A firewall is a set of related programs, located at a network gateway server, that protects the resources of a private network from users from other networks.
(The term also implies the security policy that is used with the programs).
An enterprise with an intranet that allows its workers access to the wider Internet installs a firewall to prevent outsiders from accessing its own private data resources and for controlling what outside resources its own users have access to.
A firewall also includes or works with a proxy server that makes network requests on behalf of workstation users.
For mobile users, firewalls allow remote access in to the private network by the use of secure logon procedures and authentication certificates.
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