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F5 Networks Holds the No. 1 Market Share Position in the Layer 4-7 Ethernet Fixed Switch Market

With 47% market share F5 experienced highest quarterly revenue growth fueled by sales of its unique BIG-IP product, according to Dell'Oro Group Research

F5 Networks, Inc. (NASDAQ: FFIV), the global leader in Application Delivery Networking, today announced its continued domination in the L4-L7 Fixed1 Server Load Balancing (SLB) switch market. According to a recent Dell'Oro Group Report2, F5's market share has grown to 47 percent, positioning the company as the clear market leader over Cisco and Nortel.

The market reaction to BIG-IP v9 and F5's unique TMOS architecture has been very positive. That, combined with continued strength of F5's iControl partnerships, helped drive almost 50% of F5's product revenue in the past quarter. In addition, the increasing sophistication of F5's unique iRule application development capability has insured the company's continued successful penetration into larger enterprise accounts and service providers.

"The main reasons F5 continues to grow its revenue in this market over the competition is due to the BIG-IP product's unmatched full proxy architecture, iRule intelligence, application security and acceleration capabilities," said Dan Matte, SVP of Marketing at F5 Networks. "F5's BIG-IP product enables customers to automate functions that previously would have to be done in the application itself, saving them significant development and management costs."

About the BIG-IP Product

Located in the data center in front of servers, firewalls and gateways, F5's BIG-IP allows organizations to extend the benefits of Application Delivery Networking to all of their IP-based applications. Application Delivery Networking allows organizations to ensure quality of service and manageability, apply business policies and rules to content delivery, support increasing traffic volumes, deliver their applications securely, enjoy operational efficiency and cost control, and remain flexible to future application and infrastructure changes to protect their investments. F5's iRules, integrated with BIG-IP and the TMOS platform, allows customers to offload critical functions from applications and run them more efficiently within BIG-IP. F5 recently showcased the power of iRules by launching the "iRule, Do You?" contest. For more details on the results visit .

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 CY Q3 2005 Market Share Report (Layer 4-7) Switched Ethernet Server Load Balancing Report, Nov 15, 2005.

About F5 Networks

F5 Networks is the global leader in Application Delivery Networking. F5 provides solutions that make applications secure, fast and available for everyone, helping organizations get the most out of their investment. By adding intelligence and manageability into the network to offload applications, F5 optimizes applications and allows them to work faster and consume fewer resources. F5's extensible architecture intelligently integrates application optimization, protection for the application and the network, and delivers application reliability - all on one universal platform. Over 9,000 organizations and service providers worldwide trust F5 to keep their applications running. The company is headquartered in Seattle, Washington with offices worldwide. For more information go to

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This press release may contain forward looking statements relating to future events or future financial performance that involve risks and uncertainties. Such statements can be identified by terminology such as "may," "will," "should," "expects," "plans," "anticipates," "believes," "estimates," "predicts," "potential," or "continue," or the negative of such terms or comparable terms. These statements are only predictions and actual results could differ materially from those anticipated in these statements based upon a number of factors including those identified in the company's filings with the SEC.