NOTE
The specific focus of this book is on the 2006 version of the product; all the examples
and step-by-step guides assume the use of this latest version. For in-depth knowledge
into the ISA Server 2004 product, we recommend reviewing the ISA Server 2004
Unleashed book by the same author and publisher.
Understanding the Need for ISA Server 2006
A great deal of confusion exists about the role that ISA Server can play in a network environment.
Much of that confusion stems from the misconception that ISA Server is only a
proxy server. ISA Server 2006 is, on the contrary, a fully functional firewall, VPN, webcaching
proxy, and application reverse-proxy solution. In addition, ISA Server 2006
addresses specific business needs to provide a secured infrastructure and improve productivity
through the proper application of its built-in functionality. Determining how these
features can help to improve the security and productivity of an organization is subsequently
of key importance.
In addition to the built-in functionality available within ISA Server 2006, a whole host of
third-party integration solutions provides additional levels of security and functionality.
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