CISSP Security Architecture and Engineering Practice Question
An organization is implementing a defense-in-depth strategy for a data center. Which THREE of the following are examples of physical security controls that align with layered defense?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Card reader at building entrance
Layered physical security includes perimeter fencing, building access controls (e.g., card readers), and internal secure areas (e.g., server cages).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Antivirus software
Why it's wrong here
Antivirus software is a prime example of a technical or logical control, not a physical one. It operates at the software layer of an endpoint, scanning for malicious code and protecting data integrity and system availability, rather than physically restricting access to a facility or hardware.
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Intrusion detection system on the network
Why it's wrong here
An Intrusion Detection System (IDS) on the network is a technical control designed to monitor network traffic for suspicious patterns or policy violations. While vital for detecting cyber threats and a key component of defense in depth, it does not physically prevent unauthorized access to a building, data center, or server equipment.
- ✓
Card reader at building entrance
Why this is correct
A card reader at a building entrance is a definitive physical access control mechanism, serving as a critical layer in a defense-in-depth strategy. It enforces authentication and authorization requirements before granting physical entry to a facility, directly restricting human movement and protecting all assets within from unauthorized personnel.
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Server cage locks
Why this is correct
Server cage locks represent a crucial physical control designed to protect high-value IT assets, such as servers and networking equipment, often located within a data center or secure room. These locks provide an additional layer of physical security, preventing unauthorized individuals from directly manipulating or removing sensitive hardware, even if they have gained access to the broader facility.
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Perimeter fencing
Why this is correct
Perimeter fencing is a foundational physical control that establishes the outermost boundary of a secure area, acting as the first line of defense in a multi-layered physical security strategy. Its primary purpose is to deter casual intrusion, delay determined attackers, and clearly define the property line, making unauthorized entry more difficult and noticeable.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CISSP 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 CISSP exam.