This CC practice question tests your understanding of security principles. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
A company has implemented a policy where all employees must use a smart card and PIN to access the data center. Which security principle does this practice support?
Keep it simple
Why wrong: Simplicity is not the principle here.
Defense in depth
Correct. Multiple factors create depth.
Least privilege
Why wrong: Least privilege is about permissions, not authentication.
Fail-safe
Why wrong: Fail-safe is about system failure behavior.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Defense in depth
The use of both a smart card (something you have) and a PIN (something you know) creates a multi-factor authentication mechanism. This layered approach ensures that even if one factor is compromised, the other still provides protection, which is the core of the defense-in-depth principle. Defense in depth is about implementing multiple, overlapping security controls rather than relying on a single point of defense.
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.
Keep it simple
Why it's wrong here
Simplicity is not the principle here.
Defense in depth
Why this is correct
Correct. Multiple factors create depth.
Related concept
Read the scenario before looking for a memorised answer.
Least privilege
Why it's wrong here
Least privilege is about permissions, not authentication.
Fail-safe
Why it's wrong here
Fail-safe is about system failure behavior.
Common exam traps
ISC2 often tests the concept that defense in depth is about multiple layers of security, not just multiple factors of authentication, but here the smart card and PIN specifically represent two distinct authentication factors, which is a clear example of a layered defense.
Detailed technical explanation
Under the hood, the smart card stores a private key and a digital certificate (e.g., X.509) that is used for mutual authentication with the access control system, while the PIN unlocks the card's cryptographic module. In a real-world scenario, if an attacker steals the smart card but does not know the PIN, they cannot authenticate; conversely, if the PIN is guessed but the card is missing, access is still denied. This layered authentication is a classic implementation of defense in depth, as it combines physical possession with a shared secret.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
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FAQ
Security Principles — This question tests Security Principles — Read the scenario before looking for a memorised answer..
The correct answer is: Defense in depth — The use of both a smart card (something you have) and a PIN (something you know) creates a multi-factor authentication mechanism. This layered approach ensures that even if one factor is compromised, the other still provides protection, which is the core of the defense-in-depth principle. Defense in depth is about implementing multiple, overlapping security controls rather than relying on a single point of defense.
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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