Which of the following statement is most correct concerning RADIUS and TACACS+?

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A. RADIUS has rich accounting and TACACS+ is capable of customizable userlevel policies such as command authorization.
B. RADIUS encrypts the whole communication between the AAA client and server, whereas TACACS+ only encrypts the password.
C. RADIUS uses UDP for transport and TACACS+ uses TCP.
D. RADIUS is a proprietary standard, whereas TACACS+ is Open Source.
E. RADIUS uses UDP ports 1645 and 1646 exclusively.

Asked by Hargroveb, Last updated: Nov 09, 2024

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Hargroveb

Answered Apr 07, 2018

RADIUS has rich accounting and TACACS+ is capable of customizable userlevel policies such as command authorization.
RADIUS uses UDP for transport and TACACS+ uses TCP.

Answer B is backwards. Its TACACS+ that encrypts the whole communication, whereas RADIUS encrypts only the password. Answer D is incorrect but for a tricky reason. Although RADIUS is open source, TACACS+ isnt quite a proprietary standard because Cisco has published it as an RFC (Request for Comment), part of the IETF standards track. Answer E is incorrect because RADIUS can use either ports 1645 and 1646 or ports 1812 and 1813 for authentication/authorization and accounting, respectively.