220-1102 Question 313
Single answerAccess control vestibuleA company is upgrading physical security for a small server room that stores payroll and customer data. Management wants to reduce the risk of tailgating, so only one authenticated person can enter the secured area at a time. Which of the following should the technician recommend?
- A
Access control vestibule
- B
Smart card reader
- C
Video surveillance system
- D
Bollards
Show answer and explanation
Correct answer: A
Explanation
The best answer is access control vestibule. In A+ Core 2 objectives covering physical security controls, an access control vestibule is specifically used to restrict entry so that users are admitted individually, which helps prevent piggybacking and tailgating. Smart card readers, cameras, and other security controls can support access management, but they do not by themselves provide the same physical enforcement of single-person entry. This aligns with common security best practices of layering controls: use authentication methods such as badges or biometrics together with a physical barrier like a mantrap for sensitive areas such as server rooms and data centers.
- A. Correct.
Correct. An access control vestibule, often called a mantrap, is designed to allow one person to pass through a secured entry sequence at a time after authentication. This directly addresses tailgating by controlling and isolating entry between two interlocking doors.
- B. Incorrect.
Incorrect. A smart card reader is an authentication device, but by itself it does not prevent an unauthorized person from following closely behind an authorized user. It helps verify identity, but it does not enforce single-person entry the way an access control vestibule does.
- C. Incorrect.
Incorrect. Video surveillance can deter misconduct and provide evidence after an incident, but it does not physically stop tailgating in real time. It is a useful compensating or supplemental control, not the best primary control for the stated requirement.
- D. Incorrect.
Incorrect. Bollards are physical barriers used to stop or redirect vehicles and protect building perimeters. They are not intended to control one-person-at-a-time pedestrian access to a secure room.