Exhibit 99.1

               NETSCOUT SYSTEMS COMPLETES ACQUISITION OF QUANTIVA

        Combination Adds Advanced Analytics for Automating the Process of
    Detecting and Diagnosing Application Performance Issues across Converged
                                    Networks

WESTFORD, Mass., April 14 /PRNewswire-FirstCall/ -- NetScout Systems, Inc.
(Nasdaq: NTCT), a leading provider of enterprise-wide network and application
performance management products and solutions, today announced that it has
completed the acquisition of the business and assets of privately held Quantiva
Inc., a provider of automated analytics solutions for application performance
management. Under the terms of the agreement, the purchase price totaled
approximately $9.3 million and was paid in cash.

The acquisition of Quantiva will extend NetScout's leading market position with
unique technology that automates the process of detecting and diagnosing
application performance problems before they impact critical business services.
"Recent events of consolidation in our industry have validated how important
network-centric infrastructure performance management is in the marketplace
today. NetScout's ability to provide advanced application visibility is one of
our competitive strengths," said Anil Singhal, president and CEO of NetScout
Systems. "As we integrate Quantiva's innovative analytics with our nGenius
solution, we will deliver an automated system for identifying and diagnosing
performance anomalies that will enhance NetScout's leadership in networked
application performance management."

Quantiva's patent-pending technology uses real time performance metrics to
establish statistically expected behavior values using advanced modeling and
analytics. When a measurement such as the response time of a critical business
application or jitter in a Voice-over-IP call is recognized as being outside of
the normal range, Quantiva's software automatically performs diagnostic analysis
to determine the likely cause. The final outcome is fewer, more reliable alarms,
accompanied by actionable diagnostic results, increasing IT productivity, and
improving business service dependability and responsiveness.

"Quantiva's technology provides a top-down approach to identifying and
qualifying anomalies affecting service performance so that problem resolution is
automated from the business service transaction downwards, across the
infrastructure. This provides a structural guarantee that anomalies will not be
analyzed, or even worse, presented to IT professionals for review unless they
are clearly aligned with a service performance issue," said Dennis Drogseth,
vice president, Enterprise Management Associates. "With Quantiva's acquisition,
NetScout has the potential to significantly enhance its industry position and
market outreach in this consolidating market."



"The Quantiva acquisition is an important milestone in NetScout's strategic
direction toward automated performance management," said Mr. Singhal, "and it
will give us significant time-to-market acceleration along that path."

About NetScout Systems, Inc.

NetScout Systems, Inc. (Nasdaq: NTCT) is a market leader and pioneer of
integrated network and application performance management products and solutions
that unify performance across the enterprise. NetScout's nGenius Performance
Management System is helping more than 3000 leading companies increase their
return on infrastructure investments by optimizing the performance of networks
and applications according to business priorities. NetScout is headquartered in
Westford, Massachusetts and has offices worldwide. Further information is
available at http://www.netscout.com.

NetScout and the NetScout logo, nGenius, and Quantiva are registered trademarks
of NetScout Systems, Inc. The CDM logo, MasterCare and the MasterCare logo, are
trademarks of NetScout Systems, Inc. Other brands, product names and trademarks
are property of their respective owners. NetScout reserves the right, at its
sole discretion, to make changes at any time in its technical information and
specifications, and service and support programs.

Safe Harbor:

Forward-looking statements in this release are made pursuant to the safe harbor
provisions of Section 21E of the Securities Exchange Act of 1934. Investors are
cautioned that statements in this press release, which are not strictly
historical statements, including statements concerning the expected effects of
the acquisition, expected synergies and product offerings resulting from the
acquisition and the plans, objectives and future financial performance of
NetScout, constitute forward-looking statements which involve risks and
uncertainties. Actual results could differ materially from the forward-looking
statements. Risks and uncertainties which could cause actual results to differ
include, without limitation, risks and uncertainties associated with the
Company's ability to integrate the acquisition successfully, costs associated
with the acquisition, the ability to achieve market introduction and acceptance
of new products from the acquisition, difficulties in managing geographically
dispersed operations, and other factors relating to acquisitions generally, as
well as the Company's relationships with strategic partners, dependence upon
broad-based acceptance of the Company's network performance management
solutions, the Company's ability to achieve and maintain a high rate of growth,
introduction and market acceptance of new products and product enhancements such
as the delivery of nGenius product platform probes and software solutions and
the implementation of the Company's CDM Technology strategy, the ability of the
Company to take advantage of service provider opportunities, competitive pricing
pressures, reliance on sole source suppliers, successful expansion and
management of direct and indirect distribution channels and dependence on
proprietary technology, as well as risks associated with a continued climate of
tight IT spending, and risks of further slowdowns or downturns in economic
conditions generally and in the market for network performance management
solutions specifically. For a more detailed description of the risk factors
associated with the Company, please refer to the Company's Annual Report on Form
10-K for the fiscal year ended March 31, 2004 and its quarterly report on Form
10-Q for the quarter ended December 31, 2004 on file with the Securities and
Exchange Commission. NetScout assumes no obligation to update any
forward-looking information contained in this press release or with respect to
the announcements described herein.

     For Further Information:
     Catherine Taylor
     Director of Investor Relations
     NetScout Systems, Inc.
     978-614-4286
     IR@netscout.com

SOURCE  NetScout Systems, Inc.
    -0-                             04/14/2005
    /CONTACT: Catherine Taylor, Director of Investor Relations of NetScout
Systems, Inc., +1-978-614-4286, IR@netscout.com/
    /Web site:  http://www.netscout.com/