Which access control function keeps a door unlocked for a certain amount of time after a valid authentication?

Which access control function keeps a door unlocked for a certain amount of time after a valid authentication?

• A. Momentary unlock
• B. Permanent unlock
• C. Timed access bypass
• D. Door hold open longer

Answer: (A)

After valid authentication, the system unlocks the door for a short, predefined interval and then re-locks. This is momentary unlock. It lets the user pass without extra steps while keeping security intact by not leaving the door open. A permanent unlock would keep the door open indefinitely, which is insecure. A timed access bypass suggests bypassing normal controls, not the standard post-authentication behavior. A door hold open longer implies a longer open period not specifically tied to the authentication event, which can undermine security as well.

After valid authentication, the system unlocks the door for a short, predefined interval and then re-locks. This is momentary unlock. It lets the user pass without extra steps while keeping security intact by not leaving the door open. A permanent unlock would keep the door open indefinitely, which is insecure. A timed access bypass suggests bypassing normal controls, not the standard post-authentication behavior. A door hold open longer implies a longer open period not specifically tied to the authentication event, which can undermine security as well.