LOAN MODIFICATION AGREEMENT
This Loan Modification Agreement (this "Loan Modification Agreement") is entered into as of March 10, 2002,
by and between SILICON VALLEY BANK, a California-chartered bank, 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, doing business under the
name "Silicon Valley East" ("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 and September 7, 2001 (as may be amended from time
to time, the "Loan Agreement"). The Loan Agreement established a working capital line of credit in favor of
Borrower in the maximum principal amount of Ten Million Dollars ($10,000,000.00) (the "Committed Revolving
Line"). Capitalized terms used but not otherwise defined herein shall have the same meaning as in the Loan
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 (together with any other collateral security granted to Bank, the "Security Documents").
Hereinafter, the Security Documents, together with all other documents evidencing or securing the Obligations
shall be referred