There are two hops from the source device to the destination device. Use the tracert command to detect the path. When detecting the first hop, the source device sends a UDP packet with a TTL of 1 to the intermediate hop; when detecting the second hop, the source device sends a UDP packet with a TTL of 2. The packet reaches the intermediate hop first, and the TTL decreases. is 1. When the packet reaches the destination, the TTL will be decremented to 0. At this time, the destination device will send an ICMP______ message to the source to inform the source device that it has tracked the destination address.

There are two hops from the source device to the destination device. Use the tracert command to detect the path. When detecting the first hop, the source device sends a UDP packet with a TTL of 1 to the intermediate hop; when detecting the second hop, the source device sends a UDP packet with a TTL of 2. The packet reaches the intermediate hop first, and the TTL decreases. is 1. When the packet reaches the destination, the TTL will be decremented to 0. At this time, the destination device will send an ICMP______ message to the source to inform the source device that it has tracked the destination address.
A . Time Exceeded
B . Echo Request
C . Echo Reply
D . Port Unreachable

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Answer: D