A firewall is a mechanism that keeps certain kinds of network traffic out of a private network.

Name: A firewall is a mechanism that keeps certain kinds of network traffic out of a private network.
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A firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies. Its purpose is to prevent unauthorized access to or from a private network.

A Firewall Is a Mechanism That Keeps Certain Kinds of Network