In Windows Server 2008, Network Access Service includes the following:
- VPN Server
- Active Directory Domain services (AD DS)
- IEEE 802.1X Devices – provides port based authentication of users
- Dynamic Host Configuration Protocol (DHCP) Server – Responsible for leasing IP addresses
- NAP Health Policy Server – Provides authentication services for other network access components
- Health Registration Authority – Obtains health certificates for clients passing the health policy verification
- Remediation Servers – A new server for Windows Server 2008 on a limited network, designed to treat machines that do not have the latest antivirus or Windows updates, by pushing the updates down to the NAP client sitting in the restricted network before the client accesses the main network
