Packet filtering is usually an effective defense against attacks from computers outside a local area network (LAN). However, other packet filters can memorize previously used packet items, such as source and destination IP addresses. Some packet filters are not intelligent and unable to memorize used packets. ![]() Packet filters also verify source and destination port addresses. Because the sender may use different applications and programs, packet filtering also checks source and destination protocols, such as User Datagram Protocol (UDP) and Transmission Control Protocol (TCP). ![]() If both IP addresses match, the packet is considered secure and verified. Packet filtering checks source and destination IP addresses. ![]() Once matched, a packet is either accepted or denied. During network communication, a node transmits a packet that is filtered and matched with predefined rules and policies.
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