Which of the following services are used to support authentication services for several local devices from a central location without the use of tokens?

A.
TACACS+

B.
Smartcards

C.
Biometrics

D.
Kerberos

Explanation:
ACACS allows a client to accept a username and password and send a query to a TACACS authentication server. It would determine whether to accept or deny the
authentication request and send a response back. The TIP would then allow access or not based upon the response, not tokens.
Incorrect Answers:
B: Smartcards are also known as identity tokens containing integrated circuits.
C: Biometrics is used for user authentication, not device authentication.
D: Kerberos uses tickets, which lists the privileges of that user, much like a token.

http://en.wikipedia.org/wiki/TACACS

Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp 275, 282, 285.
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, Sixth Edition, Sybex, Indianapolis, 2014, p 148.