In today’s networking environment in which corporate networks are connected to the Internet – inviting hackers to attempt unauthorized access to valuable business information – a corporate firewall is essential. More generally, a firewall is any system that controls communication between two networks. Firewalls are usually dedicated machines running at the gateway point between your local network and the outside world, and are used to control who has access to your private corporate network from the outside – for example, over the Internet. We call a Firewall to any system or device that allows safe network traffic to pass while restricting or denying unsafe traffic. Definition of FIREWALL in Network Encyclopedia.
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