Foundation glossary/Principles
Defense in Depth
Companion card for the Foundation course — study the related lesson for full progress.
Simple explanation
Many layers so one failure is not total failure.
Technical explanation
Stack controls across network, host, identity, app, data.
Real-life scenario
Door lock + CCTV + alarm — same idea for Gmail MFA + anti-phishing + backups.
Security relevance
Single controls fail; layered defenses keep one miss from becoming a breach.
Practical example
WAF + parameterized queries + least-privilege DB user.
Network
Host
Identity
App
Data
Mini quiz
WAF + parameterized queries + least-privilege DB is an example of:
Related lesson
No direct lesson slug yet — use the Foundation course syllabus or roadmap level security-fundamentals.