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Difficulty: HardPhysical Security Controls

An IT security technician is auditing physical security for a high-security server room at a branch office. Audit logs indicate that unauthorized individuals have repeatedly gained entry by following authorized personnel closely through the primary entrance door immediately after a valid badge scan. The organization requires a physical security enhancement that enforces single-person entry and prevents tailgating without requiring dedicated physical security guard staff. Which of the following physical security controls should the technician recommend?

  1. An access control vestibule equipped with interlocking doors and presence sensorsAnswer
  2. B
    Biometric fingerprint scanners installed on the exterior of the server room entrance
  3. C
    High-resolution closed-circuit television (CCTV) cameras positioned directly above the doorway
  4. D
    Industrial concrete bollards installed along the exterior perimeter wall of the server room

Answer

An access control vestibule equipped with interlocking doors and presence sensors is the most effective physical control to prevent tailgating.
An access control vestibule (mantrap) consists of a small space with two interlocking doors. The inner door will not unlock until the outer door closes completely and internal weight or presence sensors confirm single occupancy, effectively blocking tailgating without requiring physical guards.

Step-by-Step Solution

1
Identify the specific physical security vulnerability described in the scenario
The vulnerability is tailgating (piggybacking), where unauthorized individuals bypass physical entry authentication by closely following authorized staff.
Selecting the correct physical security measure requires matching the control to the exact attack vector.
2
Analyze the operational requirements of the target control
The requirement specifies physical enforcement of single-occupancy entry without relying on manual guard supervision.
Detection-only controls (CCTV) or identity verification controls (biometrics) fail to physically block an unauthorized person from stepping through an unlocked door.
3
Select the physical control mechanism designed for tailgating mitigation
An access control vestibule (mantrap) with interlocking doors and occupancy sensors ensures only one individual passes through at a time.
The interlocking mechanism holds the second door locked until the first door closes and single-person occupancy is validated.

Key Concept

Physical Access Control Vestibule (Mantrap)
Estimated Time:1m 30s
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Topics

Physical Security Controls

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