What is a fire wall?

My question is what is a fire wall and how does it work...Thanks in advance

This question was answered on January 30, 2004. Much of the information contained herein may have changed since posting.

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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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Posted by Student of Katharine Gibbs School - New York on January 30, 2004

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