The
different hats that ISA wears are numerous: VPN server, web proxy, Application-layer filter,
RPC filter for WAN segment traffic, intrusion detection server, and many more. The capability
of ISA to integrate and work with existing security solutions enables organizations to
preserve their existing investment in security solutions.
15 Understanding the History of ISA Server 2006
1
NOTE
For more information on deploying ISA as an additional security layer to an existing
third-party security environment, see Chapter 7, ???Deploying ISA Server as a Reverse
Proxy in an Existing Firewall DMZ.???
Understanding the History of ISA Server 2006
Although ISA Server has only recently begun to gain wide industry acceptance, it actually
has a long history relative to other computer products. The original version of this
product, Proxy Server 1.x/2.x, was geared more toward web caching and proxy capabilities,
but newer versions, namely ISA Server 2000, ISA Server 2004, and the newest version,
ISA Server 2006, have stressed and focused on the security aspects of the product, improving
them and adding functionality. To better understand where ISA Server is today, it is
important to get a better understanding of how it got where it is.
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