SK0-004 · Question #223
Which of the following provides two-factor authentication?
The correct answer is A. Bank card and PIN. Two-factor authentication requires two different categories of credentials - something you have and something you know. A bank card (possession factor) combined with a PIN (knowledge factor) satisfies this requirement.
Question
Which of the following provides two-factor authentication?
Options
- ABank card and PIN.
- BUsername and password.
- CFingerprint and iris scan.
- DKey and proximity badge.
How the community answered
(38 responses)- A92% (35)
- B3% (1)
- D5% (2)
Why each option
Two-factor authentication requires two different categories of credentials - something you have and something you know. A bank card (possession factor) combined with a PIN (knowledge factor) satisfies this requirement.
A bank card represents 'something you have' (possession factor) and a PIN represents 'something you know' (knowledge factor). These are two distinct authentication categories, which is the definition of multi-factor authentication. Combining factors from different categories ensures that compromising one does not compromise the other.
A username and password are both 'something you know' factors, making this single-factor authentication despite requiring two inputs.
A fingerprint and iris scan are both 'something you are' (inherence/biometric) factors - two inputs from the same category do not constitute two-factor authentication.
A physical key and a proximity badge are both 'something you have' (possession) factors, so this remains single-factor authentication.
Concept tested: Multi-factor authentication factor categories
Source: https://csrc.nist.gov/glossary/term/two_factor_authentication
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