Suggested Answer:A🗳️
TACACS+ is a proprietary Cisco enhancement to TACACS and is more robust than RADIUS. PAP is not a remote access authentication system but a remote node security protocol. Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3: Telecommunications and Network Security (page 122).
Correct answer is A.
TACACS+ uses TCP transport protocol on port 49, which makes it more reliable than RADIUS, which uses UDP.
TACACS+ allows to control the authorization of router commands on a per user or per group basis. TACACS+ can do this because it separates authentication and authorization functions, while RADIUS can’t because it combines them. So RADIUS does not allow to control your users on which commands can be executed on a router and which cannot.
Another important advantage is that TACACS+ encrypts the entire payload of the TACACS+ packet, which provides secure communication between the Network Access Server (NAS) and the TACACS+ server. RADIUS, on the other hand, encrypts only the password, so intercepting packets can reveal important information.
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