Defensive Security (Blue Team) / Security foundations
Lesson 4 of 32
Defence in depth
No single control is perfect, so stack layers: firewall, patches, strong logins, least privilege, monitoring and backups. An attacker who beats one layer meets the next.
Key points
- Many layers, not one wall
- Assume some layers will fail
- Backups are the last line
Quiz · +10 XP
What is defence in depth?
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