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