CompTIA Security+ Question E-82

Which of the following types of security services are used to support authentication for remote users and devices?

A. Biometrics
B. HSM
C. RADIUS
D. TACACS

Answer: C

Explanation:
RADIUS authentication phase takes place when a network client connects to a network access server (NAS) and provides authentication credentials. The NAS will then make use of the authentication credentials to issue a RADIUS authentication request to the RADIUS server, which will then exchange RADIUS authentication messages with the NAS.