CompTIA Linux+ (XK0-004) — Question 247

When logging in, an administrator must use a temporary six-digit code that is displayed on a key fob.
Which of the following has been implemented?

Answer options

• A. Biometrics
• B. HOTP
• C. PKI
• D. Software token

Correct answer: B

Explanation

The correct answer is B, HOTP, as it refers to the HMAC-based One-Time Password algorithm, which generates temporary codes for authentication. Options A (Biometrics) and C (PKI) do not involve temporary codes, while D (Software token) typically refers to applications that generate codes on devices rather than hardware like a key fob.