Hi,
Thanks for your question.
A network policy is a set of conditions, constraints, and settings that allow you to designate who is authorized to connect to the network and the circumstances under which they can or cannot connect.
To learn more details about Network Policy properties, please refer to the link below.
Network Policies
http://technet.microsoft.com/en-us/library/dd197530(v=WS.10).aspx
Best Regards,
Travis
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