Authentication Methods
RADIUS supports a variety of different protocol mechanisms to transmit sensitive user-specific data to and from the authentication server. The two most common are the Password Authentication Protocol (PAP) and the CHAP. RADIUS also allows for more attributes and methods developed by vendors, including support for features peculiar to Windows NT, Windows 2000, and other popular network operating systems and directory services. The following section explores the two most common methods in greater detail.
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