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In computing, a firewall is a network security system that controls the incoming and outgoing network traffic based on an applied rule set. A firewall typically establishes a barrier between a trusted, secure internal network and another network (e.g., the Internet) that is assumed not to be secure and trusted.[1]

Software firewalls are server-based and form the last-line of defence for server infrastructure. Routers, Hardware firewalls, the DMZ, AirGaps, Proxies are other perimeter defence mechanisms.