The Integrated Service Adapter optimizes the Catalyst 4000 Access Gateway Module for virtual private networks (VPNs). The ISA provides up to ten times the performance over software-only encryption by offloading the encryption processing from the router central processing unit (CPU). Ideal for use in branch offices to connect to the enterprise IP WAN, mobile users, partner extranets, or service provider managed-services customer premises equipment (CPE), the Catalyst 4000 Access Gateway Module with the ISA delivers a rich integrated package of routing, firewall, intrusion-detection, and VPN functions. As an integral component of Cisco VPN solutions, the Access Gateway Module with the ISA provides industry-standard encryption (IPSec), application-aware quality of service (QoS) and bandwidth management, and robust perimeter security options.