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+# Cloudflare DDoS Protection
+
+Autonomous, always-on protection against DDoS attacks across L3/4 and L7.
+
+## Protection Types
+
+- **HTTP DDoS (L7)**: Protects HTTP/HTTPS traffic, phase `ddos_l7`, zone/account level
+- **Network DDoS (L3/4)**: UDP/SYN/DNS floods, phase `ddos_l4`, account level only
+- **Adaptive DDoS**: Learns 7-day baseline, detects deviations, 4 profile types (Origins, User-Agents, Locations, Protocols)
+
+## Plan Availability
+
+| Feature | Free | Pro | Business | Enterprise | Enterprise Advanced |
+|---------|------|-----|----------|------------|---------------------|
+| HTTP DDoS (L7) | ✓ | ✓ | ✓ | ✓ | ✓ |
+| Network DDoS (L3/4) | ✓ | ✓ | ✓ | ✓ | ✓ |
+| Override rules | 1 | 1 | 1 | 1 | 10 |
+| Custom expressions | ✗ | ✗ | ✗ | ✗ | ✓ |
+| Log action | ✗ | ✗ | ✗ | ✗ | ✓ |
+| Adaptive DDoS | ✗ | ✗ | ✗ | ✓ | ✓ |
+| Alert filters | Basic | Basic | Basic | Advanced | Advanced |
+
+## Actions & Sensitivity
+
+- **Actions**: `block`, `managed_challenge`, `challenge`, `log` (Enterprise Advanced only)
+- **Sensitivity**: `default` (high), `medium`, `low`, `eoff` (essentially off)
+- **Override**: By category/tag or individual rule ID
+- **Scope**: Zone-level overrides take precedence over account-level
+
+## Reading Order
+
+| File | Purpose | Start Here If... |
+|------|---------|------------------|
+| [configuration.md](./configuration.md) | Dashboard setup, rule structure, adaptive profiles | You're setting up DDoS protection for the first time |
+| [api.md](./api.md) | API endpoints, SDK usage, ruleset ID discovery | You're automating configuration or need programmatic access |
+| [patterns.md](./patterns.md) | Protection strategies, defense-in-depth, dynamic response | You need implementation patterns or layered security |
+| [gotchas.md](./gotchas.md) | False positives, tuning, error handling | You're troubleshooting or optimizing existing protection |
+
+## See Also
+- [waf](../waf/) - Application-layer security rules
+- [bot-management](../bot-management/) - Bot detection and mitigation