![]() 1 under Firewall A firewall is a device that has a network protection application installed to safeguard the network from intentional or unintentional intrusion. NIST SP 800-152 NIST SP 800-152 under Firewall A device or program that controls the flow of network traffic between networks or hosts that employ differing security postures. NIST SP 800-152 NIST SP 1800-27C under Firewall Source(s): NIST SP 1800-27B under Firewall RFC 4949 A part of a computer system or network that is designed to block unauthorized access while permitting outward communication. 1 under Firewall An inter-network gateway that restricts data communication traffic to and from one of the connected networks (the one said to be “inside” the firewall) and thus protects that network’s system resources against threats from the other network (the one that is said to be “outside” the firewall). ![]() ISA-6 A gateway that limits access between networks in accordance with local security policy. Firewalls generally have rules restricting which ports are open. Typically firewalls are used to define zone borders. A firewall may be either an application installed on a general-purpose computer or a dedicated platform (appliance), which forwards or rejects/drops packets on a network. An inter-network connection device that restricts data communication traffic between two connected networks.
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