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Security Fundamentals & Crypto · Foundational

Layered Security

Synonym for defense in depth: multiple overlapping security measures protecting the same asset.

Definition

Layered security places independent controls at multiple points so that one failure does not lead to compromise. Layers typically include perimeter, network, endpoint, application, and data controls along with policies and monitoring. The term is used interchangeably with defense in depth on most exams.

Example

Email is protected by a secure email gateway, endpoint antivirus, and user phishing training.

Exam tip

Treat layered security and defense in depth as the same concept.

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