Two-factor authentication examples include which option?

Two-factor authentication examples include which option?

• A. Biometric only
• B. RADIUS with tokens
• C. Password alone
• D. PIN only

Answer: (B)

Two-factor authentication requires two different credential factors to prove identity, choosing from something you know, something you have, or something you are. The options that use only a single factor—such as a biometric alone, a password alone, or a PIN alone—aren’t two-factor. The only choice that clearly provides two factors is using a token with a RADIUS system, because a token is something you have and, in typical deployments, it is used together with another credential (often a password or PIN) to authenticate. The RADIUS service enforces checking both factors before granting access, satisfying two-factor authentication.

Two-factor authentication requires two different credential factors to prove identity, choosing from something you know, something you have, or something you are. The options that use only a single factor—such as a biometric alone, a password alone, or a PIN alone—aren’t two-factor. The only choice that clearly provides two factors is using a token with a RADIUS system, because a token is something you have and, in typical deployments, it is used together with another credential (often a password or PIN) to authenticate. The RADIUS service enforces checking both factors before granting access, satisfying two-factor authentication.