The Cisco Secure Firewall with Adaptive Security Appliance (ASA) software provides robust, proven Layer 3 and 4 control. Ideal for small, mid-sized, and branch offices, this 1RU appliance includes support for advanced remote access VPN termination, plus Border Gateway Protocol (BGP) and Open Shortest Path First (OSPF) routing functions. When Layer 7 application control and advanced threat defense are also required, select instead the Firepower 1120 appliance with FTD software.The Cisco Secure Firewall with Adaptive Security Appliance (ASA) software provides robust, proven Layer 3 and 4 control. Ideal for small, mid-sized, and branch offices, this 1RU appliance includes support for advanced remote access VPN termination, plus Border Gateway Protocol (BGP) and Open Shortest Path First (OSPF) routing functions. When Layer 7 application control and advanced threat defense are also required, select instead the Firepower 1120 appliance with FTD software.