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Difficulty: HardPhysical Security Controls

A corporate security technician is upgrading physical security access controls for an enterprise data hall housing sensitive financial records. Recent internal audits identified that unauthorized personnel have repeatedly gained entry into the secure hallway by closely following authorized staff through open door swings (tailgating). The security team requires a solution that physically enforces single-person entry per valid credential scan without requiring continuous physical monitoring by security guards. Which of the following physical security controls best meets these requirements?

  1. An access control vestibule equipped with interlocking doors and presence sensorsAnswer
  2. B
    Closed-circuit television (CCTV) cameras paired with motion-activated infrared illuminators
  3. C
    Concrete bollards installed along the entry perimeter combined with physical cable locks
  4. D
    Polarized privacy filters applied to electronic access keypads and adjacent window panels

Answer

An access control vestibule equipped with interlocking doors and presence sensors
An access control vestibule (mantrap) provides automated physical enforcement against tailgating. It functions by locking an individual inside a small chamber between two interlocking doors until single-occupancy identity verification occurs, ensuring that only one person enters per valid authentication attempt without needing round-the-clock security personnel.

Step-by-Step Solution

1
Identify the primary threat vector in the scenario
The threat vector is physical tailgating (piggybacking), where unauthorized individuals closely follow authorized employees through unlocked access doors.
Understanding the threat vector determines whether detective, deterrent, or physical preventive controls are required.
2
Analyze operational constraints and enforcement criteria
The required control must physically restrict access to one person per authentication event automatically, eliminating reliance on human security guards.
Detective controls like CCTV only record events after entry, failing the automated physical prevention requirement.
3
Select the appropriate preventive physical security mechanism
An access control vestibule (mantrap) utilizes two interlocking doors with integrated weight or presence sensors, preventing the inner door from unlocking until only one authenticated person is inside the chamber.
Interlocking access control vestibules are specifically designed to eliminate tailgating through physical containment.

Key Concept

Access Control Vestibules (Mantraps)
Estimated Time:1m 30s
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Topics

Physical Security Controls

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