Limited POWER OF ATTORNEY

        The undersigned hereby constitutes and appoints each of David P.
Sommers, Jeff Levinson, and Deborah Asinas, signing individually, the
undersigned's true and lawful attorneys-in fact and agents to:

                (1)     execute for and on behalf of the undersigned, an
        officer, director or holder of 10% of more of a registered class of
        securities of NetScout Systems, Inc. (the "Company"), Forms 3, 4 and 5
        in accordance with Section 16(a) of the Securities Exchange Act of 1934,
        as amended (the "Exchange Act") and the rules thereunder;

                (2)     do and perform any and all acts for and on behalf of the
        undersigned that may be necessary or desirable to complete and execute
        such Form 3, 4 or 5, complete and execute any amendment or amendments
        thereto, and timely file such forms or amendments with the United States
        Securities and Exchange Commission and any stock exchange or similar
        authority; and

                (3)     take any other action whatsoever in connection with the
        foregoing which, in the opinion of such attorney-in-fact, may be of
        benefit, in the best interest of, or legally required by, the
        undersigned, it being understood that the documents executed by such
        attorney-in-fact on behalf of the undersigned pursuant to this Power of
        Attorney shall be in such form and shall contain such terms and
        conditions as such attorney-in-fact may approve.

        The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act required, necessary, or proper
to be done in the exercise of the rights and powers herein granted, as fully to
all intents and purposes as the undersigned might or could do if personally
present, with full power of substitution or revocation, hereby ratifying and
confirming all that such attorney-in-fact, or such attorney-in-fact's substitute
or substitutes, shall lawfully do or cause to be done by virtue of this power of
attorney and the rights and powers herein granted. The undersigned acknowledges
that the foregoing attorneys-in-fact, in serving in such capacity at the request
of the undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Exchange Act.

        This Power of Attorney shall remain in full force and effect until the
earliest to occur of (a) the undersigned is no longer required to file Forms 3,
4 and 5 with respect to the undersigned's holdings of and transactions in
securities issued by the Company, (b) revocation by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact or (c) as to any
attorney-in-fact individually, until such attorney-in-fact shall no longer be
employed by the Company.

        IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 20th day of January, 2010.

                                        /s/ Jeffrey R. Wakely
                                        ----------------------------------------
                                        Name: Jeffrey R. Wakely