Sophisticated, Self-learning Analysis Technology Enables Intelligent, Timely Diagnosis of Application and Network Performance Problems

WESTFORD, Mass., July 26, 2006 – NetScout Systems, Inc. (NASDAQ: NTCT), a leading provider of application and network performance management solutions, today announced that the U.S. Patent and Trademark Office has granted the company a patent for a system that analyzes a data stream for abnormalities in real time, which is a key technology underpinning NetScout’s nGenius Analytics product.

The patented technology, which came with NetScout’s acquisition of Quantiva in 2005, provides nGenius Analytics the unique capability to automatically detect traffic flow anomalies and identify the applications causing them for the purposes of proactive performance management. nGenius Analytics identifies emerging problems in large networks and sends alerts to IT managers along with context, so they can fix performance problems earlier, reducing the impact on business services.

“This patent demonstrates NetScout’s technology depth in advanced performance management. We are working to automate both proactive monitoring and fault isolation to empower our users to cope with the challenges of a faster, highly distributed, and increasingly virtualized application and infrastructure environment,” said Michael Szabados, senior vice president of product operations at NetScout. “NetScout’s Application Fabric Performance Management strategy builds on these new achievements in analysis technology, as well as on real-world customer experience, to help our users shorten the mean time to repair in their operations departments.”

NetScout’s approach minimizes false positive alerts by using probability distribution mapping, which is more sophisticated than other analysis methods based on simple deviations-from-norm or moving averages.

Additionally, the patented technology uses multiple sliding ‘analysis windows’ for analyzing application flow data, to more effectively detect a wider set of anomalies beyond a simple spike. For example, nGenius Analytics can catch a gradual increase or upward ‘drift’ in bandwidth consumption by an application that could indicate an emerging but serious problem that has not yet come to the attention of IT staff. The newly patented technology also utilizes self-learning capabilities which eliminates lengthy and error-prone manual configuration or training of an analysis system.

The patent, number 7,031,884 B1, was granted to NetScout employees Ron Hiller and Amin Abdulghani, as well as key contributing consultant Dragan Radulovic.

About NetScout Systems
NetScout Systems, Inc. (NASDAQ: NTCT) is a market leader and pioneer of integrated application and network performance management products and solutions that help IT organizations assure critical business services across the enterprise. More than 3000 leading companies and government organizations worldwide have deployed NetScout's nGenius® Performance Management System to 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.

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NetScout and the NetScout logo, nGenius, and Quantiva are registered trademarks of NetScout Systems, Inc. The CDM logo, MasterCare, Progressive Analytics 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.

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