DMZ Architecture and Network Zones
Designing the battlefield — zones, trust levels, and traffic flows.
Key takeaways
- A DMZ isolates internet-facing services from the internal network.
- Zero trust challenges the idea of "trusted internal" — all traffic is verified.
- Micro-segmentation divides internal networks into smaller zones to limit lateral movement.
- Traffic between zones should be explicitly permitted — implicit deny is the default.
Traditional network architecture assumed that traffic inside the corporate perimeter was "trusted." Zero trust architecture challenges this model entirely: "Never trust, always verify."
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