SSCP Security Operations and Administration Practice Question
A company is implementing a new access control system for its data center. Which physical security control is best for preventing tailgating?
⚠ Common exam trap
SSCP candidates often mistake authentication methods like biometric readers or key cards as preventive controls for tailgating. However, these are identification/authentication controls; preventing tailgating requires a physical barrier such as a mantrap that enforces one-at-a-time entry.
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
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Mantrap
A mantrap is specifically designed to prevent tailgating by using a small vestibule with two interlocking doors. Only one door can open at a time, and the system typically requires authentication (e.g., badge or biometric) to proceed, ensuring that only one authorized person enters per cycle. This physical barrier directly blocks unauthorized individuals from following an authorized user through a single entry point.
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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Mantrap
Why this is correct
A mantrap uses two interlocking doors with an enclosed vestibule, admitting one person at a time and preventing an unauthorised individual from following closely behind. This interlock mechanism directly defeats tailgating, unlike turnstiles, guards or cameras that detect but do not physically stop it.
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Biometric reader
Why it's wrong here
A biometric reader authenticates one person at a time but does not stop a second person slipping through behind them. It is tempting because it strengthens identity verification, yet tailgating is defeated by physical barriers such as turnstiles or mantraps that admit only one person per authentication.
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Security guard
Why it's wrong here
A security guard can challenge tailgaters, but human vigilance is inconsistent and a single guard cannot monitor every entry continuously. Guards suit lobbies and patrols; preventing tailgating at controlled doors relies on physical barriers such as turnstiles or mantraps.
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CCTV cameras
Why it's wrong here
CCTV cameras record tailgating after it happens but cannot physically prevent someone following an authorised person through a door. They are tempting because they deter and provide evidence, yet detection is retrospective; a mantrap or turnstile enforces one-person-at-a-time entry.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SSCP 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 SSCP exam.