Definitions of the DMZ on the firewall

A dmz is an intermediate zone between a military zone and a public zone. A dmz zone configured on a FW is logically and physically separated from internal and external networks.
Devices that provide network services for external users are deployed in a dmz zone. These devices include WWW and FTP servers. The servers run security risks if they are placed on an external network. If the servers are placed on an internal network, their security vulnerabilities may provide an opportunity for external malicious users to attack the internal network. The dmz zone is developed to solve the preceding problems.

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