In some instances, after examining an incoming packet, a firewall can send a message to the packet's sender that the attempt to transmit the packet has failed.

Question

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Firewalls can generate and send Internet Control Message Protocol (ICMP) messages back to the sender, indicating that a packet was not delivered for reasons such as the packet being denied by the firewall's filtering rules.

In Some Instances, After Examining an Incoming Packet, a Firewall