Understanding ISA Server
Microsoft Internet Security and Acceleration (ISA) Server integrates firewall and cache features to secure your network and to improve its performance.
As a firewall, ISA Server routes requests and responses between the Internet and client computers after determining if the communication is allowed. As a cache, ISA Server stores frequently-requested Internet sites so that the objects can be quickly accessed by clients directly from the ISA Server computer, rather than from the Internet.
This section introduces ISA Server and describes ISA Server architecture and features. For information about specific topics, see: