CompTIA Network+ Practice Test 2026 – Comprehensive Exam Prep

The primary function of an access control vestibule is to allow only one person in at a time to prevent tailgating. This setup serves as a security measure, ensuring that unauthorized individuals cannot gain access to a secure area by following closely behind someone who has legitimate access. By controlling entry in this manner, organizations can maintain tighter security and ensure that each person entering a sensitive area is authorized to do so.

This method helps in upholding a proper level of access control, as it is crucial to prevent tailgating, which could lead to breaches in security protocols. In contrast, allowing multiple individuals to enter at once would increase the risk of unauthorized access, monitoring network traffic is not related to physical security controls, and while restricting access to authorized users is important, the specific function of an access control vestibule focuses on regulating the entry process to prevent tailgating effectively.