What is a common problem when using vibration detection devices for perimeter control?

A.
They are vulnerable to non-adversarial disturbances.

B.
They can be defeated by electronic means.

C.
Signal amplitude is affected by weather conditions.

D.
They must be buried below the frost line.

Explanation:
A common problem when using vibration detection devices for perimeter control is false alarms. For example,
someone could lean on the fence and trigger an alarm.
Perimeter Intrusion Detection and Assessment System (PIDAS) is a type of fencing that has sensors located on
the wire mesh and at the base of the fence. It is used to detect if someone attempts to cut or climb the fence. It
has a passive cable vibration sensor that sets off an alarm if an intrusion is detected. PIDAS is very sensitive
and can cause many false alarms.
Incorrect Answers:
B: Vibration detection devices for perimeter control are not commonly defeated by electronic means. Therefore,
this answer is incorrect.
C: Signal amplitude being affected by weather conditions is not common problem when using vibration
detection devices for perimeter control. Therefore, this answer is incorrect.
D: It is not true that vibration detection devices for perimeter control must be buried below the frost line.
Therefore, this answer is incorrect.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 487