Access Control Systems & Surveillance Flashcards
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Read the first 7 Access Control Systems & Surveillance flashcards as text
A stairwell door equipped with an electromagnetic lock must allow free egress during a fire alarm. Which locking configuration does this require?
Answer: Fail-safe
A fail-safe lock releases when power is removed, so occupants can exit during a fire or power loss as life-safety codes require.
Which device on a controlled door reports to the access control panel whether the door is physically open or closed?
Answer: Door position switch
A door position switch (door contact) monitors the door's state, so the system can detect door-forced and door-held-open events.
An employee badges into a secured area, then passes the card back to a coworker, who uses it to enter as well. Which feature is designed to stop this?
Answer: Anti-passback
Anti-passback rejects a credential that is presented for entry again without first being used to exit.
On a biometric system, raising the sensitivity threshold usually has which effect?
Answer: Lowers FAR and raises FRR
A stricter threshold lets fewer impostors through (lower FAR) but rejects more legitimate users (higher FRR).
Which camera feature is best for capturing usable images of a lobby entrance when bright sunlight comes in from behind the people walking in?
Answer: Wide dynamic range (WDR)
WDR balances very bright and very dark areas in the same scene, so subjects with strong backlighting are not reduced to silhouettes.
Which access control approach physically stops tailgating at a high-security entrance by letting only one person through per authorization?
Answer: Mantrap or security vestibule
A mantrap uses two interlocked doors so only one authorized person can move through at a time.
A guard sees a 'door forced open' alarm, but no card was read and the request-to-exit device did not trigger. What does this most likely mean?
Answer: Possible unauthorized entry or a failed door contact
A door opening with no valid credential and no REX signal means either an intrusion or faulty hardware, and it should be investigated.
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