Multi-layer · No single point of failure

Defense-in-Depth

Layer people, process, and technology controls so that failure of any one layer does not equal compromise of the whole.

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What it is

Defense-in-depth (DiD) is a strategy of complementary security layers. If phishing bypasses awareness training, email security and MFA still stand; if a host is compromised, segmentation and EDR limit blast radius. Hover the stack on the right to explore typical layers.

Design principles

  • Diversity of controls—avoid homogeneous failure modes
  • Least privilege and segmentation between layers
  • Visibility that spans layers (centralized logging and correlation)
  • Regular testing that assumes outer layers will fail