Firewall

A firewall is a network security device or software that serves as a barrier between a trusted internal network and untrusted external networks, such as the internet. Its primary function is to control and manage incoming and outgoing network traffic based on predetermined security rules. The goal of a firewall is to prevent unauthorized access, protect sensitive data, and mitigate potential cyber threats.

Firewalls operate at different layers of the network, including the application layer, transport layer, and network ____ _______ __________ ________ __________ __________ ______.
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