Demilitarized zone

In computer security, in general a demilitarized zone (DMZ) or perimeter network is a network area (a subnetwork) that sits between an organization's internal network and an external network, usually the Internet. DMZ's help to enable the layered security model in that they provide subnetwork segmentation based on security requirements or policy. DMZ's provide either a transit mechanism from a secure source to an insecure destination or from an insecure source to a more secure destination. In some cases, a screened subnet which is used for servers accessible from the outside is referred to as a DMZ.

A screened (firewalled) network segment that acts as a buffer zone between a trusted and untrusted network Scope Note: A DMZ is typically used to house systems such as web servers that must be accessible from both internal networks and the Internet.

An interface on a routing firewall that is similar to the interfaces found on the firewall’s protected side. Traffic moving between the DMZ and other interfaces on the protected side of the firewall still goes through the firewall and can have firewall protection policies applied.

A host or network segment inserted as a “neutral zone” between an organization’s private network and the Internet.

a zone from which military forces or operations or installations are prohibited

DMZ: Demilitarized Zone