Applies To: Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2 Network Policy Server (NPS) can be used as a Remote Authentication Dial-In User Service (RADIUS) server to perform authentication, authorization, and accounting for RADIUS clients. A RADIUS client can be an access server, such as a dial-up server or wireless access point, or a RADIUS proxy. When NPS is used as a RADIUS
![RADIUS Server](https://cdn-ak-scissors.b.st-hatena.com/image/square/d6e4cb632c7025e9f5e05fd314fbf6dcd6144e8d/height=288;version=1;width=512/https%3A%2F%2Flearn.microsoft.com%2Fen-us%2Fmedia%2Fopen-graph-image.png)