A device that forms a barrier between a secure and an open environment. Usually; the open environment is considered hostile. The most notable hostile environment is the Internet. In other words; a firewall enforces a boundary between two or more netw

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1. A device that forms a barrier between a secure and an open environment. Usually; the open environment is considered hostile. The most notable hostile environment is the Internet. In other words; a firewall enforces a boundary between two or more netw