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.