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CISSP Training Kit by David R. Miller

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Physical security in a layered defense model

Physical security is applied to an environment as a layer in a layered defense model. This layered methodology ensures that the organization is not relying solely on one specific area of security; that can leave other areas vulnerable to compromise. A layered physical defense also ensures that if the organization is the target of an attack, whether logical or physical, the attacker must get through multiple levels of security to reach any critical information. If a single security mechanism fails or is breached, the other measures would continue to protect the asset. The first layer of a layered defense model should reside on the perimeter and apply additional layers as you move inward toward the valuable ...

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