The wide variety of features included in ISA Server 2006 makes it very versatile, and it
can be deployed to take advantage of one, two, or multiple functions. For example, ISA
could be deployed as a full-function firewall, allowing VPN access and web caching.
Or it could be deployed simply to filter RPC connections between network segments.
An added advantage to this flexibility is the fact that only those functions that are
required are turned on. This reduces the surface area that is exposed to attack, reducing
the overall threat.
19 Exploring ISA Server 2006??™s New Features
1
Choosing the Operating System for ISA Server 2006
It is necessary to install and deploy ISA Server 2006 servers on the Windows Server 2003
platform. Improvements in reliability, functionality, and, most importantly, security
dictate this. With ISA Server 2004, it was previously possible, though not recommended,
to install ISA Server 2004 on the Windows 2000 Operating System. This is no longer an
option with the 2006 version. In fact, 2006 requires both 2003 and Service Pack 1 at a
minimum to be installed.
It is important to note that because the ISA server holds a very important security role, it
is essential that you patch the operating system with the critical updates Microsoft
releases.
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