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Difficulty: HardPhysical Security Controls and Environmental Measures

An infrastructure engineer is designing physical access controls for a high-security data center hall. The facility security policy mandates a mechanism that strictly prevents tailgating (piggybacking) during employee entry. Additionally, in the event of a total facility power outage, exterior access doors must default to a locked state to maintain perimeter security against intruders, while personnel remaining inside the room must be able to exit safely without active electrical power. Which combination of physical access controls best satisfies all specified operational and safety requirements?

  1. Deploy an access control vestibule (mantrap) equipped with fail-secure electronic locks on the exterior entry door and fail-safe mechanical crash bars on the interior exit pathway.Answer
  2. B
    Deploy an access control vestibule (mantrap) configured with fail-safe magnetic locks on both exterior and interior doors triggered exclusively by passive infrared motion sensors.
  3. C
    Install dual-factor biometric readers on a single standard perimeter door fitted with an electrified fail-safe strike plate.
  4. D
    Install optical turnstile barriers using fail-safe drop-arm mechanisms connected directly to main electrical power circuits.

Answer

Deploying an access control vestibule (mantrap) with fail-secure electronic locks on the exterior entry door and fail-safe mechanical crash bars on the interior exit pathway meets all security and emergency safety requirements.
An access control vestibule (mantrap) provides the physical interlocking control required to detect and eliminate tailgating. Using fail-secure locks on the outer entrance guarantees that loss of facility power will not unlock the door to outside intruders. Equipping the interior door exit with mechanical fail-safe hardware ensures personnel can escape during emergency power failures in compliance with safety standards.

Step-by-Step Solution

1
Analyze anti-tailgating control requirements.
Identify that an access control vestibule (mantrap) with interlocking doors is required to physically restrict access to one individual at a time.
Single doors or open turnstiles allow unauthorized individuals to follow authorized personnel closely.
2
Determine power-failure lock behavior for perimeter security.
Select fail-secure locking hardware for exterior doors.
Fail-secure locks require continuous power to remain unlocked; upon loss of power, they default to a locked state, preventing exterior intruders from entering.
3
Determine egress mechanisms for life-safety compliance.
Select fail-safe mechanical crash bars or unlatching handles for internal egress.
Building and fire safety codes require that occupants inside a facility can exit unhindered without requiring active electrical power or specialized knowledge during an emergency.

Key Concept

Physical Access Control Mechanisms, Mantraps, and Fail-Safe vs. Fail-Secure Lock Operations
Estimated Time:2m 0s
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Topics

Physical Security Controls and Environmental Measures

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