Which role service should you include in the recommendation?

Updated: March 29, 2012
Applies To: Windows Server 2008 R2, Windows Server 2012
Network Policy Server
Network Policy Server (NPS) allows you to create and enforce organization-wide network access policies for client health, connection request authentication, and connection request authorization. In addition, you can use NPS as a Remote Authentication Dial-In User Service (RADIUS) proxy to forward connection requests to a server running NPS or other RADIUS servers that you configure in remote RADIUS server groups. NPS allows you to centrally configure and manage network access authentication, authorization, are client health policies with the following three features: RADIUS server. NPS performs centralized authorization, authorization, and accounting for wireless, authenticating switch, remote access dialup and virtual private network (VNP) connections. When you use NPS as a RADIUS server, you configure network access servers, such as wireless access points and VPN servers, as RADIUS clients in NPS. You also configure network policies that NPS uses to authorize connection requests, and you can configure RADIUS accounting so that NPS logs accounting information to log files on the local hard disk or in a Microsoft SQL Server database. For more information, see RADIUS Server.
http://technet.microsoft.com/en-us/library/cc732912.aspx