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A firewall is a set of related programs,located at a network gateway server,that protects the resources of a private network from users from other network (yhe term also implies the security policy that is used with the programs.)

Basically,a firewall,working closely with a router program,examines each network packets to determine whether forward it towards its destination.a firewall also includes or work with a proxy server that makes network request on behalf of workstation users.

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12y ago

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