Which of the following is a private network 'neutral zone' that sits between a private LAN and the public internet and is used to expose certain servers to the internet (such as web-servers and mail-servers) without exposing the actual private LAN.

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A DMZ, or Demilitarized Zone, is a separate, neutral segment that sits between a private LAN and the public Internet. It’s designed to host publicly accessible servers (like web and mail servers) so they can be reached from outside without exposing the internal network itself. By placing those servers in the DMZ and keeping the private LAN behind additional firewalls, you create a controlled buffer: traffic from the Internet goes to the DMZ, the DMZ servers handle those requests, and only limited, tightly regulated communications are allowed back to the internal network. If a DMZ server is compromised, the attacker still faces the protective barriers before they can reach critical internal resources.

This is different from a virtual private network, which is about securely connecting remote users to the LAN; from network address translation, which mainly hides internal addresses rather than exposing any servers; and from a proxy server, which can mediate client requests but doesn’t by itself define a separate zone for publicly exposed services.