Understanding RADIUS Support on a Network Policy Server
As previously mentioned, installing the Network Policy and Access Services role adds support for the RADIUS protocol, an industry-standard authentication mechanism supported by a wide range of clients.
Note
The NPS role in Windows Server 2012 is the replacement for the legacy Internet Authentication Service (IAS) role. The old IAS role provided simple RADIUS authentication support to Active Directory sources.
RADIUS authentication allows for Active Directory users to be authenticated using RADIUS authentication, rather than AD DS authentication. This is commonly used in scenarios where VPN access requires RADIUS authentication or when other devices cannot use AD-based authentication. ...
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