Firewalls are necessary for a defense-in-depth strategy. Microsoft entered the firewall market with Internet Security and Acceleration Server (ISA Server). ISA Server was a follow-on release of Microsoft Proxy Server and part of the .Net Family. As with most Microsoft products, logging capabilities are included. ISA Server contains detailed security and access logs. You can install ISA Server in three different modes: firewall mode, web caching mode, or integrated mode. In firewall mode, you can secure communication between an internal network and the Internet using rules. You can publish internal servers so that their services are available to Internet users. In web caching mode, you can decrease network bandwidth with ISA Server storing commonly accessed objects locally. You can route web requests from the Internet to an internal Web Server. In integrated mode, all of these features are available.
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