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CCIE Security Exam Quick Reference Sheets by Lancy Lobo, Umesh Lakshman

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Chapter 2. Security Protocols

RADIUS

  • RADIUS is a client/server protocol that uses the User Datagram Protocol (UDP) as the transport protocol. It is used for authentication, authorization, and accounting (AAA).
  • The RADIUS specification RFC 2865 obsoletes RFC 2138. The RADIUS accounting standard RFC 2866 obsoletes RFC 2139.
  • The RADIUS protocol defines things in terms of attributes. Each attribute may take on one of a set of values. When a RADIUS packet is exchanged among clients and servers, one or more attributes and values are sent pairwise as an attribute-value pair (A-V pair).

Figure 2-1 depicts the RADIUS authentication process.

FIGURE 2-1 RADIUS authentication process

Step 1. Network Access Server Sends an Access Request to AAA server. ...

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