The packet-filtering firewall allows only a particular packet with a particular source, destination, and port address to enter through the firewall.

Dynamic packet-filtering firewall.            

Explanation:

Packet filtering is basically a technique of scanning and filtering the network data packets. This technique allows or disallows the network packets to enter through the firewall or to transmit from one network to the other. Dynamic packet filtering packet-filtering firewall allows only a particular packet with a particular source, destination, and port address to enter through the firewall. It utilizes the information in packet header and inspects and utilizes active connections state information. This information enables to decide which packet should enter through the firewall.

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