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1.3.1. Defense in Depth
Think of a medieval castle: walls, moat, guards, locked doors, and a keep. Each layer slows attackers and provides time to respond. Azure networks work the same way.
Azure Security Layers:
Each Layer's Role:
| Layer | What It Protects | Key Capability |
|---|---|---|
| DDoS Protection | Edge | Volumetric attack mitigation |
| Azure Firewall | Network perimeter | Centralized policy, FQDN filtering |
| NSG (Subnet) | Subnet traffic | Stateful packet filtering |
| NSG (NIC) | Individual VM | Fine-grained VM protection |
| WAF | Applications | OWASP rule enforcement |
Written byAlvin Varughese
Founder•15 professional certifications