As part of planning a defense-in-depth physical security program for a new data center, the security architect must decide which control to deploy first to establish the outermost boundary before adding surveillance, sensors, and internal access controls. According to widely accepted security design principles, which control should be implemented at the beginning of the layered design?
A fence is generally the first layer in a defense-in-depth physical security strategy. It sets the legal property boundary, acts as a visible deterrent, and provides an initial barrier that delays intruders and channels pedestrian and vehicle traffic to designated entry points. CCTV systems and motion detectors are detection tools that monitor rather than physically restrict entry, while mantrap doors are interior access-control mechanisms deployed deeper inside the facility-typically at building or zone entrances-after the perimeter has been defined by a barrier such as a fence.
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Why is a fence considered the first physical security control in defense-in-depth?
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How does a fence complement other security measures like CCTV and motion detectors?
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What other perimeter-based physical controls can be used alongside a fence?
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ISC2 CISSP
Security Operations
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