(The collected classifications, definitions, and faults of firewalls, as well as various deployment methods, physical barriers, etc. Packet Filtering Firewall: A packet filtering firewall is usually a router capable of filtering certain content packets. The information that a packet filtering firewall can detect includes layer 3 information (IP) and sometimes layer 4 information (port). For example, Cisco routers with extended ACLs can filter Layer 3 and Layer 4 information. . . . .
firewall.docx)
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