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Cs source guest pass5/27/2023 ![]() ![]() This type of firewall decides whether to accept or deny individual packets, based on examining fields in the packet's IP and protocol headers. The static packet filtering firewall operates only at the network layer (layer 3) of the OSI model and does not differentiate between application protocols. Packet filtering firewalls are among the oldest firewall architectures. Jack Wiles, in Techno Security's Guide to Securing SCADA, 2008 Static Packet Filter
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