By far the most popular AAA service, what open-source service runs in the Application layer and can use UDP or TCP in the Transport layer?
A) Google Authenticator
B) RADIUS
C) TACACS+
D) Kerberos

Question

Quizplus · Accepted Answer

RADIUS (Remote Authentication Dial-In User Service) is an open-source service that runs in the Application layer and can use UDP or TCP in the Transport layer. It is widely used as a AAA service for managing and authenticating user access to networks and resources. Google Authenticator, TACACS+, and Kerberos are also authentication protocols, but they do not have the same level of popularity and ubiquity as RADIUS.

By Far the Most Popular AAA Service, What Open-Source Service