DMZ
A DMZ (Demilitarized Zone) is a network security concept that involves creating a separate, isolated network segment between an internal trusted network (like a corporate LAN) and an external untrusted network (like the internet). It acts as a buffer zone where public-facing servers, such as web servers or email servers, are placed to limit direct access to internal resources, thereby reducing the attack surface. This architecture helps enforce security policies by controlling traffic flow through firewalls and other security devices.
Developers should learn about DMZs when designing or securing network architectures for applications that require public access, such as e-commerce sites or cloud services, to protect sensitive internal data from external threats. It is crucial in scenarios involving compliance with security standards (e.g., PCI DSS for payment systems) or when deploying multi-tier applications where backend databases must be shielded from direct internet exposure. Understanding DMZs helps in implementing defense-in-depth strategies to mitigate risks like data breaches or unauthorized access.