A firewall is a system designed to prevent unauthorized access to or from a computer or private network. A firewall can be implemented in both hardware and software, or a combination of both. They are frequently used to prevent unauthorized Internet users from accessing computers or private networks connected to the Internet. All messages entering or leaving the computer or private network pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.

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by leevis edited by KeysCapt
last modified: 2004-01-31 10:09:43