a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet.

 a firewall is a network security system that monitors and controls

 incoming and outgoing network traffic based on predetermined security

 rules. A firewall typically establishes a barrier between a trusted 

 network and an untrusted network, such as the Internet.

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