Network Access Control NAC is certainly one of the most interesting new features of Windows Server 2008. NAC known as NAP is a policy enforcement platform built into Windows Vista, Windows Server 2008, and Windows XP Service Pack 3 that allows to better protect network assets by enforcing compliance with system health requirements. With NAC, u can create customized health requirement policies to validate computer health before allowing access or communication, automatically update compliant computers to ensure ongoing compliance, and optionally confine non compliant computers to a restricted network until they become compliant. www.directionsonmicrosoft.com/sample/DOMIS/update/2007/12dec/1207ws2cna.htm" And also have a look for complete reference here: http://technet.microsoft.com/en-us/network/bb545879.aspx Thanks

Network Access Control NAC is certainly one of the most interesting new features of Windows Server 2008. NAC known as NAP is a policy enforcement platform built into Windows Vista, Windows Server 2008, and Windows XP Service Pack 3 that allows to better protect network assets by enforcing compliance with system health requirements. With NAC, u can create customized health requirement policies to validate computer health before allowing access or communication, automatically update compliant computers to ensure ongoing compliance, and optionally confine non compliant computers to a restricted network until they become compliant. www.directionsonmicrosoft.com/sample/DOMIS/update/2007/12dec/1207ws2cna.htm" And also have a look for complete reference here: http://technet.microsoft.com/en-us/network/bb545879.aspx Thanks