A branch office's network closet has repeated unauthorized access issues after staff badge in and hold the door for others. Management wants a control that allows one person through after valid badge use and helps prevent tailgating. Which control is best?

Closed-circuit television cameras, because they record the doorway for later review.

Cameras help with investigation, but they do not physically prevent two people from entering together.

A motion sensor, because it can detect movement inside the room.

Motion sensors can alert staff, but they do not control access or stop someone from following another person in.

A door closer, because it ensures the door automatically shuts after use.

A door closer improves door position control, but it does not reliably prevent a second person from entering behind someone.

What does this SY0-701 question test?

OSPF neighbours must agree on key parameters.

What is the correct answer to this question?

The correct answer is: A mantrap, because it physically restricts entry to one person at a time. — A mantrap is the best control because it creates a two-door entry area that lets only one person pass at a time after authentication. That makes it effective against tailgating, which is the exact problem described. In a sensitive area like a network closet, physical barriers that enforce single-person access are stronger than monitoring-only controls. Why others are wrong: Cameras are useful for evidence and deterrence, but they do not stop unauthorized entry. Motion sensors only detect movement after the fact, so they do not prevent tailgating. A door closer may reduce door-hold issues, but it does not enforce one-person-at-a-time access like a mantrap does.

What should I do if I get this SY0-701 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.