What is the purpose of a DMZ in network security?

The purpose of a DMZ (Demilitarized Zone) in network security is to act as a buffer zone that separates an internal network from external networks, while allowing certain services to be accessible to the outside world. This design provides a layer of security by creating a controlled environment where services that need to be accessible from the internet, such as web servers, email servers, or any other public-facing applications, can be placed.

By positioning these services in the DMZ, organizations can protect their internal network from direct exposure to external threats. If an attacker were to compromise a server in the DMZ, they would still face additional security measures before accessing the internal network. This layered security helps reduce the risk of unauthorized access to sensitive data and critical internal systems.

The other options do not capture the full intent of a DMZ as effectively. While isolating the internal network is a component of the DMZ's purpose, the key aspect is providing a secure area for external-facing services. Enhancing the speed of internal network communications and providing secure access to management interfaces are important but are not primary functions of a DMZ.