A network set up separately from an organization's private network and the Internet. The advantage of a perimeter network is that it allows external users access to specific servers located in the perimeter network, while preventing access to the internal corporate network. A perimeter network is also known as DMZ, demilitarized zone, and screened subnet.

a collection of devices and subnets that are positioned between a private network and the Internet to help protect the private network from unauthorized Internet users

an additional network between the external network and a protected internal network