CompTIA Security+ (SY0-701)General Security ConceptsMedium
A company redesigns its data center entrance so that an employee must badge into a small enclosed space, wait for the outer door to close, and then badge again before the inner door opens. What is this physical security control called?
- ABollard system
- BPerimeter fencing
- CFaraday cage
- DAccess control vestibule
Show answer & explanationAnswer & explanation
Correct answer: D. Access control vestibule
An access control vestibule (formerly called a mantrap) uses two interlocking doors to allow only one authenticated person through at a time, preventing tailgating.
Why the other options are wrong
- A. Bollards are posts used to stop vehicles, not control pedestrian entry.
- B. Perimeter fencing establishes an outer boundary but doesn't involve interlocking doors.
- C. A Faraday cage blocks electromagnetic signals and has nothing to do with physical entry control.
Access Control Vestibule
A physical security mechanism with two interlocking doors that only allows one person to pass through at a time after authentication, preventing tailgating.
- Formerly known as a mantrap
- Only one door opens at a time
- Effective anti-tailgating/piggybacking control
Memory trick: One door closes before the next opens — no tailgaters allowed.