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Commonly confused · Security Fundamentals & Crypto

Defense in Depth vs Zero Trust: What's the Difference?

Defense in depth layers multiple, diverse controls so that if one fails others still protect assets. Zero trust is an architecture that removes implicit trust based on network location and requires continuous verification of every user, device, and request. They complement each other.

Defense in Depth

Full definition
vs

Zero Trust

Defense in DepthZero Trust
Core ideaLayered overlapping controlsNever trust, always verify
Network perimeterOften assumes a trusted inside with layers around itNo implicit trust for inside traffic
VerificationAt various layersEvery access request, continuously
Key componentsFirewalls, IDS, AV, encryption, policies, physical securityPolicy engine, policy enforcement points, strong identity, microsegmentation
ReferenceClassic military and security strategyNIST SP 800-207
RelationshipA strategyAn architecture that applies defense in depth principles
Remember it

Defense in depth stacks walls; zero trust checks ID at every door.

Exam tip

Zero trust questions often reference the control plane (policy engine and administrator) and data plane (enforcement points), or microsegmentation. Layered and diverse controls signal defense in depth.

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