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Defense in depth.

also: defence in depth · layered security

Several independent layers of security controls (perimeter, network, application, data, monitoring), so one failure isn't a breach.

the two-minute refresher

Perimeter: WAF, DDoS protection, rate limits.
Network: VPCs, security groups, private subnets for databases.
Application: authentication, authorization, input validation. Data: encryption and key management.
Monitoring: audit logs and anomaly detection catch what got through.

Where the course teaches it

W09 · Day 5Security Architecturelearn it →

Related concepts

Zero trust
Principle of least privilege
Threat modeling