As you already know, Active Directory Services store account and group policy
information for an Active Directory Domain. NAP does not necessarily rely on
Windows Server 2008 Active Directory Domain Services or Windows Server 2003
Active Directory Domain Services. NAP definitely does not need Active Directory
Services to determine if a client is compliant, but other services and roles depend
on Active Directory Services.
Active Directory Domain Services is needed for Network Policy Server VPN
enforcement, IEEE 802.1x network device enforcement, or IPsec-based ...
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