In addition, confusion
around whether a client software piece is required for
ISA Server has led many organizations to shy away from
deploying ISA Server.
The truth is that ISA Server itself supports three unique
types of clients (excluding the VPN client), two of which do
not require any software components to be installed. The
fact that, by default, an ISA server does not require any
client software or client licensing plays very well in ISA
Server??™s favor: The impact and risk of installing ISA Server
into an environment is low.
Of course, the fact that ISA does not require the full client
does not mean that it is not useful in certain cases. It allows
for a much greater level of control and security over an
environment. The powerful ISA client allows for user-level
authentication and access control, as well as complex protocol
support and other advanced features.
This chapter provides an outline of the three types of ISA
clients: the SecureNAT client, the Web Proxy client, and the
full ISA client. A fourth type of client, the VPN client, is
briefly described. Deployment scenarios covering ISA clients
are outlined and illustrated.
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