What Is a Perimeter Firewall?

A perimeter firewall is a security application that acts as a boundary and the first line of protection between a private and public network. The firewall typically resides on a network’s edge, filters malicious traffic, prevents unauthorized access, and protects internal and external networks.

This type of firewall can filter both internal and external traffic. It can analyze data packets to determine if it carries any threats. Typically, it is combined with other security measures to create a fortified network security plan.