Later uses refer to similar structures, such as the metal sheet separating the engine compartment of a vehicle or aircraft from the passenger compartment. The term firewall originally referred to a wall intended to confine a fire within a line of adjacent buildings. A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet. In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Security information and event management (SIEM).Host-based intrusion detection system (HIDS).
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