Certified Information Systems Security Professional (CISSP) Practice Exam

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Question: 1 / 1980

Which of the following best describes a passive motion detector?

It requires user interaction to function

It detects motion using physical pressure sensors

It relies on infrared energy emitted by objects

A passive motion detector is designed to detect motion by sensing changes in infrared energy emitted from objects in its field of view. When an object, such as a person or heat source, moves within that area, the detector recognizes variations in the infrared radiation levels. This means that the detector works without actively sending out signals or requiring any interactions from users, which is a key characteristic of passive systems.

In contrast to choices that suggest user interaction or the use of physical pressure sensors, passive motion detectors do not rely on those methods. They also differ from options that imply the use of visual cameras, as those would typically fall under active detection methods that can include image processing or video analytics. Therefore, it is the reliance on infrared energy that accurately depicts the operation of a passive motion detector.

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It monitors through visual cameras

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