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Difficulty: Very hardPhysical Security Controls

During a physical security evaluation at a financial firm's branch site, an auditor observes that unauthorized individuals can easily closely follow authorized personnel through card-swiped entry points into a sensitive data closet. The site manager requires a physical control that specifically restricts entry to one person at a time and actively prevents piggybacking without creating an emergency egress hazard. Which of the following physical security controls should be implemented?

  1. An access control vestibule equipped with interlocking doors and weight sensorsAnswer
  2. B
    Biometric door locks with keyless entry keypad deadbolts
  3. C
    Perimeter anti-ram concrete bollards along the building entrance
  4. D
    Privacy filters fitted onto all internal monitoring displays and keypad entry terminals

Answer

An access control vestibule equipped with interlocking doors and weight sensors is the correct physical security control.
An access control vestibule (also known as a mantrap) uses a set of two interlocking doors where the second door will not unlock until the first door closes completely. When combined with weight or optical sensors inside the vestibule, it enforces single-person entry and actively prevents tailgating or piggybacking.

Step-by-Step Solution

1
Analyze the physical security threat in the scenario
Identified tailgating/piggybacking where unauthorized individuals follow legitimate staff through secured doorways.
The scenario explicitly highlights unauthorized visitors walking closely behind authorized employees upon card entry.
2
Evaluate potential physical security mechanisms against anti-tailgating requirements
An access control vestibule (mantrap) enforces single-occupant progression using interlocking doors and presence/weight sensors.
Mantraps physically isolate the entry process so the second door will not unlock if multiple individuals are detected.
3
Differentiate correct control from ineffective alternatives
Biometrics, privacy screens, and bollards address authentication, visual privacy, and vehicle safety respectively, but fail to prevent tailgating.
Only an access control vestibule directly prevents physical piggybacking at pedestrian doorways.

Key Concept

Access Control Vestibules (Mantraps) for Anti-Tailgating
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Topics

Physical Security Controls

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