[CISSP-D] TACACS/X-TACACS/TACACS+

Hi

I'm wondering if someone could clarify something for me regarding TACACS.

My understanding is;

-> TACACS uses UDP 
-> X-TACACS (The second release) uses TCP
-> TACACS+ (The third and final release) uses TCP

I've seen two questions on CCCure where it asks what protocol "TACACS" uses.
Now, going from what I've read TACACS uses UDP.   X-TACACS and TACACS+ both
use TCP. Now in both instances its been marked incorrect, the explanation
says;

"The original TACACS, developed in the early ARPANet days, had very limited
functionality and used the *UDP* transport. In the early 1990s, the protocol
was extended to include additional functionality and the transport changed
to *TCP*."

It states it 'used' UDP but says it was redeveloped to use TCP. 

Do I assume in the exam when they ask about TACACS that they aren't
distinguishing between the various versions and they assume "TACACS+", or
they do?

Cheers

Joe







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