Defense in Depth

Summary

Layering multiple independent security controls so no single point of failure compromises the whole system — if one layer fails, another is there to catch the attack.

• 1Diagram a defense-in-depth architecture for a hypothetical web application with at least 4 layers.
• 2Learn why relying on a single strong control (like just a firewall) is a common but risky mistake.
• 3Identify the layers present (or missing) in a real system you're familiar with.