The Cisco ASA 5540 Adaptive Security Appliance delivers a wide range of high-performance, high-density security services with Active/Active high availability and Gigabit Ethernet connectivity for medium-to-large enterprise and service-provider networks, in a reliable, modular appliance. Using its four Gigabit Ethernet interfaces and support for up to 100 VLANs, businesses can segment their network into numerous zones for improved security.