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F5 Networks Ranked #1 in Dell'Oro Group Reportc

F5 Leads Quarterly Revenue Growth and Gains Largest Market Share for the Layer 4-7 Server Load Balancing Switch Market

F5 Networks, Inc. (NASDAQ: FFIV), the leading provider of Application Traffic Management products, today announced the company posted the highest revenue growth of any vendor in the Layer 4-7 (L4-7) Fixed Server Load Balancing (SLB)1 switch market for the first quarter of 2003, with a 30 percent revenue increase over the last quarter ending December 31, 2002. This represents an increase of 40 percent in revenue growth from the same quarter of 2002 - the greatest year-over-year increase of all vendors tracked by a recent Dell'Oro Group Report2.

Of all vendors measured in the report, F5 posted the largest gain in market share, up 4.4 percent in fixed L4-7 market share from the previous quarter, rising to 24.7 percent market share from 20.3 percent.

"We attribute F5's success to our products' ability to drastically reduce costs and quickly improve performance of IP based applications and Web services," said Dan Matte, vice president of product management and marketing at F5 Networks. "Customers have come to trust the F5 brand and relate it to high availability and greater security; as we consistently beat our customers' expectations, F5's commitment to superiority continues to perpetuate the industry."

The Dell'Oro Report measured market share based on revenue attainment for all major L4-7 SLB switch manufacturers. According to the Dell'Oro report, sales of F5 BIG-IP Application Switches grew to $12.8 million for the quarter from $9.8 million from the previous quarter.

1 Layer 4-7 Fixed Server Load Balancing (SLB) definition: Switches specially designed to switch network or Internet traffic optimally between a group of servers and must load balance traffic based on L4/L7 information (e.g. TCP port, URL, Cookie). Load balancing functionality must be native to the switch.

2 Source: Dell'Oro Group 1Q 2003 Ethernet (Layer 4-7) Switch Report, May 14, 2003.

About F5 Networks

F5 Networks is the industry leader in Application Traffic Management, enabling enterprises and service providers to optimize any mission-critical application or web service, providing secure and predictable delivery of application traffic in an unpredictable environment. Through F5's unique open iControl™ API, third party applications and network devices can take an active role in shaping network traffic, delivering application aware networks that allow customers to direct traffic based on their exact business requirements. Our solutions optimize the availability, security and speed of mission-critical servers and applications, including enterprise applications, web services, mobile IP applications, web publishing, content delivery, e-commerce, caching, firewalls and more. F5's solutions are widely deployed in large enterprises, the top service providers, financial institutions, government agencies, healthcare, and portals throughout the world. The company is headquartered in Seattle, Washington, and has offices throughout North America, Europe, Japan and Asia Pacific. F5 Networks is located on the web at

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