Certified Revenue Control Technician (CRCT)

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During a routine system check, a technician notices that the access control panel for the main entrance is not responding, and the door is failing-safe (unlocked). A power check confirms the panel is receiving electricity. What is the most likely cause of the failure?

A software bug requiring a system-wide reboot A damaged credential reader at the door A communication failure between the control panel and the central server A faulty locking mechanism in the door itself

Correct Answer:

A communication failure between the control panel and the central server

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