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According to security design principles, which physical security control would typically be implemented first in a defense-in-depth approach for facility protection?
Motion detector
CCTV system
Fence
Access control roster
A fence represents the first layer in a defense-in-depth physical security strategy. It establishes the legal property boundary and creates the initial obstacle that intruders must overcome. While not impenetrable, fences provide visual deterrence, delay unauthorized access, and channel foot traffic to designated entry points where additional controls can be applied. In contrast, CCTV systems are monitoring tools that provide surveillance but don't physically restrict access. Motion detectors are typically deployed as detection mechanisms after the perimeter has been established. Mantrap doors are access control mechanisms used at specific entry points within a facility rather than establishing the initial security perimeter.
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