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Security Fundamentals & Crypto · Foundational

Physical Security

Protecting facilities, hardware, and people from physical threats such as unauthorized entry, theft, and environmental hazards.

Definition

Physical security uses layered controls: perimeter (fencing, bollards, lighting), building entry (guards, badge readers, access control vestibules), interior zones (locks, cameras), and environmental protections (fire suppression, HVAC, power). Human safety is always the top priority. Physical access often defeats technical controls.

Example

A data center uses fences, guards, badge-plus-biometric entry, and cameras at every door.

Exam tip

Safety of people comes first; know the layered order from perimeter inward.

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