CompTIA Security Plus Mock Test Q871

Which of the following is an authentication and accounting service that uses TCP for connecting to routers and switches?

A. DIAMETER
B. RADIUS
C. TACACS+
D. Kerberos

Correct Answer: C
Section: Access Control and Identity Management

Explanation:
TACACS+ is an authentication, authorization, and accounting (AAA) service that makes us of TCP only.

Incorrect Answers:
A: DIAMETER makes use of TCP, as well as SCTP.
B: RADIUS makes use of UDP.
D: Kerberos is not an authentication and accounting service, but an authentication protocol.

References:
http://en.wikipedia.org/wiki/TACACS
http://en.wikipedia.org/wiki/Diameter_(protocol)
http://en.wikipedia.org/wiki/RADIUS
http://en.wikipedia.org/wiki/Kerberos_(protocol)