![]() The predecessors to firewalls for network security were routers used in the late 1980s. The term was applied in the late 1980s to network technology that emerged when the Internet was fairly new in terms of its global use and connectivity. 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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