CompTIA Security Plus Mock Test Q863

Which of the following is an authentication service that uses UDP as a transport medium?

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

Correct Answer: D
Section: Access Control and Identity Management

Explanation
Explanation/Reference:
RADIUS runs in the application layer and makes use of UDP as transport.

Incorrect Answers:
A: TACACS+ makes use of TCP.
B: LDAP makes use of TCP.
C: Kerberos Makes use of both UDP and TCP.

References:
http://en.wikipedia.org/wiki/RADIUS
http://en.wikipedia.org/wiki/TACACS
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, p. 273
https://tools.ietf.org/html/rfc6251