement Guarantor" means a "Guarantor" as defined in
the Credit Agreement which has executed and delivered a Credit Agreement
Guaranty.

         The term "Credit Agreement Guaranty" means each "Guaranty" as defined
in the Credit Agreement, and which guaranty remains in full force and effect.

         The term "Defaulted Capital Call Obligations" means, as to the
Guarantor, any and all Capital Call Obligations of all Defaulting Partners, to
the extent that the Capital Commitments of such Defaulting Partners have not
otherwise been purchased by or allocated to other Partners of the Guarantor
which are not Defaulting Partners pursuant to the terms of the Partnership
Agreement of the Guarantor within thirty (30) days after any such Partner
becomes a Defaulting Partner.

         The term "Defaulting Partner" means, as to the Guarantor, any Partner
who or which (a) is considered a "Defaulting Limited Partner" under the terms of
the Partnership Agreement or (b) fails to pay any Capital Call Obligation on or
before the fifteenth (15th) Business Day following the date on which the General
Partner requires such payment pursuant to a written notice of a Capital Call to
such Partners, unless and until such failure to pay any such Capital Call
Obligation is subsequently cured or waived with the consent of, and to the
satisfaction of, the General Partner and the Lender.

         The term "Eligible Capital Call Commitments" means, as to the
Guarantor, the aggregate Capital Call Obligations of the Guarantor's Partners
(a) that are not subject to any lien, security interest or other encumbrance;
(b) that have not been paid (and are not the subject of any capital call which
has been made by the Guarantor's general partner but not yet funded by the
Partner and are not otherwise committed by such general partner) or otherwise
funded by the Partner or Partners; and (c) that do not include amounts with
respect to Defaulted Capital Call Obligations or (without duplication) amounts
with respect to any other Capital Call Obligations payable by a Defaulting
Partner.

         The term "General Partner" means VantagePoint Venture Associates III,
L.L.C., a Delaware limited liability company, in its capacity as general partner
of the Guarantor, or any Person substituted for or who succeeds VantagePoint
Venture Associates III, L.L.C. pursuant to the terms of the Partnership
Agreement and with the consent of the Lender.

         The term "Guarantor Credit Agreement" means that certain Revolving
Credit Agreement dated as of February 29, 2000 by and among the Guarantors,
Fleet National Bank and certain other lending institutions party thereto
(collectively, the "Credit Agreement Banks") and Fleet National Bank as agent
for such Credit Agreement Banks (the "Credit Agreement Agent"), as the same may
be amended, restated, supplemented and/or modified from time to time.
<PAGE>
                                       -3-

         The term "Indebtedness" shall mean, as to any individual, corporation,
partnership, trust, unincorporated association, business or other legal entity
and any government or any governmental agency or political subdivision thereof
(collectively, a "Person") and whether recourse is secured by or is otherwise
available against all or only a portion of the assets of such Person and whether
or not contingent, but without duplication: (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, (iv) every obligation of such Person issued or assumed as the deferred
purchase price of property or services (including securities repurchase
agreements but excluding trade accounts payable or accrued liabilities arising
in the ordinary course of business which are not overdue or which are being
contested in good faith), (v) every obligation of such Person under any
capitalized lease, (vi) every obligation of such Person under any lease (a
"synthetic lease") treated as an operating lease under generally accepted
accounting principles and as a loan or financing for U.S. income tax purposes,
(vii) all sales by such Person of (A) accounts or general intangibles for money
due or to become due, (B) chattel paper, instruments or documents creating or
evidencing a right to payment of money or (C) other receivables (collectively
"receivables"), whether pursuant to a purchase facility or otherwise, other than
in connection with the disposition of the business operations of such Person
relating thereto or a disposition of defaulted receivables for collection and
not as a financing arrangement, and together with any obligation of such Person
to pay any discount, interest, fees, indemnities, penalties, recourse, expenses
or other amounts in connection therewith, (viii) every obligation of such Person
(an "equity related purchase obligation") to purchase, redeem, retire or
otherwise acquire for value any shares of capital stock of any class issued by
such Person, any warrants, options or other rights to acquire any such shares,
or any rights measured by the value of such shares, warrants, options or other
rights, (ix) every obligation of such Person under any forward contract, futures
contract, swap, option or other financing agreement or arrangement (including,
without limitation, caps, floors, collars and similar agreements), the value of
which is dependent upon interest rates, currency exchange rates, commodities or
other indices (a "derivative contract"), (x) every obligation in respect of
Indebtedness of any other entity (including any partnership in which such Person
is a general partner) to the extent that such Person is liable therefor as a
result of such Person's ownership interest in or other relationship with such
entity, except to the extent that the terms of such Indebtedness provide that
such Person is not liable therefor and such terms are enforceable under
applicable law, (xi) every obligation, contingent or otherwise, of such Person
guaranteeing, or having the economic effect of guarantying or otherwise acting
as surety for, any obligation of a type described in any of clauses (i) through
(x) (the "primary obligation") of another Person (the "primary obligor"), in any
manner, whether directly or indirectly, and including, without limitation, any
obligation of such Person (A) to purchase or pay (or advance or supply funds for
the purchase of) any security for the payment of such primary obligation, (B) to
purchase property, securities or services for the purpose of assuring the
payment of such primary obligation, or (C) 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 primary obligation.
<PAGE>
                                       -4-

         The term "Partner" means, as to the Guarantor, any Person who or which
holds a limited partnership interest in the Guarantor pursuant to the
Partnership Agreement of the Guarantor.

         The term "Partnership Agreement" shall mean the Limited Partnership
Agreement of VantagePoint Venture Partners III (Q), L.P. dated as of May 24,
1999 by and among the General Partner and the Partners.

         The term "Pro Rata Share" shall mean, as to each Credit Agreement
Guarantor, that portion of the principal amount of the Obligations which are
guaranteed by such Credit Agreement Guarantor pursuant to a Credit Agreement
Guaranty as compared to the principal amount of the Obligations which are
guaranteed by all Credit Agreement Guarantors pursuant to all Credit Agreement
Guarantees.

         The term "Related Guarantees" shall mean each Credit Agreement Guaranty
issued to the Lender from any Credit Agreement Guarantor other than the
Guarantor.

         The term "Total Guarantor Obligations" means, as to the Guarantor, the
sum of (a) the Obligations which are guaranteed by the Guarantor pursuant to
this Guaranty, plus (b) the sum of (i) outstanding Revolving Credit Loans (as
such term is defined in the Guarantor Credit Agreement) plus the Maximum Drawing
Amount (as such term is defined in the Guarantor Credit Agreement) of all issued
and outstanding Letters of Credit (as such term is defined in the Guarantor
Credit Agreement) plus all Unpaid Reimbursement Obligations (as such term is
defined in the Guarantor Credit Agreement) plus (ii) the aggregate amount of all
Indebtedness of the Guarantor consisting of the guarantees by the Guarantor of
the Indebtedness of any Portfolio Companies (as such term is defined under the
Partnership Agreement), provided, however, to the extent the Guarantor Credit
Agreement has been terminated, then (b)(i) hereof shall be the aggregate amount
of any obligations, whether contingent or otherwise, of the Guarantor for
borrowed money as of such date of determination.

         The term "Unpaid Capital Commitment" means, as to the Guarantor, with
respect to any Partner of the Guarantor, such Partner's Capital Commitment less
such Partner's Capital Contribution.

         2. GUARANTY OF PAYMENT AND PERFORMANCE. The Guarantor hereby guarantees
to the Lender the full and punctual payment when due (whether at stated
maturity, by required pre-payment, by acceleration or otherwise), as well as the
performance, of all of the Obligations including all such which would become due
but for the operation of the automatic stay pursuant to ss.362(a) of the Federal
Bankruptcy Code and the operation of ss.ss.502(b) and 506(b) of the Federal
Bankruptcy Code. In addition, the Guarantor agrees that payments by the
Guarantor hereunder shall be made without recoupment, setoff or counterclaim and
free and clear of and without deduction for any taxes, levies, imposts, duties,
charges, fees, deductions, withholdings, compulsory loans, restrictions or
conditions of any nature now or hereafter imposed or levied by any jurisdiction
or any political subdivision thereof or taxing or other authority therein unless
the Guarantor is compelled by law to make such deduction or withholding. If any
<PAGE>
                                       -5-

such obligation is imposed upon the Guarantor with respect to any amount payable
by it hereunder or under any of the other Loan Documents, the Guarantor will pay
to the Lender, on the date on which such amount is due and payable under any
Loan Document, such additional amount in United States dollars as shall be
necessary to enable the Lender to receive the same net amount which the Lender
would have received on such due date had no such obligation been imposed upon
the Guarantor. This Guaranty is an absolute, unconditional and continuing
guaranty of the full and punctual payment and performance of all of the
Obligations and not of their collectibility only and is in no way conditioned
upon any requirement that the Lender first attempt to collect any of the
Obligations from the Company or resort to any collateral security or other means
of obtaining payment. Should the Company default in the payment or performance
of any of the Obligations, the obligations of the Guarantor hereunder with
respect to such Obligations in default shall, upon demand by the Lender, become
immediately due and payable to the Lender, without demand or notice of any
nature, all of which are expressly waived by the Guarantor. Payments by the
Guarantor hereunder may be required by the Lender on any number of occasions.

         3. GUARANTOR'S AGREEMENT TO PAY ENFORCEMENT COSTS, ETC. The Guarantor
further agrees, as the principal obligor and not as a guarantor only, to pay to
the Lender, on demand, all reasonable costs and expenses (including court costs
and legal expenses) incurred or expended by the Lender in connection with the
Obligations, this Guaranty and the enforcement thereof, together with interest
on amounts recoverable under this ss.3 from the time when such amounts become
due until payment, whether before or after judgment, at the rate of interest for
overdue principal set forth in the Note, provided that if such interest exceeds
the maximum amount permitted to be paid under applicable law, then such interest
shall be reduced to such maximum permitted amount.

         4. LIMITED GUARANTY. Notwithstanding any other term or provision of
this Guaranty to the contrary, the Guarantor's liability hereunder shall be
limited to an amount equal to (a) $5,000,000 in principal amount, plus, without
limitation as to the amounts thereof, (b) the Guarantor's Pro Rata Share of all
interest, banking charges, commissions, costs and reasonable expenses chargeable
to the Company in respect of the Obligations (other than costs and expenses,
including attorneys fees, incurred in connection with the enforcement against
the Company of the Credit Agreement or other Loan Documents, unless the Lender
is required to incur just costs and/or expenses prior to being able to demand
payment hereunder), plus (c) the Guarantor's Pro Rata Share of all interest and
other costs and reasonable expenses payable by the Guarantor pursuant to ss.3
hereof (other than costs and expenses, including attorneys fees, incurred in
connection with the enforcement against the Company of the Credit Agreement or
other Loan Documents, unless the Lender is required to incur just costs and/or
expenses prior to being able to demand payment hereunder), provided, the
Guarantor shall pay all of the costs and expenses incurred or expended by the
Lender in connection with this Guaranty and the enforcement thereof. Each
payment made by the Guarantor hereunder which is applied against the Obligations
referred to in clause (a) above shall reduce the Guarantor's liability by such
amount. The Lender's dealings with the Company need not be limited to any
particular sum notwithstanding any limitation herein upon the liability of the
<PAGE>
                                       -6-

Guarantor. The Lender hereby agrees that to the extent it shall require any
payments be made hereunder, the Lender will, to the extent permissable,
simultaneously make a claim for payment on all Credit Agreement Guarantees such
that any payment being required to be made hereunder will not exceed the
Guarantor's Pro Rata Share of the aggregate amount being claimed by the Lender
under all Credit Agreement Guarantees (and, to the extent the Lender is not
permitted or otherwise able to make a claim under any Credit Agreement Guaranty,
the Lender shall be deemed to have made such a claim under such Credit Agreement
Guaranty for purposes of this sentence).

         5. WAIVERS BY GUARANTOR; LENDER'S FREEDOM TO ACT. The Guarantor agrees
that the Obligations will be paid and performed strictly in accordance with
their respective terms, regardless of any law, regulation or order now or
hereafter in effect in any jurisdiction affecting any of such terms or the
rights of the Lender with respect thereto. The Guarantor waives promptness,
diligences, presentment, demand, protest, notice of acceptance, notice of any
Obligations incurred and all other notices of any kind, all defenses which may
be available by virtue of any valuation, stay, moratorium law or other similar
law now or hereafter in effect, any right to require the marshalling of assets
of the Company or any other entity or other person primarily or secondarily
liable with respect to any of the Obligations, and all suretyship defenses
generally. Without limiting the generality of the foregoing, the Guarantor
agrees to the provisions of any instrument evidencing, securing or otherwise
executed in connection with any Obligation and agrees that the obligations of
the Guarantor hereunder shall not be released or discharged, in whole or in
part, or otherwise affected by (a) the failure of the Lender to assert any claim
or demand or to enforce any right or remedy against the Company or any other
entity or other person primarily or secondarily liable with respect to any of
the Obligations; (b) any extensions, compromise, refinancing, consolidation or
renewals of any Obligation; (c) any change in the time, place or manner of
payment of any of the Obligations or any rescissions, waivers, compromise,
refinancing, consolidation, amendments or modifications of any of the terms or
provisions of the Credit Agreement, the other Loan Documents or any other
agreement evidencing, securing or otherwise executed in connection with any of
the Obligations; (d) the addition, substitution or release of any entity or
other person primarily or secondarily liable for any Obligation, (e) the
adequacy of any rights which the Lender may have against any collateral security
or other means of obtaining repayment of any of the Obligations; (f) the
impairment of any collateral securing any of the Obligations, including without
limitation the failure to perfect or preserve any rights which the Lender might
have in such collateral security or the substitution, exchange, surrender,
release, loss or destruction of any such collateral security; or (g) any other
act or omission which might in any manner or to any extent vary the risk of the
Guarantor or otherwise operate as a release or discharge of the Guarantor, all
of which may be done without notice to the Guarantor. To the fullest extent
permitted by law, the Guarantor hereby expressly waives any and all rights or
defenses arising by reason of (i) any "one action" or "anti-deficiency" law
which would otherwise prevent the Lender from bringing any action, including any
claim for a deficiency, or exercising any other right or remedy (including any
right of set-off), against the Guarantor before or after the Lender's
<PAGE>
                                       -7-

commencement or completion of any foreclosure action, whether judicially, by
exercise of power of sale or otherwise, or (ii) any other law which in any other
way would otherwise require any election of remedies by the Lender.

         6. UNENFORCEABILITY OF OBLIGATIONS AGAINST COMPANY. If for any reason
the Company has no legal existence or is under no legal obligation to discharge
any of the Obligations, or if any of the Obligations have become irrecoverable
from the Company by reason of the Company's insolvency, bankruptcy or
reorganization or by other operation of law or for any other reason, this
Guaranty shall nevertheless be binding on the Guarantor to the same extent as if
the Guarantor at all times had been the principal obligor on all such
Obligations. In the event that acceleration of the time for payment of any of
the Obligations is stayed upon the insolvency, bankruptcy or reorganization of
the Company, or for any other reason, all such amounts otherwise subject to
acceleration under the terms of the Credit Agreement, the other Loan Documents
or any other agreement evidencing, securing or otherwise executed in connection
with any Obligation shall be immediately due and payable by the Guarantor.

         7.  SUBROGATION; SUBORDINATION.

                  7.1. WAIVER OF RIGHTS AGAINST COMPANY. Until the final payment
         and performance in full of all of the Obligations, the Guarantor shall
         not exercise any rights against the Company arising as a result of
         payment by the Guarantor hereunder, by way of subrogation,
         reimbursement, restitution, contribution or otherwise, and will not
         prove any claim in competition with the Lender in respect of any
         payment hereunder in any bankruptcy, insolvency or reorganization case
         or proceedings of any nature; the Guarantor will not claim any setoff,
         recoupment or counterclaim against the Company in respect of any
         liability of the Guarantor to the Company; and the Guarantor waives any
         benefit of and any right to participate in any collateral security
         which may be held by the Lender.

                  7.2. SUBORDINATION. The payment of any amounts due with
         respect to any indebtedness of the Company now or hereafter owed to the
         Guarantor is hereby subordinated to the prior payment in full of all of
         the Obligations, to the extent and in the manner set forth in the next
         sentence. The Guarantor agrees that, after the occurrence and during
         the continuance of any default in the payment or performance of any of
         the Obligations, the Guarantor will not demand, sue for or otherwise
         attempt to collect any such indebtedness of the Company to the
         Guarantor until all of the Obligations shall have been paid in full.
         If, notwithstanding the foregoing sentence, the Guarantor shall
         collect, enforce or receive any amounts in respect of such
         indebtedness, such amounts shall be collected, enforced and received by
         the Guarantor as trustee for the Lender and be paid over to the Lender
         on account of the Obligations without affecting in any manner the
         liability of the Guarantor under the other provisions of this Guaranty.
<PAGE>
                                       -8-

                  7.3. PROVISIONS SUPPLEMENTAL. The provisions of this ss.7
         shall be supplemental to and not in derogation of any rights and
         remedies of the Lender under any separate subordination agreement which
         the Lender may at any time and from time to time enter into with the
         Guarantor.

         8. SECURITY; SETOFF. The Guarantor grants to the Lender, as security
for the full and punctual payment and performance of all of the Guarantor's
obligations hereunder, a continuing lien on and security interest in all
securities or other property belonging to the Guarantor now or hereafter held by
the Lender and in all deposits (general or special, time or demand, provisional
or final) and other sums credited by or due from the Lender to the Guarantor or
subject to withdrawal by the Guarantor. Regardless of the adequacy of any
collateral security or other means of obtaining payment of any of the
Obligations, the Lender is hereby authorized at any time and from time to time,
without notice to the Guarantor (any such notice being expressly waived by the
Guarantor) and to the fullest extent permitted by law, to set off and apply such
deposits and other sums against the obligations of the Guarantor under this
Guaranty, whether or not the Lender shall have made any demand under this
Guaranty and although such obligations may be contingent or unmatured.

         9.  REPRESENTATIONS; COVENANTS AND FURTHER ASSURANCES.

                  9.1. REPRESENTATIONS. Each of the Guarantor and the General
         Partner, in its capacity as sole general partner of the Guarantor
         hereby represents and warrants to the Lender that (a) each of the
         Guarantor and General Partner is duly organized, validly existing, and
         in good standing under the laws of its jurisdiction of formation, and
         the execution, delivery and performance by the Guarantor and the
         General Partner of this Guaranty and the other Loan Documents to which
         it is a party (i) are within its partnership or limited liability
         company (as the case may be) authority, (ii) have been duly authorized
         by all appropriate action, (iii) do not conflict with or contravene its
         Partnership Agreement, operating agreement, or any law, rule, order or
         regulation; (b) upon the execution and delivery thereof, the Guaranty
         and each other Loan Document shall constitute the legal, valid and
         binding obligation of the Guarantor party thereto, enforceable in
         accordance with its terms; (c) the financial statements provided to the
         Lender as at September 30, 2002 are complete and correct and fairly
         present the position of the Guarantor as at such date and for such
         period in accordance with generally accepted accounting principles
         consistently applied; and (d) the execution, delivery, performance of
         its obligations, and exercise of its rights under the Guaranty and the
         other Loan Documents by the Guarantor (i) do not require any consents
         or approvals; and (ii) are not and will not be in conflict with or
         prohibited or prevented by (A) any law, rule, order or regulation, or
         (B) its Partnership Agreement or any partnership action.

                  9.2. COVENANTS. The Guarantor agrees that at all times the
         ratio of (a) Eligible Capital Call Commitments of the Guarantor to (b)
         Total Guarantor Obligations of the Guarantor shall not be less than
         1.33:1.00. Not later than forty-five (45) days after the end of each
<PAGE>
                                       -9-

         fiscal quarter, the Guarantor shall provide to the Lender evidence
         demonstrating compliance with this covenant contained in ss.9.2 To the
         extent the ratio of (a) Eligible Capital Call Commitments of a
         Guarantor to (b) Total Guarantor Obligations for the Guarantor is less
         than 1.33:1.00, upon demand by the Lender, the Guarantor shall deposit
         with the Lender cash collateral in an amount sufficient so that when
         added to the Eligible Capital Call Commitment portion of such ratio,
         the Guarantor complies with the covenant set forth in this ss.9.2. In
         addition, the Guarantor agrees that so long as any Obligation is
         outstanding, the Guarantor will not (1) create, incur, assume,
         guarantee or be or remain liable, contingently or otherwise, with
         respect to any Indebtedness other than Indebtedness permitted by ss.7.1
         of the Guarantor Credit Agreement; (2) create or incur or suffer to be
         created or incurred or permit to exist any lien, encumbrance, mortgage,
         pledge, charge, restriction or other security interest of any kind upon
         any Capital Call Obligation or the Guarantor's rights to receive such
         payments, or (3) or enter into any agreement prohibiting the creation
         or assumption of any lien upon its properties, revenues or assets,
         whether now owned or hereafter acquired, unless otherwise permitted by
         the Guarantor Credit Agreement.

                  9.3. FURTHER ASSURANCES. The Guarantor agrees that it will
         from time to time, at the request of the Lender, provide to the Lender
         the Guarantor's most recent audited and unaudited balance sheets and
         related statements of income and changes in financial condition and
         such other information relating to the business and affairs of the
         Guarantor as the Lender may reasonably request. The Guarantor also
         agrees to do all such things and execute all such documents as the
         Lender may consider reasonably necessary or desirable to give full
         effect to this Guaranty and to perfect and preserve the rights and
         powers of the Lender hereunder. The Guarantor acknowledges and confirms
         that the Guarantor itself has established its own adequate means of
         obtaining from the Company on a continuing basis all information
         desired by the Guarantor concerning the financial condition of the
         Company and that the Guarantor will look to the Company and not to the
         Lender in order for the Guarantor to keep adequately informed of
         changes in the Company's financial condition.

         10. TERMINATION; REINSTATEMENT. This Guaranty shall remain in full
force and effect until the Lender is given written notice of the Guarantor's
intention to discontinue this Guaranty, notwithstanding any intermediate or
temporary payment or settlement of the whole or any part of the Obligations. No
such notice shall be effective unless received and acknowledged by an officer of
the Lender at the address of the Lender for notices set forth in the Credit
Agreement. No such notice shall affect any rights of the Lender hereunder,
including without limitation the rights set forth in ss.ss.5 and 7, with respect
to any Obligations incurred or accrued prior to the receipt of such notice or
any Obligations incurred or accrued pursuant to any contract or commitment in
existence prior to such receipt, and all checks, drafts, notes, instruments
(negotiable or otherwise) and writings made by or for the account of the Company
and drawn on the Lender or any of its agents purporting to be dated on or before
the date of receipt of such notice, although presented to and paid or accepted
by the Lender after that date, shall form part of the Obligations. This Guaranty
<PAGE>
                                      -10-

shall continue to be effective or be reinstated, notwithstanding any such
notice, if at any time any payment made or value received with respect to any
Obligation is rescinded or must otherwise be returned by the Lender upon the
insolvency, bankruptcy or reorganization of the Company, or otherwise, all as
though such payment had not been made or value received. In addition, promptly
after the Obligations have been indefeasibly repaid in full in cash and all
Commitments have been terminated, the Lender will return to the Guarantor the
Guaranty marked "terminated" and/or "cancelled".

         11. SUCCESSORS AND ASSIGNS. This Guaranty shall be binding upon the
Guarantor, its successors and assigns, and shall inure to the benefit of and be
enforceable by the Lender and its successors, transferees and assigns. Without
limiting the generality of the foregoing sentence, the Lender may assign or
otherwise transfer the Credit Agreement, the other Loan Documents or any other
agreement or note held by it evidencing, securing or otherwise executed in
connection with the Obligations, or sell participations in any interest therein,
to any other entity or other person, and such other entity or other person shall
thereupon become vested, to the extent set forth in the agreement evidencing
such assignment, transfer or participation, with all the rights in respect
thereof granted to the Lender herein. The Guarantor may not assign any of its
obligations hereunder.

         12. AMENDMENTS AND WAIVERS. No amendment or waiver of any provision of
this Guaranty nor consent to any departure by the Guarantor therefrom shall be
effective unless the same shall be in writing and signed by the Guarantor and
the Lender. No failure on the part of the Lender to exercise, and no delay in
exercising, any right hereunder shall operate as a waiver thereof; nor shall any
single or partial exercise of any right hereunder preclude any other or further
exercise thereof or the exercise of any other right.

         13. NOTICES. All notices and other communications called for hereunder
shall be made in writing and, unless otherwise specifically provided herein,
shall be deemed to have been duly made or given when delivered by hand or mailed
first class, postage prepaid, or, in the case of telegraphic or telexed notice,
when transmitted, answer back received, addressed as follows: if to the
Guarantor, at the address set forth beneath its signature hereto, and if to the
Lender, at the address for notices to the Lender set forth in the Credit
Agreement, or at such address as either party may designate in writing to the
other.

         14. GOVERNING LAW; CONSENT TO JURISDICTION. THIS GUARANTY IS INTENDED
TO TAKE EFFECT AS A SEALED INSTRUMENT AND SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS. The Guarantor
agrees that any suit for the enforcement of this Guaranty may be brought in the
courts of the Commonwealth of Massachusetts or any federal court sitting therein
and consents to the nonexclusive jurisdiction of such court and to service of
process in any such suit being made upon the Guarantor by mail at the address
specified by reference in ss.13. The Guarantor hereby waives any objection that
<PAGE>
                                      -11-

it may now or hereafter have to the venue of any such suit or any such court or
that such suit was brought in an inconvenient court.

         15. WAIVER OF JURY TRIAL. THE GUARANTOR HEREBY WAIVES ITS RIGHT TO A
JURY TRIAL WITH RESPECT TO ANY ACTION OR CLAIM ARISING OUT OF ANY DISPUTE IN
CONNECTION WITH THIS GUARANTY, ANY RIGHTS OR OBLIGATIONS HEREUNDER OR THE
PERFORMANCE OF ANY OF SUCH RIGHTS OR OBLIGATIONS. Except as prohibited by law,
the Guarantor hereby waives any right which it may have to claim or recover in
any litigation referred to in the preceding sentence any special, exemplary,
punitive or consequential damages or any damages other than, or in addition to,
actual damages. The Guarantor (a) certifies that neither the Lender nor any
representative, agent or attorney of the Lender has represented, expressly or
otherwise, that the Lender would not, in the event of litigation, seek to
enforce the foregoing waivers and (b) acknowledges that, in entering into the
Credit Agreement and the other Loan Documents to which the Lender is a party,
the Lender is relying upon, among other things, the waivers and certifications
contained in this ss.15.

         16. MISCELLANEOUS. This Guaranty constitutes the entire agreement of
the Guarantor and the Lender with respect to the matters set forth herein. The
rights and remedies herein provided are cumulative and not exclusive of any
remedies provided by law or any other agreement, and this Guaranty shall be in
addition to any other guaranty of or collateral security for any of the
Obligations. The invalidity or unenforceability of any one or more sections of
this Guaranty shall not affect the validity or enforceability of its remaining
provisions. Captions are for the ease of reference only and shall not affect the
meaning of the relevant provisions. The meanings of all defined terms used in
this Guaranty shall be equally applicable to the singular and plural forms of
the terms defined.
<PAGE>
                                      -12-

         IN WITNESS WHEREOF, the Guarantor has caused this Guaranty to be
executed and delivered as of the date first above written.

                                    VANTAGEPOINT VENTURE PARTNERS III (Q), L.P.
                                    By:  VantagePoint Venture Associates III,
                                    LLC, its General Partner

                                    By: /s/ James D. Marver
                                        -------------------------------------
                                        Name: James D. Marver
                                        Title:
                                        Address:

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