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CompTIA Security+ All-in-One Exam Guide, Third Edition by Chuck Cothren, Roger Davis, Dwayne Williams, Gregory White, Wm. Arthur Conklin

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RADIUS

Remote Authentication Dial-In User Service (RADIUS) is a protocol that was developed originally by Livingston Enterprises (acquired by Lucent) as an AAA protocol. It was submitted to the Internet Engineering Task Force (IETF) as a series of RFCs: RFC 2058 (RADIUS specification), RFC 2059 (RADIUS accounting standard), and updated RFCs 2865–2869 are now standard protocols. The IETF AAA Working Group has proposed extensions to RADIUS (RFC 2882) and a replacement protocol DIAMETER (Internet Draft DIAMETER Base Protocol).

RADIUS is designed as a connectionless protocol utilizing User Datagram Protocol (UDP) as its transport level protocol. Connection type issues, such as timeouts, are handled by the RADIUS application instead of the transport ...

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