SY0-701 Question 20
Single answerA company is upgrading security at a small data center after two incidents: an unauthorized person followed an employee through the main entrance, and a vehicle struck the lobby doors during a protest. The company wants to reduce tailgating and add protection against vehicle ramming while still allowing authorized staff to enter efficiently. Which combination of controls BEST addresses these requirements?
- A
Install bollards outside the entrance and replace the main door with an access control vestibule that requires badge authentication for each person entering
- B
Add brighter exterior lighting and increase video surveillance coverage of the parking lot and lobby entrance
- C
Post a security guard at the lobby desk and issue updated access badges to all employees
- D
Install ultrasonic motion sensors in the lobby and place microwave sensors along the exterior wall facing the parking lot
Show answer and explanation
Correct answer: A
Explanation
The best answer is the combination of bollards and an access control vestibule because the scenario requires preventive controls targeted at two distinct physical threats. Bollards are a standard protective measure against vehicle intrusion and are commonly used to harden entrances to offices, data centers, and government facilities. An access control vestibule or mantrap is a well-established control for reducing tailgating and piggybacking by requiring individual authentication before entry is granted. In Security+ terms, this answer aligns with selecting controls that most directly mitigate the identified risk rather than merely detecting or documenting it. By contrast, lighting, video surveillance, guards, badges, and sensors can all contribute to a layered physical security program, but they are weaker as the primary solution here because they do not provide the same level of physical prevention. This reflects common best practices in facility security design: use barriers to stop vehicles, use controlled entry points to prevent unauthorized access, and then add detective and monitoring controls as supporting layers.
- A. Correct.
Correct. Bollards are specifically designed to mitigate vehicle-based attacks or accidental impacts by creating a physical barrier between vehicles and the building. An access control vestibule, often called a mantrap, helps prevent tailgating by controlling entry so each individual must authenticate separately. This combination directly addresses both stated problems: forced vehicle approach and unauthorized piggybacking.
- B. Incorrect.
Incorrect. Lighting and video surveillance are important deterrent and detective controls, but they do not physically stop a vehicle from reaching the entrance and do not reliably prevent tailgating on their own. Cameras may record an incident after it occurs, and lighting improves visibility, but neither is the best control combination for the specific risks in the scenario.
- C. Incorrect.
Incorrect. A security guard and badges can improve access control, but this approach is more dependent on human vigilance and is less effective than a mantrap-style vestibule for consistently preventing tailgating. It also does not address the vehicle-ramming concern as directly as bollards. This is a plausible choice because guards and badges are common physical security controls, but it is not the best overall answer.
- D. Incorrect.
Incorrect. Sensors can support intrusion detection, but ultrasonic and microwave sensors are not the primary controls for stopping tailgating or mitigating vehicle impact. They may generate alerts based on movement, but they do not create a physical barrier or enforce one-person-at-a-time entry. This option confuses detection with prevention.