A firewall is a special computer programmed to limit, or filter, the access to internal networks. A system has a firewall around it if it only lets certain kinds of messages in and out from the rest of the Internet. If an organization wants to exchange mail through the Internet, but does not want students telnetting in and reading files, its connection to the Internet can be set up to prevent incoming telnets or FTP's. Permitted uses, such as accessing the organization's Web server, can still be allowed. For more information on firewalls, please contact your local Internet service provider.
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