The answer is to use CCTV with retention policies for monitoring, along with multi-factor authentication at entry points and a layered defense-in-depth approach. Multi-factor authentication, or MFA, combines two or more independent credentials—such as a smart card and PIN or a biometric and token—to verify identity, drastically reducing the risk of unauthorized access since compromising a single factor like a lost card is insufficient. On the CISSP exam, this concept tests your understanding of physical security controls within Domain 2 (Asset Security) and how they enforce the principle of defense-in-depth; a common trap is confusing MFA with simply having multiple passwords or thinking a single biometric scan alone qualifies. Remember the memory tip: “Something you have, something you are, something you know”—if only one of these is present, it is not true MFA, and the exam will penalize that oversight.
CISSP Security Operations Practice Question
This CISSP practice question tests your understanding of security operations. 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 of the following are best practices for securing a data center's physical access?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement multi-factor authentication at entry points
Multi-factor authentication (MFA) at entry points combines two or more independent credentials (e.g., smart card and PIN, or biometric and token) to verify identity. This significantly reduces the risk of unauthorized access because compromising a single factor (e.g., a lost card) is insufficient to gain entry. MFA aligns with the defense-in-depth principle and is a core physical security control for sensitive areas.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Implement multi-factor authentication at entry points
Why this is correct
Combining something you know, have, or are increases security.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Install a mantrap at the main entrance
Why this is correct
Mantraps prevent unauthorized individuals from following authorized personnel.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use only biometric readers for all doors
Why it's wrong here
Biometrics alone are single-factor and can be spoofed or have false rejects.
✗
Allow visitors to access the lobby without an escort
Why it's wrong here
Visitors should always be escorted or signed in.
✓
Use CCTV with retention policies for monitoring
Why this is correct
CCTV provides surveillance and evidence for incidents.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates might think biometric-only access (Option C) is inherently more secure, but CISSP emphasizes layered security and the need for multi-factor authentication to avoid single-factor vulnerabilities.
Detailed technical explanation
How to think about this question
A mantrap (Option B) is a physical security access control system consisting of two interlocking doors with a small vestibule between them. The first door must close and lock before the second door can open, preventing tailgating and ensuring only one authenticated person passes at a time. CCTV with retention policies (Option E) provides forensic evidence and deterrence; retention policies (e.g., 30-90 days) must align with legal and regulatory requirements (e.g., GDPR, SOX) and storage capacity.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Implement multi-factor authentication at entry points — Multi-factor authentication (MFA) at entry points combines two or more independent credentials (e.g., smart card and PIN, or biometric and token) to verify identity. This significantly reduces the risk of unauthorized access because compromising a single factor (e.g., a lost card) is insufficient to gain entry. MFA aligns with the defense-in-depth principle and is a core physical security control for sensitive areas.
What should I do if I get this CISSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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