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The Network Policy and Access Services role provides a number of specific services on a server running Windows Server 2008. These services include the Network Policy Server, Routing and Remote Access, which includes the Remote Access Service (RAS). RAS can be used to configure secure Virtual Private Networking connections and traditional dial-in connections for your remote users.
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The Network Policy Server can also be configured for network access protection (NAP) for your wired network, based on health policies. This means that your network will be secured because the NAP server checks the “health” of client computers based on whether or not they are running the Windows firewall, have the latest antivirus signatures, and have the latest Windows updates. Hour 11, “Deploying Group Policy and Network Access Protection,” discusses NAP as related to health policies.