What is a protocol used for carrying authentication, authorization, and configuration information
between a Network Access Server and a shared Authentication Server?

A.
IPSec

B.
RADIUS

C.
L2TP

D.
PPTP

Explanation:
RADIUS is a protocol for carrying authentication, authorization, and configuration
information between a Network Access Server, which desires to authenticate its links
and a shared Authentication Server. RADIUS is a standard published in RFC2138 as
mentioned above.