Protecting the corporate network using firewalls
To protect the internal network from external networks like the Internet, most companies employ some sort of firewall. The term came originally from building construction, where a firewall is a wall designed to segment the building and prevent, or at least hinder, the fire from spreading. Firewalls in the network security sense play a similar role in that they segment the network and prevent or hinder the spread of malicious attacks or unauthorised access.
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