The Cisco CSS 11501, with the award-winning Cisco Web Network Services (WebNS) Software, is specifically designed to provide robust application delivery (Layer 4 to 7) services for Internet and intranet data centers. It introduces an intelligent, distributed architecture to help organizations meet the real-world scaling requirements of today's application infrastructure. It improves application and site availability and transaction integrity by introducing Adaptive Session Redundancy (ASR), an industry standard in stateful failover. It delivers the greatest flexibility of any content switch in its class for customizing combinations of ports, performance, and services. It scales secured application transaction performance through support of an integrated, high-capacity Secure Sockets Layer (SSL) module. Off-loading SSL onto the network improves the overall performance of the web and application server enabling better application performance. It provides an integrated high-capacity web application (Hypertext Transfer Protocol, HTTP) compression module. The Cisco CSS modular design protects investments by enabling upgrades of performance, ports, and services to meet your current and future application demands.