Cognitive Scaffold

Preparing your thinking workspace

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MENTAL MODEL · M1236

Defense in Depth

Defense in Depth
TechnicalHigh supportPhysics
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

A layered defense strategy. Instead of relying on a single line of defense (such as a firewall), it establishes multiple independent defense mechanisms (physical security, network security, host security, application security, data security). If one layer fails, the next layer can still block the attack.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Redundancy is safety. Don't put all your hopes on one point (e.g., relying only on passwords). In personal finance, defense in depth means: cash reserves + insurance + diversified investments + skill monetization ability.

anchor

Anchor fast decisions

Defense in Depth: Set up multiple independent, complementary layers of protection (boundary, network, host, application, data, personnel). If any layer fails, subsequent layers still block, reducing the risk of a single point of failure leading to overall compromise.

MINIMUM ACTION

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Defence_in_depthZH · Explicit
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