Quick Answer
The answer is smart card, fingerprint scan, and password, as these represent the three core categories of authentication methods: something you have, something you are, and something you know. A smart card is a valid method because it is a physical token that a user possesses, while a fingerprint scan falls under biometric authentication, verifying a unique physical characteristic of the user, and a password relies on secret knowledge. On the ISC2 Certified in Cybersecurity CC exam, this question tests your understanding of the three-factor authentication framework, often presenting distractors like a PIN or a security question, which are actually subtypes of the knowledge factor. A common trap is confusing a PIN with a smart card, but remember that a PIN is still something you know, not something you have. For a quick memory tip, think of the mnemonic “Have, Are, Know” to recall the three valid authentication methods: smart card (have), fingerprint (are), and password (know).
This CC practice question tests your understanding of access controls concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which THREE are valid methods for authenticating a user in an access control system?
User ID
Why wrong: User ID is identification, not authentication.
Fingerprint scan
Fingerprint is inherence factor.
Password
Password is knowledge factor.
Smart card
Smart card is possession factor.
Access control list
Why wrong: ACL is an authorization mechanism, not authentication.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Fingerprint scan
A fingerprint scan is a valid authentication method because it falls under 'something you are' (biometric authentication). In access control systems, biometrics like fingerprint scans provide a high level of assurance by verifying a unique physical characteristic of the user, making it a strong factor for authentication.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
User ID
Why it's wrong here
User ID is identification, not authentication.
Fingerprint scan
Why this is correct
Fingerprint is inherence factor.
Related concept
Read the scenario before looking for a memorised answer.
Password
Why this is correct
Password is knowledge factor.
Related concept
Read the scenario before looking for a memorised answer.
Smart card
Why this is correct
Smart card is possession factor.
Related concept
Read the scenario before looking for a memorised answer.
Access control list
Why it's wrong here
ACL is an authorization mechanism, not authentication.
Common exam traps
ISC2 often tests the distinction between identification (e.g., User ID) and authentication (e.g., password, biometric, smart card), and the trap here is that candidates mistakenly treat a User ID as an authentication factor rather than just an identifier.
Detailed technical explanation
Biometric authentication systems, such as fingerprint scanners, typically use minutiae matching (e.g., ridge endings and bifurcations) to compare a live scan against a stored template. In real-world deployments, liveness detection is critical to prevent spoofing attacks using gelatin or silicone replicas, and many systems now incorporate multispectral imaging to capture subsurface fingerprint features.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
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FAQ
Access Controls Concepts — This question tests Access Controls Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Fingerprint scan — A fingerprint scan is a valid authentication method because it falls under 'something you are' (biometric authentication). In access control systems, biometrics like fingerprint scans provide a high level of assurance by verifying a unique physical characteristic of the user, making it a strong factor for authentication.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This CC practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CC exam.
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