Which of the following statements pertaining to RADIUS is incorrect:

The correct answer is D. Most RADIUS servers can work with DIAMETER servers. RADIUS (Remote Authentication Dial-In User Service) and DIAMETER are separate, incompatible AAA protocols. DIAMETER was designed as a successor and significant improvement to RADIUS, but the two are not directly interoperable - RADIUS servers do not natively work with DIAMETER…

Submitted by kavita_s· Apr 18, 2026Network and Communications Security

Question

Options

AA RADIUS server can act as a proxy server, forwarding client requests to other
BMost of RADIUS clients have a capability to query secondary RADIUS servers for
CMost RADIUS servers have built-in database connectivity for billing and reporting purposes.
DMost RADIUS servers can work with DIAMETER servers.

How the community answered

(26 responses)

A
4% (1)
C
4% (1)
D
92% (24)

Explanation

RADIUS (Remote Authentication Dial-In User Service) and DIAMETER are separate, incompatible AAA protocols. DIAMETER was designed as a successor and significant improvement to RADIUS, but the two are not directly interoperable - RADIUS servers do not natively work with DIAMETER servers. The other statements are correct: RADIUS can act as a proxy (A), clients can query secondary/backup RADIUS servers for redundancy (B), and most RADIUS servers include built-in database connectivity for billing and logging (C).

Topics

#RADIUS#Authentication Protocols#AAA#DIAMETER

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