Cisco ASA 5500 Series Adaptive Security Appliances are purpose-built solutions that integrate world-class firewall, unified communications security, VPN, intrusion prevention (IPS), and content security services in a unified platform.Cisco ASA 5500 Series Adaptive Security Appliances are a key component of the Cisco Self-Defending Network. The Cisco ASA 5500 Series provides intelligent threat defense that stops attacks before they penetrate the network perimeter, controls network and application activity, and delivers secure remote access and site-to-site connectivity. The result is a powerful multifunction network security appliance family that provides security breadth, precision, and depth for protecting business networks of all sizes, while reducing the overall deployment and operations costs associated with implementing comprehensive multilayer security.