Demilitarized Zone (DMZ)
The demilitarized zone (DMZ) is an autonomous intermediate network that is created at network transitions. The network is fully autonomous but little secured. DMZs are used for simple security gateways and are commonly created at the third interface of a packet filter. If the security gateway is used as “Application Level Gateway” (ALG) itself, another interface is engaged as DMZ. If the packet filter or the ALG has more than one interface, even further DMZs may be produced.