Which of the following are proprietarily implemented by CISCO?

A.
RADIUS+

B.
TACACS

C.
XTACACS and TACACS+

D.
RADIUS

Explanation:
Cisco implemented an enhanced version of TACACS, known as XTACACS (extended TACACS),
which was also compatible with TACACS. It allowed for UDP and TCP encoding. XTACACS
contained several improvements: It provided accounting functionality to track length of
login and which hosts a user connected to, and it also separated the authentication,
authorization, and accounting processes such that they could be independently
implemented. None of the three functions are mandatory. XTACACS is described in RFC
1492.
TACACS+ is the latest Cisco implementation. It is best described as XTACACS with
improved attribute control (authorization) and accounting.