Which access-control device physically traps a trespasser between two locked doors?

• A. Man Trap
• B. Firewall
• C. Router
• D. VPN

Answer: (A)

Physical security uses a device that traps a trespasser between two locked doors to enforce identity verification before access to a restricted area. This is a mantrap. In a mantrap, you enter a small vestibule and the doors are interlocked so both can’t be open at the same time. After presenting credentials and being granted access, the system allows you to proceed by unlocking the appropriate door. If you’re not authorized, the doors stay locked, keeping you contained in that space and preventing entry or exit. This setup effectively prevents tailgating and piggybacking, ensuring only authorized personnel reach sensitive areas. The other options are network devices that control data flow and remote connections, not physical access, so they don’t trap someone between doors.