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Definition: DMZ

(DeMilitarized Zone) A middle ground between an organization's trusted internal network and an untrusted, external network such as the Internet. Also called a "perimeter network," the DMZ is a subnetwork (subnet) that may sit between firewalls or off one leg of a firewall. Organizations typically place their Web, mail and authentication servers in the DMZ. DMZ is a military term that refers to the area between two enemies. See bastion host, firewall and opening a port.

All servers exposed to the Internet (the bastion hosts) are located in the DMZ, which is isolated from the public Internet and the private LAN by screening routers.