A company requires that a user’s credentials include providing something they know and something they
are in order to gain access to the network. Which of the following types of authentication is being
described?

A.
Biometrics

B.
Kerberos

C.
Token

D.
Two-factor

Explanation:
Two-factor authentication is when two different authentication factors are provided for authentication
purposes. In this case, “something they know and something they are”.
Incorrect Answers:
A: Biometrics refers to a collection of physical attributes of the human body that can be used for
authentication. It is an authentication factor type. Something they are.
B: Kerberos is used for the security and protection of authentication credentials.
C: Tokens is an authentication factor type. Something they have.

Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp. 272, 280, 281,
282