Company's Innovative Approach to Improving Network Availability Hailed as Efficient and Elegant


WALTHAM, Mass., April 23, 2001-- Arbor Networks, a provider of managed availability services, today announced it has been named to the Red Herring "Ten to Watch" and the Network World "Ten Start-Ups to Watch in 2001." Launched in February 2001, Arbor offers a distributed, non-intrusive, carrier-class service that proactively detects, traces, and filters threats to network availability, such as denial of service attacks. The company has received $11 million in Series A financing from two blue chip funding partners, Battery Ventures and Cisco Systems, Inc.

"Solutions designed for the enterprise environment cannot effectively counter the increasingly complex network threats faced by service and content providers. Distributed threats require a distributed solution that acknowledges the performance and reliability demands of a carrier-class infrastructure," said chief scientist and co-founder Dr. Farnam Jahanian. "This recognition from Red Herring and Network World validates the market opportunity and the strength of our architecture."

Based upon a compilation of subjective and metrical data favored by venture capitalists and investment bankers, Red Herring's editors chose Arbor Networks as a company to watch. They describe its technology as, "efficient and elegant," and note that "Arbor Networks is in the right market at the right time." They go on to say that Arbor's "technology allows ISPs to monitor their networks for denial of service (DoS) attacks without interrupting the network's flow. It's a subtle technological point, yet an important one to carriers, who have trouble enough managing increasingly complex networks."

The editors of Network World also laud Arbor Networks as one of the top ten networking companies "sharp enough for the long haul." Network World's editors chose companies primarily based on the innovation they have shown in creating new products or services aimed at addressing challenging new business needs and opening new markets. Based on the innovation of the service, industry experience of its founders, and testimonials from its beta testers, the editors go on to note that Arbor Networks "stands out for its technology, speed to market and investors." Network World also highlights that the Arbor technology is "designed to trace distributed denial-of-service attacks and filter out offending traffic without affecting network speed."

About the Red Herring "Ten to Watch"
Published in the May issue, the Red Herring "Ten to Watch" is held in conjunction with the Red Herring 100 and identifies the ten companies believed to be noteworthy in the coming year. In its fifth year, the annual Red Herring 100 has become the most revered list of its kind. The editors of Red Herring compile the list from the same qualitative insights used by venture capitalists and investment bankers-- insights that predict a company's ability to overturn existing markets or create entirely new ones. Whatever the state of public and private equity markets; these companies will matter.

The list, featured in the May 2001 issue and on Red Herring's website www.redherring.com, includes highly relevant information including the company's strategy, execution, products and services, brand, finances and competition. Joining the world's most influential thought leaders in finance, technology and business innovation, the Red Herring 100 will be recognized at Venture 2001, Red Herring's annual invitation-only summit to be held April 29 through May 1, 2001 at the Resort at Squaw Creek, Lake Tahoe, CA. For more information regarding Venture 2001, please visit www.redherring.com/events.

About Network World's "Ten Start-Ups to Watch in 2001"
The Network World "Ten Start-ups to Watch in 2001" is part of Network World's annual Network World 200 Issue, published Monday, April 23. Network World editors chose companies primarily based on the innovation they've shown in creating new products or services aimed at addressing challenging new business needs and opening new markets. Other considerations included the industry experiences of each company's founders, top executives and other personnel; the amount and type of funding the company has received; and early customer and test center testimonials, where applicable.

The Network World 200 Issue, part of Network world's premier Signature Series, profiles the 200 biggest U.S. based public companies in the network industry and provides guidance for determining the health and financial well-being of network vendors.

About Arbor Networks
Arbor Networks provides a distributed, non-intrusive, carrier-class managed availability service that allows firms to protect their greatest asset: the availability of their customers' sites. Arbor's solutions detect, trace, and filter threats to network availability, improving network uptime, performance and security, while lowering operational costs for web content and service providers. Arbor's patent-pending technology is based on three years of pioneering research in the availability, reliability and security of networks and distributed systems, conducted at the University of Michigan by Arbor founders. Headquartered in Waltham, Mass. with development facilities in Ann Arbor, Mich., Arbor is funded by Battery Ventures, a leading venture capital firm, and Cisco Systems, Inc. For more information, contact Arbor Networks at 781-684-0900 or at www.arbornetworks.com.

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Contact:

Jess Hawks
Arbor Networks
781.768.3253
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