Network Access Protection (
NAP) is a Microsoft
technology for controlling network access of a computer host based on
the system health of the host, first introduced in
Windows Server 2008.
With Network Access Protection, system administrators of an
organization's computer network can define policies for system health
requirements. Examples of system health requirements are whether the
computer has the most recent operating system updates installed, whether
the computer has the latest version of the anti-virus software
signature, or whether the computer has a host-based firewall installed
and enabled. Connecting or communicating computers have their health
status evaluated. Computers that comply with system health requirements
have full access to the network. Administrators can configure health
policies that make it possible to ensure that computers not in
compliance with system health requirements have restricted access to the
network.
for more info. please visit the links below
http://en.wikipedia.org/wiki/Network_Access_Protection
http://msdn.microsoft.com/en-us/library/cc895519%28v=vs.85%29.aspx
http://technet.microsoft.com/en-us/network/bb545879
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