A Citrix NetScaler is an application switch that intelligently distributes,optimizes, and secures Layer 4-Layer 7 (L4-L7) network traffic for Webapplications. Features include load balancing, compression, Secure Sockets Layer(SSL) offload, a built-in application firewall, and dynamic content caching.

A NetScaler performs application-specific traffic analysis to provide a moreeffective implementation of the features. For example, a NetScaler makes loadbalancing decisions on individual HTTP requests rather than on the basis of longlivedTCP connections, so that the failure or slowdown of a server is managedmuch more quickly and with less disruption to clients. Other features can be usedto reduce load and simplify server-farm management, and to accelerate end-userperformance.

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