Document:

REGISTRATION RIGHTS AGREEMENT

 Exhibit 4.5 
 REGISTRATION RIGHTS AGREEMENT 
 REGISTRATION
RIGHTS AGREEMENT, dated as of November 1, 2007 (this “Agreement”), among (i) NetScout Systems, Inc. (together with any successor entity the “Company”), (ii) Silver Lake Partners, L.P.
(“SLP”), Silver Lake Investors, L.P. (“SLI”) and Silver Lake Technology Investors, L.L.C. (“SLTI,” and together with SLP and SLI, the “Initial SLP Parties”), (iii) TPG
Starburst III, LLC (“TPG III”), TPG Starburst VI, LLC (“TPG IV”) and T3 Starburst II, LLC (“TPG II,” and
together with TPG III and TPG IV, the “Initial TPG Parties”), (iv) Integral Capital Partners VI, L.P. (“ICP,” and, together with the Initial SLP Parties and the Initial TPG Parties, the “Initial
Holders”) and (v) the Guarantors identified on the signature pages hereto (the “Guarantors”). 
 RECITALS 
 Upon the terms and subject to the conditions set forth in the Securities Purchase Agreement, dated
November 1, 2007 (the “Securities Purchase Agreement”), among the Company, the Guarantors and the Initial Holders, the Company has agreed to issue to the Initial Holders, and the Initial Holders have agreed to purchase from the
Company, $100,000,000 aggregate principal amount of Senior Secured Floating Rate Notes due 2012 (the “Notes”) under the Indenture (as defined below). 
 For good and valuable consideration, the receipt of which is hereby acknowledged, the Company desires to provide to each Holder (as defined below) the rights to register the Registrable Securities (as defined below)
held by them under the Securities Act (as defined below) on the terms and subject to the conditions set forth herein. 
 ARTICLE I 

DEFINITIONS 
 Section 1.1 Definitions. As used in this Agreement, the following capitalized terms shall have the following respective meanings: 
 “Action”: Any action, suit, arbitration, inquiry, proceeding or investigation by or before any governmental entity. 
 “Acquisition Closing Date”: The “Closing Date” as defined in the Agreement and Plan of Merger, dated as of September 19, 2007, by and among the Company, Bradley Merger Sub LLC, Network
General Corporation and Network General Central Corporation, as such agreement was amended on October 1, 2007 and is amended, modified or supplemented from time to time in accordance with the terms thereof. 
 “business day”: A day other than a Saturday, Sunday, federal or Massachusetts or California or New York state holiday, or other day on
which commercial banks in Massachusetts or California or New York are authorized or required by law to close. 

 “Exchange Act”: The Securities Exchange Act of 1934, as amended, and the rules and
regulations promulgated thereunder. 
 “Holder”: Any holder of Registrable Securities (including any direct or indirect
transferee of the Initial Holders) who agrees in writing to be bound by the provisions of this Agreement and, in the case of Holders other than the Initial Holders, specifies in such writing the address and facsimile number at which notices may be
given pursuant to this Agreement and delivers a copy of such writing to the Company. 
 “Indenture”: The Indenture, dated as
of November 1, 2007, among the Company, the Guarantors and Wells Fargo Bank, National Association, as trustee (the “Trustee”), pursuant to which the Notes are to be issued, as such Indenture is amended, modified or supplemented
from time to time in accordance with the terms thereof. 
 “Person”: Any individual, partnership, joint venture,
corporation, limited liability company, trust, unincorporated organization, enterprise or government or any department or agency thereof. 
 “Prior Shelf Registration Statement”: The collective reference to the Company’s Registration Statement on Form S-3, File No. 333-145047, and any registration statement filed pursuant to Rule 462(b) of the
Securities Act with respect thereto. 
 “Registrable Securities”: Each of (a) the Notes and (b) any securities
issued in or upon exchange or replacement of any Registrable Securities. Any particular Registrable Securities that are issued shall cease to be Registrable Securities when (i) a registration statement with respect to the sale by the Holder of
such securities shall have become effective under the Securities Act and such securities shall have been disposed of in accordance with such registration statement, (ii) such securities shall have been distributed to the public pursuant to Rule
144 (or any successor provision) under the Securities Act, (iii) such securities are eligible for transfer to the public pursuant to Rule 144(k) (or any similar provisions then in effect) under the Securities Act or (iv) such securities
shall have ceased to be outstanding. 
 “Registration Date”: May 18, 2008. 
 “Registration Default”: Any of the following events: (i) the applicable registration statement is not declared effective by the SEC
on or prior to the date which is the 90 days after the date it would be required to be initially filed with the SEC pursuant to this Agreement or (ii) the applicable registration statement is declared effective but thereafter ceases to be
effective or usable, other than as part of a permitted Suspension Period, for in excess of an aggregate of 60 days in any twelve-month period, in connection with the resales of Registrable Securities that are required by this Agreement to be covered
by such registration statement. 
 “Registration Default Date”: (i) In the case of a Registration Default described by
clause (i) of the definition thereof, the 90th day after the date that the Company learned that is was required to file a registration statement pursuant to this Agreement, or (ii) in the case of a Registration Default described by clause
(ii) of the definition thereof, the 60th day in any twelve-month period in which the applicable registration statement is not effective or is not usable as contemplated by such clause (ii). 
  

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 “Registration Expenses”: Any and all expenses incident to performance of or compliance
with this Agreement, including, without limitation, (i) all SEC and stock exchange or National Association of Securities Dealers, Inc. (the “NASD”) registration and filing fees (including, if applicable, the fees and expenses
of any “qualified independent underwriter,” as such term is defined in Rule 2720 of the NASD Manual, and of its counsel), (ii) all reasonable fees and expenses of complying with securities or blue sky laws (including fees and
disbursements of one counsel for the underwriters in connection with blue sky qualifications of the Registrable Securities), (iii) all printing, messenger and delivery expenses, (iv) all fees and expenses incurred in connection with the
listing of the Registrable Securities on any securities market or exchange and all rating agency fees, (v) the fees and disbursements of counsel for the Company and of its independent public accountants, including the expenses of any special
audits and/or comfort letters required by or incident to such performance and compliance, (vi) the reasonable fees and disbursements of one counsel selected pursuant to Section 6.1 hereof by the Holders of the Registrable Securities being
registered to represent such Holders in connection with each such registration; provided, however, that such fees and disbursements do not exceed $60,000 in connection with such registration (in which case, such excess shall not be
deemed a “Registration Expense”), (vii) any fees and disbursements of underwriters customarily paid by the issuers or sellers of securities, but excluding underwriting discounts and commissions and transfer taxes, if any,
(viii) any fees charged by rating agencies for rating the Registrable Securities; and (ix) reasonable fees and expenses incurred by the Company or the Holders participating in such registration in connection with any “road show”,
including travel and accommodations. 
 “Securities Act”: The Securities Act of 1933, as amended, and the rules and
regulations promulgated thereunder. 
 “SEC”: The Securities and Exchange Commission or any other federal agency at the time
administering the Securities Act or the Exchange Act and other federal securities laws. 
 “SLP Holders”: Each of the
Initial SLP Holders and any other Holder to whom an Initial SLP Holder has in accordance with Section 7.2 assigned rights to under this Agreement. 
 “TIA”: Trust Indenture Act of 1939, as amended, and the rules and regulations of the Commission thereunder, in each case, as in effect on the date the Indenture is qualified under the TIA. 

“TPG Holders”: Each of the Initial TPG Holders and any other Holder to whom an Initial TPG Holder has in accordance with
Section 7.2 assigned rights to under this Agreement. 
 ARTICLE II 
 REGISTRATION RIGHTS 
 Section 2.1 Demand Registration Rights.

 (a) Right to Demand Registration of Registrable Securities. Subject to the conditions of this Section 2.1, if the Company shall
receive a written request from one or more SLP Holders and/or TPG Holders (the “Initiating Holders”), that the 

  

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Company file a registration statement under the Securities Act covering the registration of Registrable Securities, then the Company shall, within
five (5) business days of the receipt thereof, give written notice of such request to all Holders, who must respond in writing within ten (10) business days requesting inclusion in such registration of such Holders’ Registrable
Securities of the same type or types that are being registered by the Initiating Holders (it being understood that all Notes will be deemed to be the same type of Registrable Securities). Each request must specify the amount and intended manner of
disposition of such Registrable Securities. The Company, subject to the limitations of this Section 2.1, must use its reasonable best efforts to effect, as soon as reasonably practicable, the registration under the Securities Act of all
Registrable Securities that the Holders request to be registered in accordance with this Section 2.1 together with any other securities of the Company entitled to inclusion in such registration; provided, however, that the Company
shall not be required to file a registration statement in connection with a written request pursuant to this paragraph (a) prior to the Registration Date. 
 (b) Shelf Registration Statement. If a written request made by the Initiating Holders under Section 2.1(a) hereof specifies that the intended manner of disposition of Registrable Securities is to be made
by means of a shelf registration providing for resales of such Registrable Securities, the Company shall use its reasonable best efforts to effect, as soon as reasonably practicable, the registration under the Securities Act of all Registrable
Securities that the Holders request to be so registered in accordance with Section 2.1(a) pursuant to a registration statement for an offering to be made on a continuous basis pursuant to Rule 415 (or successor provision) under the
Securities Act (together with any amendments thereto, and including any documents incorporated by reference therein, the “Shelf Registration Statement”), which Shelf Registration Statement shall provide for resales of such
Registrable Securities. 
 (c) Underwritten Offerings. If the Initiating Holders intend to distribute the Registrable Securities in
excess of $5 million covered by their request by means of an underwriting, they shall so advise the Company as a part of their request made pursuant to Section 2.1(a) hereof and the Company shall include such information in the written notice
referred to in such Section 2.1(a). In such event, the right of any Holder to include its Registrable Securities in such registration shall be conditioned upon such Holder’s participation in such underwriting and the inclusion of such
Holder’s Registrable Securities in the underwriting to the extent provided herein. All Holders proposing to distribute their securities through such underwriting shall enter into an underwriting agreement in customary form with the underwriter
or underwriters selected for such underwriting by a majority in interest of the Initiating Holders (which underwriter or underwriters shall be reasonably acceptable to the Company) and complete and execute all questionnaires, powers of attorney and
other documents reasonably required under the terms of such underwriting agreement and these registration rights; provided, however that (x) each such Holder shall only be obligated to (i) make representations and warranties
generally as to his, her or its respective (A) execution, delivery and performance of such underwriting agreement and the agreements contemplated thereby, (B) individual ownership of the Registrable Securities being sold pursuant to such
underwriting agreement and (C) information provided by such Registration Rights Holder in writing specifically for inclusion in the prospectus and (ii) agree to provide indemnification for any liability arising out of any such
representations or warranties of such Registration Rights Holder, and (y) in no event shall a Holder’s liability for such indemnification be greater in amount than the dollar amount of the gross 

  

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proceeds after underwriting discounts and commissions, but before expenses, received by such Holder for the sale of such Registrable Securities pursuant to
such underwriting agreement. Notwithstanding any other provision of this Section 2.1, if the managing underwriter advises the Company in writing that, in its opinion, marketing factors require a limitation of the amount of securities to be
underwritten (including Registrable Securities) because the amount of securities to be underwritten is likely to have an adverse effect on the price, timing or the distribution of the securities to be offered, then the Company shall so advise all
Holders of Registrable Securities which would otherwise be underwritten pursuant hereto, and the amount of Registrable Securities that may be included in the underwriting shall be allocated among participating Holders as nearly as possible on a pro
rata basis based on the total amount of Registrable Securities held by such Holders requested to be included in such underwriting. Any Registrable Securities excluded or withdrawn from such underwriting shall be withdrawn from the registration.

 (d) Underwritten Shelf Take-Downs. Notwithstanding the provisions of Section 2.1(c) hereof, subject to Section 3.1(xviii)
, if a Shelf Registration Statement has become effective in accordance with Section 2.1(b) hereof and any SLP Holder or TPG Holder (the “Initiating Shelf Holders”) of Registrable Securities covered by such Shelf Registration
Statement advises the Company in writing that it intends to sell its Registrable Securities pursuant to an underwritten “take-down” under such Shelf Registration Statement which could involve a customary “road show” (a
“Marketed Take-down”), then the Company shall, within five (5) business days of the receipt thereof, give written notice of such intention to all Holders of Registrable Securities under such Shelf Registration Statement, who
must respond in writing within ten (10) business days requesting inclusion of such Holders’ Registrable Securities in such Marketed Take-down. In such event, the right of any Holder to include its Registrable Securities in such Marketed
Take-down shall be conditioned upon such Holder’s participation in such Marketed Take-down and inclusion of such Holder’s Registrable Securities in the Marketed Take-down to the extent provided herein. All Holders proposing to distribute
their securities through such underwriting shall enter into an underwriting agreement in customary form with the underwriter or underwriters selected for such underwriting by a majority in interest of the Initiating Holders (which underwriter or
underwriters shall be reasonably acceptable to the Company); provided, however that (x) each such Holder shall only be obligated to (i) make representations and warranties generally as to his, her or its respective
(A) execution, delivery and performance of such underwriting agreement and the agreements contemplated thereby, (B) individual ownership of the Registrable Securities being sold pursuant to such underwriting agreement and
(C) information provided by such Registration Rights Holder in writing specifically for inclusion in the prospectus and (ii) agree to provide indemnification for any liability arising out of any such representations or warranties of such
Registration Rights Holder, and (y) in no event shall a Holder’s liability for such indemnification be greater in amount than the dollar amount of the gross proceeds after underwriting discounts and commissions, but before expenses,
received by such Holder for the sale of such Registrable Securities pursuant to such underwriting agreement. Notwithstanding any other provision of this Section 2.1, if the managing underwriter advises the Company in writing that, in its
opinion, marketing factors require a limitation of the amount of securities to be underwritten (including Registrable Securities) because the amount of securities to be underwritten is likely to have an adverse effect on the price, timing or the
distribution of the securities to be offered, then the Company shall so advise all Holders of Registrable 

  

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Securities which would otherwise be underwritten pursuant hereto, and the amount of Registrable Securities that may be included in the underwriting shall be
allocated among participating Holders as nearly as possible on a pro rata basis based on the total amount of Registrable Securities held by such Holders requested to be included in such underwriting. For avoidance of doubt, if any Holder desires to
sell its Registrable Securities pursuant to an underwritten “take-down” under the Shelf Registration Statement which does not involve a customary “road show”, then the other Holders will not have the right to participate in such
underwritten “take-down” (unless otherwise agreed by the initial selling Holder). 
 (e) Registration Limits.
Notwithstanding the foregoing, the Company shall not be required to effect a registration pursuant to this Section 2.1 (i) that will become effective prior to August 10, 2008 or (ii) in the case of (A) registrations
requested by the SLP Holders pursuant to Section 2.1(a) hereof after the Company has effected two (2) registrations requested by the SLP Holders pursuant to such Section; provided, however, that not more than one of such
registrations may be a Shelf Registration Statement, and (B) registrations requested by the TPG Holders pursuant to Section 2.1(a) hereof after the Company has effected two (2) registrations requested by the TPG Holders pursuant to
such Section; provided, however, that not more than one of such registrations may be a Shelf Registration Statement. Any requested Shelf Registration Statement pursuant to Section 2.1(b) hereof shall be kept effective until at least the
two-year anniversary of the effectiveness of the registration statement (plus the aggregate number of days in all Suspension Periods (as defined below), if any). The Holders shall have no rights under this Agreement with respect to the Prior
Registration Statement. 
 Section 2.2 Expenses. The Company will pay all Registration Expenses in connection with each
registration of Registrable Securities requested pursuant to this Article II. 
 Section 2.3 Registration Form. The Company
shall select the registration statement form for any registration pursuant to Section 2.1, but shall cooperate with the requests of the Initiating Holders or managing underwriters selected by them as to the inclusion therein of information not
specifically required by such form. 
 Section 2.4 Additional Interest. 
 (a) The Company acknowledges that the Holders will suffer damages if the Company fails to fulfill its obligations under Section 2.1 hereof and that
it would not be feasible to ascertain the extent of such damages with precision. Accordingly, the Company agrees to pay, as liquidated damages, additional interest on the Notes (“Additional Interest”) if a Registration Default
occurs. 
 (b) The rate at which Additional Interest will accrue will initially be 0.25% per annum, and will increase by an additional
0.25% per annum upon each day that is a whole-number multiple of 90 days after the date on which Additional Interest began to accrue so long as a Registration Default is continuing; provided, however, that the rate at which
Additional Interest accrues may in no event exceed 1.00% per annum. 
 (c) Additional Interest will accrue commencing on the day
following a Registration Default Date. Additional Interest will cease to accrue when all Registration Defaults have been cured (it being understood that Additional Interest shall accrue 

  

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again upon any subsequent Registration Default). A Registration Default described by clause (i) of the definition thereof shall be cured upon the
effectiveness of the applicable registration statement. A Registration Default described by clause (ii) of the definition thereof shall be cured upon the effectiveness or usability as contemplated by such clause (ii) of the applicable
registration statement which had ceased so to remain effective or usable. 
 The Company shall notify the Trustee of each and every
Registration Default, within five (5) business days after each and every Registration Default Date, and of the curing of each and every Registration Default within five (5) business days after such Registration Default is cured. The
Company shall notify the Trustee of the aggregate amount of Additional Interest to be paid on any interest payment date and the method by which the amount of Additional Interest was calculated. Additional Interest shall be paid by depositing with
the Trustee, in trust, for the benefit of the Holders of Registrable Securities, on or before the applicable interest payment date, immediately available funds in sums sufficient to pay the Additional Interest then due. The Additional Interest due
shall be payable on each interest payment date to the record Holder of Securities entitled to receive the interest payment to be paid on such date as set forth in the Indenture. 
 ARTICLE III 
 REGISTRATION PROCEDURES 
 Section 3.1 Registration Procedures. If and whenever the Company is required to use its reasonable best efforts to effect or cause the
registration of any Registrable Securities under the Securities Act as provided in this Agreement, the Company will, as expeditiously as reasonably practicable: 
 (i) prepare and file with the SEC a registration statement with respect to such Registrable Securities and use its reasonable best efforts
to cause such registration statement to become effective as soon as reasonably practicable; 
 (ii) prepare and file with the
SEC such amendments and supplements to such registration statement and the prospectus used in connection therewith as may be necessary to keep such registration statement effective for a period (A) in the case such registration statement is a
Shelf Registration Statement, ending on the earlier of the date that is two (2) years from the date of effectiveness of such Shelf Registration Statement (plus the aggregate number of days in all Suspension Periods, if any) or the date that the
securities registered under such Shelf Registration Statement cease being Registrable Securities, and (B) in the case of all other registration statements, not in excess of 180 days, and, in each case, to comply with the provisions of the
Securities Act, the Exchange Act and the rules and regulations of the SEC thereunder with respect to the disposition of all securities covered by such registration statement during such period in accordance with the intended methods of disposition
by the seller or sellers thereof set forth in such registration statement; provided that before filing a registration statement or prospectus, or any amendments or supplements thereto, the Company will furnish to each counsel selected
pursuant to Section 6.1 hereof by the Holders of the Registrable Securities covered by such registration statement to represent such Holders 

  

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and use all reasonable efforts to take into account and, if appropriate, reflect in such registration statement or amendment thereto such comments as the
Holders and their counsel may reasonably request; and provided, further, that notwithstanding the foregoing, with respect to any requested Shelf Registration Statement or other registration statement, the Company shall be entitled,
from time to time, by providing written notice to the Holders of Registrable Securities who elected to participate in such requested registration pursuant, to require such Holders of Registrable Securities to suspend the use of the prospectus
included therein for sales of Registrable Securities under the registration statement for a period of up to ninety (90) consecutive days (each a “Suspension Period”) if the Company shall determine that it is in possession of
material non-public information and the Board of Directors of the Company determines in good faith that disclosure of such information would not be in the best interests of the Company and its stockholders; provided that all Suspension
Periods that occur during any one-year period shall not exceed an aggregate of one hundred-twenty (120) days. 
 (iii)
furnish to each seller of such Registrable Securities such number of copies of such registration statement and of each amendment and supplement thereto, such number of copies of the prospectus included in such registration statement (including each
preliminary and final prospectus and supplement thereto), in conformity with the requirements of the Securities Act, and such other documents as such seller may reasonably request in order to facilitate the disposition of the Registrable Securities
by such seller; 
 (iv) use its reasonable best efforts to (A) register or qualify such Registrable Securities covered by
such registration in such jurisdictions as each seller shall reasonably request and to keep such registration or qualification in effect for so long as such registration statement remains in effect, and do any and all other acts and things which may
be reasonably necessary or advisable to enable such seller to consummate the disposition in such jurisdictions of the Registrable Securities owned by such seller, and (B) use its reasonable best efforts to cause such Registrable Securities
covered by such registration statement to be registered with or approved by such other governmental agencies or authorities as may be necessary to enable the seller or sellers thereof to consummate the disposition of such Registrable Securities;
provided, however, that the Company shall not for any such purpose be required to (I) qualify generally to do business as a foreign corporation in any jurisdiction where, but for the requirements of this clause (iv), it would not
be obligated to be so qualified, (II) subject itself to taxation in any such jurisdiction other than with respect to the registration of securities or (III) consent to general service of process in any such jurisdiction; 
 (v) notify each seller of any such Registrable Securities covered by such registration statement, at any time when a prospectus relating
thereto is required to be delivered under the Securities Act within the appropriate period mentioned in clause (ii) of this Section 3.1, of the Company’s becoming aware that the prospectus included in such registration statement, as
then in effect, includes an untrue statement of a material fact or omits to state a material fact required to be stated therein or necessary to make the statements therein not misleading in the light of the circumstances then existing, and at the
request of any such 

  

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seller, prepare as promptly as reasonably practical a post-effective amendment to such registration statement and furnish to such seller a reasonable number
of copies of an amended or supplemental prospectus as may be necessary so that, as thereafter delivered to the purchasers of such Registrable Securities, such prospectus shall not include an untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary to make the statements therein not misleading in the light of the circumstances then existing; 
 (vi) use its reasonable best efforts to comply with all applicable rules and regulations of the SEC, and make available to its security holders, as soon as reasonably practicable after the effective date of the
registration statement, an earnings statement which shall satisfy the provisions of Section 11(a) of the Securities Act and the rules and regulations promulgated thereunder; 
 (vii) procure, prior to the commencement of any customary “road show,” a rating for the Registrable Securities from each of
Standard & Poor’s Ratings Services (“S&P”) and Moody’s Investors Service, Inc. (“Moody’s”), and a corporate credit rating and a corporate family rating in respect of the Company from each
of S&P and Moody’s, respectively; 
 (viii) enter into and perform such customary agreements (including an
underwriting agreement in customary form), which may include indemnification provisions in favor of underwriters and other persons in addition to, or in substitution for the provisions of Article IV hereof, and take such other actions as sellers of
a majority of shares of such Registrable Securities or the underwriters, if any, reasonably request in order to expedite or facilitate the disposition of such Registrable Securities; 
 (ix) obtain a “cold comfort” letter or letters from the Company’s independent public accounts in customary form and
covering matters of the type customarily covered by “cold comfort” letters as the seller or sellers of a majority of principal amount of such Registrable Securities or managing underwriter or agent shall reasonably request; 
 (x) make available for inspection by any seller of such Registrable Securities covered by such registration statement, by any underwriter
participating in any disposition to be effected pursuant to such registration statement and by any attorney, accountant or other agent retained by any such seller or any such underwriter, all pertinent financial and other records, pertinent
corporate documents and properties of the Company, and cause all of the Company’s officers, directors and employees to supply all information reasonably requested by any such seller, underwriter, attorney, accountant or agent in connection with
such registration statement; 
 (xi) notify counsel (selected pursuant to Section 6.1 hereof) for the Holders of
Registrable Securities included in such registration statement and the managing underwriter or agent, as promptly as possible, and confirm the notice in writing if requested (A) when the registration statement, or any post-effective amendment
to the registration statement, shall have become effective, or any supplement to the prospectus or any amendment prospectus shall have been filed, (B) of the receipt 

  

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of any comments from the SEC, (C) of any request of the SEC to amend the registration statement or amend or supplement the prospectus or for additional
information and (D) of the issuance by the SEC of any stop order suspending the effectiveness of the registration statement or of any order preventing or suspending the use of any preliminary prospectus, or of the suspension of the
qualification of the registration statement for offering or sale in any jurisdiction, or of the institution or threatening of any proceedings for any of such purposes; 
 (xii) make every reasonable effort to prevent the issuance of any stop order suspending the effectiveness of the registration statement or
of any order preventing or suspending the use of any preliminary prospectus and, if any such order is issued, to obtain the withdrawal of any such order at the earliest possible moment; 
 (xiii) if requested by the managing underwriter or agent or any seller of Registrable Securities covered by the registration statement,
promptly incorporate in a prospectus supplement or post-effective amendment such information as the managing underwriter or agent or such Holder reasonably requests to be included therein and to which the Company does not reasonably object,
including, without limitation, with respect to the number of Registrable Securities being sold by such seller to such underwriter or agent, the purchase price being paid therefor by such underwriter or agent and with respect to any other terms of
the underwritten offering of the Registrable Securities to be sold in such offering; and make all required filings of such prospectus supplement or post-effective amendment as soon as practicable after being notified of the matters incorporated in
such prospectus supplement or post-effective amendment. The Company shall be entitled to reasonably delay any such filing in order to aggregate any such requests so as to reduce the need for multiple supplements or amendments and the Company shall
not be required to file more than one supplement or amendment in any thirty (30) day period; 
 (xiv) cooperate with the
sellers of Registrable Securities covered by the registration statement and the managing underwriter or agent, if any, to facilitate the timely preparation and delivery of certificates (not bearing any restrictive legends) representing securities to
be sold under the registration statement, and enable such securities to be in such denominations and registered in such names as the managing underwriter or agent, if any, or such sellers may request; 
 (xv) obtain for delivery to the sellers of Registrable Securities being registered and to the underwriters or agents an opinion or
opinions from counsel for the Company in customary form and in form, substance and scope reasonably satisfactory to such Holders, underwriters or agents and their counsel; 
 (xvi) cooperate with each seller of Registrable Securities and each underwriter or agent participating in the disposition of such
Registrable Securities and their respective counsel in connection with any filings required to be made with the NASD; 
  

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 (xvii) cause the Indenture to be qualified under the TIA not later than the effective
date of the applicable registration statement required by this Agreement, and, in connection therewith, cooperate with the Trustee and the holders of Notes to effect such changes to the Indenture as may be required for such Indenture to be so
qualified in accordance with the terms of the TIA; execute and use its reasonable best efforts to cause the Trustee thereunder to execute all documents that may be required to effect such changes and all other forms and documents required to be
filed with the SEC to enable such Indenture to be so qualified in a timely manner; and in the event that any such amendment or modification referred to in this clause (xvii) involves the appointment of a new trustee under the Indenture, the
Company shall appoint a new trustee thereunder pursuant to the applicable provisions of the Indenture; and 
 (xviii) if
requested by the underwriters, prepare and present to potential investors customary “road show” or marketing materials in a manner consistent with other new issuances of other securities similar to the Registrable Securities, provided,
however, that in no event shall management of the Company be required to participate in more than (a) one (1) customary “road show” of up to two days in connection with any registrations requested by the SLP Holders pursuant
to Section 2.1 (including any requested Marketed Take-Downs) and (b) one (1) customary “road show” of up to two days in connection with any registrations requested by the TPG Holders pursuant to Section 2.1 (including
any requested Marketed Take-Downs). 
 Each Holder of Registrable Securities agrees as a condition to the registration of such Holder’s
Registrable Securities as provided herein to furnish the Company with such information regarding such seller and pertinent to the disclosure requirements relating to the registration and the distribution of such securities as the Company may from
time to time reasonably request in writing. 
 Each Holder of Registrable Securities agrees that, upon receipt of any notice from the Company
of the happening of any event of the kind described in clause (v) of this Section 3.1, such Holder will forthwith discontinue disposition of Registrable Securities pursuant to the registration statement covering such Registrable Securities
until such Holder’s receipt of the copies of the supplemented or amended prospectus contemplated by clause (v) of this Section 3.1, and, if so directed by the Company, such Holder will deliver to the Company (at the Company’s
expense) all copies, other than permanent file copies then in such Holder’s possession, of the prospectus covering such Registrable Securities current at the time of receipt of such notice. In the event the Company shall give any such notice,
the period mentioned in clause (ii) of this Section 3.1 shall be extended by the number of days during the period from and including the date of the giving of such notice pursuant to clause (v) of this Section 3.1 and including
the date when each seller of Registrable Securities covered by such registration statement shall have received the copies of the supplemented or amended prospectus contemplated by clause (v) of this Section 3.1. 
 Section 3.2 Restrictions on Public Sale by the Company. The Company agrees (i) not to effect any public sale or distribution of any
securities similar to those being registered in accordance with Section 2.1(c) or Section 2.1(d), or any securities convertible into or exchangeable or exercisable for such securities, during such period as the lead underwriter may
reasonably request, 

  

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no greater than ninety (90) days, beginning on, the effective date of any registration statement relating to an offering under Section 2.1(c) or
the pricing of an offering under Section 2.1(d) (except as part of such registration statement), and (ii) that any agreement entered into after the date of this Agreement pursuant to which the Company issues or agrees to issue any
privately placed securities shall contain a provision under which holders of such securities agree not to effect any sale or distribution of such securities and not to effect any sale or distribution of such securities during the periods described
in (i) above, in each case including a sale pursuant to Rule 144 (except as part of any such registration, if permitted). Notwithstanding the foregoing, this Section 3.2 shall not apply to any sale or distribution of securities by the
Company the proceeds of which are to be used to redeem all of the Notes as soon as practicable after receipt of such proceeds. 
 ARTICLE IV

 INDEMNIFICATION 
 Section 4.1 Indemnification by the Company. In the event of any registration of any securities of the Company under the Securities Act pursuant to Article II hereof, the Company will, and it hereby does, indemnify and hold
harmless, to the extent permitted by law, the seller of any Registrable Securities covered by such registration statement, each affiliate of such seller and their respective trustees, directors and officers or general and limited partners (including
any director, officer, affiliate, employee, representative, agent and controlling Person of any of the foregoing), each other Person who participates as an underwriter in the offering or sale of such securities and each other Person, if any, who
controls such seller or any such underwriter within the meaning of the Securities Act (collectively, the “Indemnified Parties”), against any and all Actions (whether or not an Indemnified Party is a party thereto), losses, claims,
damages or liabilities, joint or several, and expenses (including, without limitation, reasonable attorney’s fees and reasonable expenses of investigation) to which such Indemnified Party may become subject under the Securities Act, common law
or otherwise, insofar as such losses, claims, damages, liabilities or expenses (or actions or proceedings in respect thereof, whether or not such Indemnified Party is a party thereto) arise out of, relate to or are based upon (a) any untrue
statement or alleged untrue statement of any material fact contained in any registration statement under which such securities were registered under the Securities Act, any preliminary, final or supplemental prospectus contained therein, or any
amendment or supplement thereto, or (b) any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein (in the case of a prospectus, in light of the circumstances
under which they were made) not misleading, and the Company will reimburse such Indemnified Party for any legal or any other expenses reasonably incurred by it in connection with investigating or defending against any such loss, claim, liability,
action or proceeding; provided that the Company shall not be liable to any Indemnified Party in any such case to the extent that any such loss, claim, damage, liability (or action or proceeding in respect thereof) or expense arises out of or is
based upon any untrue statement or alleged untrue statement or omission or alleged omission made in such registration statement or amendment or supplement thereto or in any such preliminary, final or supplemental prospectus in reliance upon and in
conformity with written information furnished to the Company through an instrument duly executed by such seller specifically stating that it is for use in the preparation thereof; provided, further, that the Company shall not be liable to any such
Indemnified Party in any such case to the extent that any such loss, claim, damages, liabilities or expenses arise from an offer 

  

 12 

 
or sale of Registrable Securities during a Suspension Period. Such indemnity shall remain in full force and effect regardless of any investigation made by or
on behalf of such seller or any Indemnified Party and shall survive the transfer of such securities by such seller. 
 Section 4.2 Indemnification by the Seller. Each seller of such Registrable Securities and each underwriter shall indemnify and hold harmless (in the same manner and to the same extent as set forth in Section 4.1) the
Company, its officers, directors and agents and all other prospective sellers with respect to any untrue statement or alleged untrue statement in or omission or alleged omission from such registration statement, any preliminary, final or
supplemental prospectus contained therein, or any amendment or supplement, if such untrue statement or alleged untrue statement or omission or alleged omission was made in reliance upon and in conformity with written information furnished to the
Company through an instrument duly executed by such seller or underwriter specifically stating that it is for use in the preparation of such registration statement, preliminary, final or supplemental prospectus or amendment or supplement, or a
document incorporated by reference into any of the foregoing. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of the Company or any of the prospective sellers, or any of their respective
affiliates, directors, officers or controlling Persons and shall survive the transfer of such securities by such seller. 
 Section 4.3 Notices of Claims, Etc. Promptly after receipt by an Indemnified Party hereunder of written notice of the commencement of any Action with respect to which a claim for indemnification may be made pursuant to this
Article IV, such Indemnified Party will, if a claim in respect thereof is to be made against an indemnifying party, give written notice to the latter of the commencement of such Action; provided that the failure of the Indemnified Party to
give notice as provided herein (i) shall not relieve the indemnifying party of its obligations under this Article IV, except to the extent that the indemnifying party is materially prejudiced by such failure to give notice, and (ii) shall
not, in any event, relieve the indemnifying party from any obligations which it may have to any Indemnified Party other than the indemnification obligation provided in Sections 4.1 and 4.2. In case any such Action is brought against an Indemnified
Party, unless in such Indemnified Party’s reasonable judgment a conflict of interest between such Indemnified Party and indemnifying parties may exist in respect of such Action, the indemnifying party will be entitled to participate in and to
assume the defense thereof (at its expense), jointly with any other indemnifying party similarly notified to the extent that it may wish, with counsel reasonably satisfactory to such Indemnified Party, and after notice from the indemnifying party to
such Indemnified Party of its election so to assume the defense thereof, the indemnifying party will not be liable to such Indemnified Party for any legal or other expenses subsequently incurred by the latter in connection with the defense thereof
other than reasonable costs of investigation. No indemnifying party will consent to entry of any judgment or settle any Action which (i) does not include, as an unconditional term thereof, the giving by the claimant or plaintiff to such
Indemnified Party of a release from all liability in respect of such Action and (ii) does not involve the imposition of equitable remedies or of any obligations on such Indemnified Party and does not otherwise adversely affect such Indemnified
Party, other than as a result of the imposition of financial obligations for such Indemnified Party will be indemnified hereunder. 
  

 13 

 Section 4.4 Contribution. 
 (a) If the indemnification provided for in this Article IV from the indemnifying party is unavailable to or insufficient to fully hold harmless an
Indemnified Party hereunder in respect of any Action, losses, damages, liabilities or expenses referred to herein, then the indemnifying party, in lieu of indemnifying such Indemnified Party, shall contribute to the amount paid or payable by such
Indemnified Party as a result of such Action, losses, damages, liabilities or expenses in such proportion as is appropriate to reflect the relative fault of the indemnifying party and such Indemnified Party in connection with the actions which
resulted in such Action losses, damages, liabilities or expenses, as well as any other relevant equitable considerations. The relative fault of such indemnifying party and such Indemnified Party shall be determined by reference to, among other
things, whether any action in question, including any untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact, has been made by, or relates to information supplied by, such indemnifying party or
Indemnified Parties, and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such action. The amount paid or payable by a party under this Section 4.4 as a result of the Action, losses,
damages, liabilities and expenses referred to above shall be deemed to include any legal or other fees or expenses reasonably incurred by such party in connection with any investigation or proceeding. 
 (b) The parties hereto agree that it would not be just and equitable if contribution pursuant to this Section 4.4 were determined by pro rata
allocation or by any other method of allocation which does not take account of the equitable considerations referred to in Section 4.4(a) hereof. No Person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the
Securities Act) shall be entitled to contribution from any Person who was not guilty of such fraudulent misrepresentation. 
 Section 4.5 Other Indemnification. Indemnification similar to that specified in the preceding provisions of this Article IV (with appropriate modifications) shall be given by the Company and each seller of Registrable
Securities with respect to any required registration or other qualification of securities under any federal or state law or regulation or governmental authority other than the Securities Act. 
 Section 4.6 Limitation on Liability. In no event shall the liability of any selling Holder of Registrable Securities under this Article
IV be greater in amount than the dollar amount of the gross proceeds after underwriting discounts and commissions, but before expenses, received by such Holder upon the sale of the Registrable Securities giving rise to such obligation. 

Section 4.7 Non-Exclusivity. The obligations of the parties under this Article IV shall be in addition to any liability which any
party may otherwise have to any other party. 
  

 14 

 ARTICLE V 
 RULE 144 
 Section 5.1 Rule 144. The Company covenants that it will use commercially
reasonable best efforts to file the reports required to be filed by it under the Securities Act and the Exchange Act (or, if the Company is not required to file such reports, it will, upon the request of any Holder, use commercially reasonable best
efforts to make publicly available such information), and it will take such further action as any Holder may reasonably request, all to the extent required from time to time to enable such Holder to sell Registrable Securities without registration
under the Securities Act within the limitation of the exemptions provided by (i) Rule 144 under the Securities Act, as such Rule may be amended from time to time, or (ii) any similar rule or regulation hereafter adopted by the SEC. Upon
the request of any Holder of Registrable Securities, the Company will deliver to such Holder a written statement as to whether it has complied with such requirements. 
 ARTICLE VI 
 SELECTION OF COUNSEL 
 Section 6.1 Selection of Counsel. In connection with any registration of Registrable Securities pursuant to Article II hereof, the
Holders of a majority of the Registrable Securities covered by any such registration may select one counsel to represent all Holders of Registrable Securities covered by such registration; provided, however, that in the event that the
counsel selected as provided above is also acting as counsel to the Company in connection with such registration, the remaining Holders shall be entitled to select one additional counsel to represent all such remaining Holders. 
 ARTICLE VII 
 MISCELLANEOUS 

Section 7.1 Amendments and Waivers. This Agreement may not be amended except by an instrument in writing signed on behalf of the
Company and the holders of a majority of the Registrable Securities held by the SLP Holders and the holders of a majority of the Registrable Securities held by the TPG Holders. Each holder of any Registrable Securities at the time or thereafter
outstanding shall be bound by any amendment authorized by this Section, whether or not such Registrable Securities shall have been marked to indicate such amendment. 
 Section 7.2 Successors, Assigns and Transferees. This Agreement shall be binding upon and shall inure to the benefit of the parties hereto and their respective successors and assigns. All or any
portion of the rights of each Holder under this Agreement are transferable to each transferee of such Holder to whom the transferor transfers Registrable Securities and each transferee of such Holder agrees to be bound by and to perform all of the
terms and provisions required by this Agreement. 
  

 15 

 Section 7.3 Confidentiality of Records. Each Holder agrees to use, and to use all
reasonable efforts to insure that its authorized representatives use, the same degree of care as such Holder uses to protect its own confidential information to keep confidential any information furnished to it pursuant to this Agreement which the
Company identifies as being confidential (so long as such information is not in the public domain); provided, however, that any Holder may disclose such confidential information without the prior written consent of the other parties
hereto (i) to any “Related Party” (as defined below) so long as such Related Party is advised of the confidentiality provisions of this Section 5.3 and agrees in writing to comply with such provisions, (ii) if such
information is publicly available or (iii) if disclosure is requested or compelled by legal proceedings, subpoena, civil investigative demands or similar proceedings. Any Holder who provides confidential information to a Related Party shall be
liable for any breach by such Related Party of the confidentiality provisions of this Section 7.3. For purposes of this Section 7.3, “Related Party” shall mean, with respect to any Holder, (A) any partner, member,
manager, director, officer, employee or representative of such Holder or (B) any affiliate of such Holder. 
 Section 7.4 Notices. All notices and other communications provided for hereunder shall be in writing and shall be sent by first class mail, fax or hand delivery: 
  

	 	(i)	if to the Company, to: 

 NetScout Systems,
Inc. 
 310 Litteton Road 
 Westferd, MA 01886 
 Attention: President and CEO 
 Fax: (978) 614-4039 
  

	 	(ii)	if to the SLP Entities, to: 

 c/o Silver
Lake Partners 
 2775 Sand Hill Road, Suite 100 
 Menlo Park, CA 94025 
 Attention: General Counsel 
 Fax: (650) 234-2502 
  

 16 

	 	(iii)	if to the TPG Entities, to: 

 c/o TPG
Capital 
 301 Commerce Street, Suite 3500 
 Fort Worth, TX 76102 
 Attention: John Viola 
 Fax: (817) 850-4023 
  

	 	(iv)	if to ICP, to: 

 Integral Capital Partners
VI, L.P. 
 3000 Sand Hill Road 
 Building 3, Suite 240 
 Menlo Park, California 94025 
 Attention: Pamela K. Hagenah 
 Fax: (650) 233-0366 
 All such notices and communications shall be deemed to have been given or made (A) when delivered by hand, (B) five (5) business days after being deposited in the mail, postage prepaid or (C) when faxed, receipt
acknowledged. 
 Section 7.5 Descriptive Headings. The headings in this Agreement are for convenience of reference only and
shall not limit or otherwise affect the meaning of terms contained herein. 
 Section 7.6 Severability. In the event that
any one or more of the provisions, paragraphs, words, clauses, phrases or sentences contained herein, or the application thereof in any circumstances, is held invalid, illegal or unenforceable in any respect for any reason, the validity, legality
and enforceability of any such provision, paragraph, word, clause, phrase or sentence in every other respect and of the remaining provisions, paragraphs, words, clauses, phrases or sentences hereof shall not be in any way impaired, it being intended
that all rights, powers and privileges of the parties hereto shall be enforceable to the fullest extent permitted by law. 
 Section 7.7 Counterparts. This Agreement may be executed in counterparts, and by different parties on separate counterparts, each of which shall be deemed an original, but all such counterparts shall together constitute one
and the same instrument. 
 Section 7.8 Governing Law. This Agreement shall be governed by and construed and enforced in
accordance with the laws of the State of New York. 
 Section 7.9 Termination. This Agreement shall terminate and be of no
further force and effect on the date on which the Company has redeemed all of the Notes in accordance with their terms. 
 Section 7.10 Guarantors. Each of the undersigned Guarantors agrees to be bound by all of the obligations of the Company under this Agreement. For the avoidance of doubt, such obligations shall include, but not be limited
to, the obligations enumerated in Sections 2.4, 4.1 and 4.3 hereof. 
 [Signatures on following pages.] 
  

 17 

 IN WITNESS WHEREOF, each of the undersigned has executed this Agreement or caused this Agreement to be
duly executed on its behalf as of the date first written above. 
  

			
	NETSCOUT SYSTEMS, INC.
		
	By:	 	 /s/ David P. Sommers

	Name:	 	David P. Sommers
	Title:	 	Chief Financial Officer and
		 	Senior Vice-President, General
		 	Operations
	
	 NETSCOUT SYSTEMS SECURITY CORPORATION,
 as a Guarantor

		
	By:	 	 /s/ David P. Sommers

	Name:	 	David P. Sommers
	Title:	 	President
	
	 NETSCOUT SERVICE LEVEL CORPORATION,
 as a Guarantor

		
	By:	 	 /s/ David P. Sommers

	Name:	 	David P. Sommers
	Title:	 	President

			
	 NETWORK GENERAL CENTRAL CORPORATION,
 as a Guarantor

		
	By:	 	 /s/ David P. Sommers

	Name:	 	David P. Sommers
	Title:	 	Treasurer
	
	 NETWORK GENERAL CORPORATION,
 as
a Guarantor

		
	By:	 	 /s/ David P. Sommers

	Name:	 	David P. Sommers
	Title:	 	Treasurer
	
	 FIDELIA TECHNOLOGY, INC. ,
 as a
Guarantor

		
	By:	 	 /s/ David P. Sommers

	Name:	 	David P. Sommers
	Title:	 	President
	
	NETWORK GENERAL INTERNATIONAL CORPORATION,
	as a Guarantor
		
	By:	 	 /s/ David P. Sommers

	Name:	 	David P. Sommers
	Title:	 	President
	
	 STARBURST TECHNOLOGY HOLDINGS I, LLC,
 as a Guarantor

		
	By:	 	 /s/ David P. Sommers

	Name:	 	David P. Sommers
	Title:	 	President

			
	STARBURST TECHNOLOGY HOLDINGS II, LLC,
	as a Guarantor
		
	By:	 	 /s/ David P. Sommers

	Name:	 	David P. Sommers
	Title:	 	President

  

 21 

			
	INTEGRAL CAPITAL PARTNERS VI, L.P.
		
	By:	 	Integral Capital Management VI, L.L.C.,
		 	its General Partner
		
	By:	 	 /s/ Pamela K. Hagenah

	Name:	 	Pamela K. Hagenah
	Title:	 	Manager

  

 22 

			
	SILVER LAKE PARTNERS, L.P.
		
	By:	 	Silver Lake Technology Associates, L.L.C.
		 	its General Partner
		
	By:	 	Silver Lake Group, L.L.C.
		 	its Managing Member
		
	By:	 	 /s/ Jim Davidson

	Name:	 	Jim Davidson
	Title:	 	Managing Director
	
	SILVER LAKE INVESTORS, L.P.
		
	By:	 	Silver Lake Technology Associates, L.L.C.
		 	its General Partner
		
	By:	 	Silver Lake Group, L.L.C.
		 	its Managing Member
		
	By:	 	 /s/ Jim Davidson

	Name:	 	Jim Davidson
	Title:	 	Managing Director
	
	SILVER LAKE TECHNOLOGY INVESTORS, L.L.C.
		
	By:	 	Silver Lake Technology Management, L.L.C.,
		 	its Manager
		
	By:	 	 /s/ Jim Davidson

	Name:	 	Jim Davidson
	Title:	 	Managing Director

 [Signature page to Registration Rights Agreement] 

			
	TPG STARBURST IV, LLC
		
	By:	 	TPG Partners IV, L.P.,
		 	its Manager
		
	By:	 	TPG GenPar IV, L.P.,
		 	its General Partner
		
	By:	 	TPG Advisors IV, Inc.,
		 	its General Partner
		
	By:	 	 /s/ Bryan Taylor

	Name:	 	Bryan Taylor
	Title:	 	Partner
	
	TPG STARBURST III, LLC
		
	By:	 	TPG Partners III, L.P.,
		 	its Manager
		
	By:	 	TPG GenPar III, L.P.,
		 	its General Partner
		
	By:	 	TPG Advisors III, Inc.,
		 	its General Partner
		
	By:	 	 /s/ Bryan Taylor

	Name:	 	Bryan Taylor
	Title:	 	Partner

			
	T3 STARBURST II, LLC
		
	By:	 	T3 Partners II, L.P.,
		 	its Manager
		
	By:	 	T3 Gen Par II, L.P.,
		 	its General Partner
		
	By:	 	T3 Advisors II, Inc.
		 	its General Partner
		
	By:	 	 /s/ Bryan Taylor

	Name:	 	Bryan Taylor
	Title:	 	PartnerLOAN MODIFICATION AGREEMENT

 Exhibit 10.1 
 LOAN MODIFICATION AGREEMENT 
 This Loan Modification Agreement (this “Loan Modification
Agreement”) is dated as of November 1, 2007, by and between SILICON VALLEY BANK, a California corporation, with its principal place of business at 3003 Tasman Drive, Santa Clara, California 95054 and with a loan production
office located at One Newton Executive Park, Suite 200, 2221 Washington Street, Newton, Massachusetts 02462 (“Bank”) and NETSCOUT SYSTEMS, INC., a Delaware corporation with offices at 310 Littleton Road, Westford, Massachusetts
01886-4105 (“Borrower”). 
 1. DESCRIPTION OF EXISTING INDEBTEDNESS AND OBLIGATIONS. Among other indebtedness and obligations which may be
owing by Borrower to Bank, Borrower is indebted to Bank pursuant to a certain loan arrangement dated as of March 12, 1998, evidenced by, among other documents, a certain Amended and Restated Loan and Security Agreement dated as of
March 12, 1998 between Borrower and Bank, as amended by certain Loan Modification Agreements between Borrower and Bank dated March 11, 1999, March 10, 2000, June 27, 2000, March 9, 2001, August 14,
2001, September 7, 2001, March 10, 2002, November 7, 2002, March 19, 2003, dated as of July 31, 2003, effective as of June 8, 2003, June 8, 2004, June 9, 2005, and dated as of
July 20, 2007, and effective as of June 5, 2007 (as may be amended from time to time, the “Loan Agreement”). Capitalized terms used but not otherwise defined herein shall have the same meaning as in the Loan Agreement.

 Hereinafter, all indebtedness and obligations owing by Borrower to Bank shall be referred to as the “Obligations”. 

2. DESCRIPTION OF COLLATERAL. Repayment of the Obligations is secured by the Collateral as described in the Loan Agreement, as modified hereby (the
“Security Documents”). 
 Hereinafter, the Security Documents, together with all other documents evidencing or securing the Obligations shall be
referred to as the “Existing Loan Documents”. 
 3. DESCRIPTION OF CHANGE IN TERMS. 
 A. Modifications to Loan Agreement. 
  

	 	1.	The Loan Agreement shall be amended by deleting the following Section 2.1.2 entitled “Letters of Credit Sublimit” in its entirety: 

 “2.1.2 Letters of Credit Sublimit. If there is availability for Credit Extensions under Section 2.1.1(a), Bank shall issue or have
issued Letters of Credit for Borrower’s account not exceeding (i) the Committed Revolving Line, minus (ii) the outstanding principal balance of any Advances (including any Cash Management Services), minus (iii) the FX Reserve,
minus (iv) the amount of all Letters of Credit (including drawn but unreimbursed Letters of Credit). The face amount of outstanding Letters of Credit (including drawn but unreimbursed Letters of Credit) may not exceed Ten Million Dollars
($10,000,000.00). Each Letter of Credit shall be secured by cash on terms acceptable to Bank on and after (i) the Revolving Maturity Date if the term of the Committed Revolving Line is not extended by Bank, or (ii) the occurrence of an
Event of 

 
Default hereunder. All Letters of Credit shall be, in form and substance, acceptable to Bank in its sole discretion and shall be subject to the terms and
conditions of Bank’s form of standard Application and Letter of Credit Agreement. Borrower agrees to execute any further documentation in connection with the Letters of Credit as Bank may reasonably request. The obligation of Borrower to
immediately reimburse Bank for drawings made under Letters of Credit shall be absolute, unconditional and irrevocable, and shall be performed strictly in accordance with the terms of this Agreement and such Letters of Credit, under all circumstances
whatsoever.” 
 and inserting in lieu thereof the following: 
 “2.1.2 Letters of Credit Sublimit. If there is availability for Credit Extensions under Section 2.1.1(a), Bank shall issue or have
issued Letters of Credit for Borrower’s account not exceeding (i) the Committed Revolving Line, minus (ii) the outstanding principal balance of any Advances (including any Cash Management Services), minus (iii) the FX Reserve,
minus (iv) the amount of all Letters of Credit (including drawn but unreimbursed Letters of Credit). The face amount of outstanding Letters of Credit (including drawn but unreimbursed Letters of Credit) may not exceed Five Million Dollars
($5,000,000.00). Each Letter of Credit shall be secured by cash on terms acceptable to Bank on and after (i) the Revolving Maturity Date if the term of the Committed Revolving Line is not extended by Bank, or (ii) the occurrence of an
Event of Default hereunder. All Letters of Credit shall be, in form and substance, acceptable to Bank in its sole discretion and shall be subject to the terms and conditions of Bank’s form of standard Application and Letter of Credit Agreement.
Borrower agrees to execute any further documentation in connection with the Letters of Credit as Bank may reasonably request. The obligation of Borrower to immediately reimburse Bank for drawings made under Letters of Credit shall be absolute,
unconditional and irrevocable, and shall be performed strictly in accordance with the terms of this Agreement and such Letters of Credit, under all circumstances whatsoever.” 
  

	 	2.	The Loan Agreement shall be amended by deleting the following Section 2.1.3 entitled “Cash Management Service Sublimit” in its entirety: 

 “2.1.3 Cash Management Services Sublimit. Borrower may use up to Ten Million Dollars ($10,000,000.00) for the Bank’s Cash Management
Services (the “Cash Management Services Sublimit”), which may include merchant services, direct deposit of payroll, business credit card, and PC-ACH services identified in various cash management services agreements related to such Cash
Management Services (the “Cash Management Services”). Such aggregate amounts utilized under the Cash Management Services Sublimit shall at all times reduce the amount otherwise available for Credit Extensions under the Committed Revolving
Line. Any amounts Bank pays on behalf of Borrower or any amounts that are not paid by Borrower for any Cash Management Services will be treated as Advances under the Committed Revolving Line and will accrue interest at the interest rate applicable
to Advances.” 

 and inserting in lieu thereof the following: 
 “2.1.3 Cash Management Services Sublimit. Borrower may use up to Five Million Dollars ($5,000,000.00) for the Bank’s Cash Management
Services (the “Cash Management Services Sublimit”), which may include merchant services, direct deposit of payroll, business credit card, and PC-ACH services identified in various cash management services agreements related to such Cash
Management Services (the “Cash Management Services”). Such aggregate amounts utilized under the Cash Management Services Sublimit shall at all times reduce the amount otherwise available for Credit Extensions under the Committed Revolving
Line. Any amounts Bank pays on behalf of Borrower or any amounts that are not paid by Borrower for any Cash Management Services will be treated as Advances under the Committed Revolving Line and will accrue interest at the interest rate applicable
to Advances.” 
  

	 	3.	The Loan Agreement shall be amended by deleting the following Section 2.1.4 entitled “Foreign Exchange Sublimit” in its entirety: 

 “2.1.4 Foreign Exchange Sublimit. If there is availability for Credit Extensions under Section 2.1.1(a), then Borrower may enter into
foreign exchange forward contracts with the Bank under which Borrower commits to purchase from or sell to Bank a set amount of foreign currency more than one business day after the contract date (the “FX Forward Contract”). Bank shall
subtract 10% of each outstanding FX Forward Contract (the “FX Reserve”) from the foreign exchange sublimit, which sublimit is a maximum of Ten Million Dollars ($10,000,000.00). The total FX Forward Contracts at any one time may not exceed
10 times the amount of the FX Reserve. Bank may terminate the FX Forward Contracts if an Event of Default occurs.” 
 and inserting in
lieu thereof the following: 
 “2.1.4 Foreign Exchange Sublimit. If there is availability for Credit Extensions under
Section 2.1.1(a), then Borrower may enter into foreign exchange forward contracts with the Bank under which Borrower commits to purchase from or sell to Bank a set amount of foreign currency more than one business day after the contract date
(the “FX Forward Contract”). Bank shall subtract 10% of each outstanding FX Forward Contract (the “FX Reserve”) from the foreign exchange sublimit, which sublimit is a maximum of Five Million Dollars ($5,000,000.00). The total FX
Forward Contracts at any one time may not exceed 10 times the amount of the FX Reserve. Bank may terminate the FX Forward Contracts if an Event of Default occurs.” 

	 	4.	The Loan Agreement shall be amended by deleting Section 6.6 entitled “Primary Accounts” and inserting the following new Section 6.6 entitled “Accounts”
in lieu thereof: 

 “6.6 Operating Accounts. 
 (a) Maintain its primary depository, and operating accounts with Bank. 
 (b) Provide Bank five (5) days prior written notice before establishing any Collateral Account at or with any bank or financial
institution other than Bank or its Affiliates. In addition, for each Collateral Account that Borrower at any time maintains, Borrower shall cause the applicable bank or financial institution (other than Bank) at or with which any Collateral Account
is maintained to execute and deliver a Control Agreement or other appropriate instrument with respect to such Collateral Account to perfect Bank’s Lien in such Collateral Account in accordance with the terms hereunder, which Control Agreement
may not be terminated without the prior written consent of the Bank. The provisions of the previous sentence shall not apply to deposit accounts exclusively used for payroll, payroll taxes and other employee wage and benefit payments to or for the
benefit of Borrower’s employees and identified to Bank by Borrower as such. The provisions of this Section 6 will not apply to accounts of Borrower maintained with: (i) financial institutions outside of the United States, and
(ii) Chase Manhattan/Kaufman Brothers which funds shall be used solely for the purpose of treasury stock re-purchases.” 
  

	 	5.	The Loan Agreement shall be amended by deleting Section 6.7 entitled “Financial Covenants” in its entirety, and inserting in lieu thereof the following:

 “6.7 Financial Covenants. Borrower shall maintain at all times, to be tested as of the last day of each month,
unless otherwise noted: 
 (a) Liquidity. Beginning with the month ending September 30, 2007, and as of the last
day of each month thereafter, Borrower shall maintain Liquid Assets in an amount equal to two (2) times the outstanding principal amount of the Obligations of Borrower to the Bank, at any time. As used herein “Liquid Assets” shall
mean all unrestricted and unencumbered (without the written consent of Bank) cash, Cash Equivalents, and marketable securities maintained at Bank or SVB Securities (provided a control agreement is in place) in Borrower’s name and not pledged to
any other Person (without the written consent of Bank).” 
  

	 	6.	The Loan Agreement shall be amended by deleting the following definitions appearing in Section 13.1 thereof: 

 ““Accounts” are all existing and later arising accounts, contract rights, and
other obligations owed to the Borrower in connection with its sale or lease of goods (including licensing software and other technology) or provision of services, all credit insurance, guaranties, other security and all merchandise returned or
reclaimed by the Borrower and the Borrower’s books and records relating to any of the foregoing. 
 “Committed Revolving
Line” means an Advance of up to $10,000,000.00. 
 and inserting in lieu thereof the following: 
 ““Accounts” are all accounts as defined under the UCC, including all existing and later arising accounts, contract rights, payment
intangibles, and other obligations owed to the Borrower in connection with its sale or lease of goods (including licensing software and other technology) or provision of services, all credit insurance, guaranties, other security and all merchandise
returned or reclaimed by the Borrower and the Borrower’s books and records relating to any of the foregoing. 
 “Committed
Revolving Line” means an Advance of up to $5,000,000.00.” 
  

	 	7.	The Loan Agreement shall be amended by inserting the following definitions to appear alphabetically in Section 13.1 thereof: 

 “Cash Equivalents” means (i) marketable direct obligations issued or unconditionally guaranteed by the United States or any agency
or any State thereof having maturities of not more than one (1) year from the date of acquisition; (ii) commercial paper maturing no more than one (1) year after its creation and having the highest rating from either Standard &
Poor’s Ratings Group or Moody’s Investors Service, Inc.; (iii) certificates of deposit issued maturing no more than one (1) year after issue; and (iv) money market funds at least ninety-five percent (95%) of the assets
of which constitute Cash Equivalents of the kinds described in clauses (i) through (iii) of this definition. 
 “Collateral
Account” is any Deposit Account or Securities Account. 
 “Control Agreement” is any control agreement entered into
among the depository institution at which Borrower maintains a Deposit Account or the securities intermediary or commodity intermediary at which Borrower maintains a Securities Account, Borrower, and Bank pursuant to which Bank obtains control
(within the meaning of the Code) over such Deposit Account or Securities Account. 
 “Deposit Account” shall have the
meaning supplied to it in Section 9- 102 of the Uniform Commercial Code. 

 “Investment Property” shall have the meaning ascribed to it in Section 9-102 of the
Uniform Commercial Code, provided that Investment Property shall not include equity interests in direct or indirect subsidiaries of Borrower. 
 “Proceeds” shall have the meaning ascribed to it in Section 9-102 of the Uniform Commercial Code. 
 “Securities Account” shall have the meaning ascribed to it in Section 8- 501 of the Uniform Commercial Code.” 
  

	 	8.	The Collateral description attached as Exhibit A to the Loan Agreement is hereby replaced with the Collateral description attached as Exhibit A hereto.

  

	 	9.	The Compliance Certificate attached as Exhibit C to the Loan Agreement is hereby replaced with the Compliance Certificate attached as Exhibit B hereto.

 4. FEES. Borrower shall pay to Bank a modification fee equal to Two Thousand Five Hundred Dollars ($2,500.00), which fee shall be due
on the date hereof and shall be deemed fully earned as of the date hereof. Borrower shall also reimburse Bank for all legal fees and expenses incurred in connection with this amendment to the Existing Loan Documents. 
 5. CONSISTENT CHANGES. The Existing Loan Documents are hereby amended wherever necessary to reflect the changes described above. 
 6. RATIFICATION OF LOAN DOCUMENTS. Borrower hereby ratifies, confirms, and reaffirms all terms and conditions of all security or other collateral granted to the
Bank, and confirms that the indebtedness secured thereby includes, without limitation, the Obligations. 
 7. NO DEFENSES OF BORROWER. Borrower hereby
acknowledges and agrees that Borrower has no offsets, defenses, claims, or counterclaims against Bank with respect to the Obligations, or otherwise, and that if Borrower now has, or ever did have, any offsets, defenses, claims, or counterclaims
against Bank, whether known or unknown, at law or in equity, all of them are hereby expressly WAIVED and Borrower hereby RELEASES Bank from any liability thereunder. 
 8. CONTINUING VALIDITY. Borrower understands and agrees that in modifying the existing Obligations, Bank is relying upon Borrower’s representations, warranties, and agreements, as set forth in the Existing
Loan Documents. Except as expressly modified pursuant to this Loan Modification Agreement, the terms of the Existing Loan Documents remain unchanged and in full force and effect. Bank’s agreement to modifications to the existing Obligations
pursuant to this Loan Modification Agreement in no way shall obligate Bank to make any future modifications to the Obligations. Nothing in this Loan Modification Agreement shall constitute a satisfaction of the Obligations. It is the intention of
Bank and Borrower to retain as liable parties all makers of Existing Loan Documents, unless the party is expressly released by Bank in writing. No maker will be released by virtue of this Loan Modification Agreement. 
 9. COUNTERSIGNATURE. This Loan Modification Agreement shall become effective only when it shall have been executed by Borrower and Bank. 

 10. CONSENT TO ISSUANCE OF SENIOR SECURED FLOATING RATE NOTES. Bank hereby consents (thereby waiving the
restrictive covenants set forth in the Loan Agreement) to (i) the issuance by Borrower of Borrower’s Senior Secured Floating Rate Notes due 2012 (the “Borrower Notes”) pursuant to an indenture with Wells Fargo Bank, National
Association, as collateral agent (the “Note Collateral Agent”), on behalf of the holders of the Borrower Notes, as may be amended from time to time (the “Borrower Indenture”), (ii) the lien and security interest created by
the Security Agreement (as defined in the Borrower Indenture) on substantially all of Borrower’s real and personal property and the real and personal property of Borrower’s domestic subsidiaries, and (iii) the guaranty of the Borrower
Notes by Borrower’s domestic subsidiaries, and agrees that the foregoing shall not constitute an “Event of Default” under the Loan Agreement. 

 This Loan Modification Agreement is executed as a sealed instrument under the laws of the Commonwealth of
Massachusetts as of the date first written above. 
  

									
	BORROWER:	 		 	BANK:
			
	NETSCOUT SYSTEMS, INC.	 		 	SILICON VALLEY BANK
					
	By:	 	 /s/ David P. Sommers
	 		 	By:	 	 /s/ Robin Gill

	Name:	 	David P. Sommers	 		 	Name:	 	Robin Gill
	Title:	 	Chief Financial Officer and	 		 	Title:	 	Vice President
		 	Senior Vice-President, General Operations	 		 		 	

 EXHIBIT A 
 The Collateral consists of all of Borrower’s right, title and interest in and to the following personal property: 
 All
Accounts, cash, Cash Equivalents, Deposit Accounts, Investment Property, and Securities Accounts, whether now owned or hereafter acquired, wherever located and all Proceeds and insurance proceeds of any or all of the foregoing. 

 THE FOLLOWING EXHIBIT TO THE LOAN MODIFICATION AGREEMENT HAS BEEN OMITTED IN ACCORDANCE WITH ITEM 601(B)(2) OF
REGULATION S-K. 
  

			
	Exhibit B	  	Compliance Certificate

 NetScout Systems, Inc. will furnish supplementally a copy of the omitted exhibit to the Securities and Exchange
Commission upon request, provided however that NetScout Systems, Inc. may request confidential treatment pursuant to Rule 24b-2 of the Securities and Exchange Act of 1934, as amended for the exhibit so furnished.

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