Anti-tailgating is typically implemented using which combination?

• A. Sensors, hold-open time control, and controlled exit devices
• B. Only CCTV cameras
• C. Only entry door alarm
• D. Only a single credential policy

Answer: (A)

Anti-tailgating relies on layering detection, timing control, and exit hardware to prevent unauthorized entry. Sensors provide real-time data about who is passing through a secured door, counting or detecting when more than one person goes through on a single credential and flagging potential tailgating events. Hold-open time control sets a strict window for how long the door can stay open after a valid entry, reducing opportunities for someone to slip through during a prolonged open state. Controlled exit devices enforce secure exit behavior, ensuring that leaving is monitored and synchronized with entry so that the door doesn’t remain usable for others once a legitimate user has passed. This combination creates a proactive, enforceable barrier that cameras or alarms alone cannot achieve, and a single credential policy cannot adapt to or prevent tailgating in real time.