Microsoft Internet Security and Acceleration (ISA) Server is an integrated firewall and Internet caching server. Deploying ISA Server saves network bandwidth by providing faster Web access for users. ISA Server secures your network, allowing you to implement your business security policy by configuring a broad set of rules that specify which sites, protocols, and content can be passed through the firewall.
For more information about creating a virtual private network (VPN), see "Deploying Dial-Up and VPN Remote Access Servers" in this book.