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 a larger port of the destination device. When the packet reaches the intermediate hop, the TTL will change to 0, so the device sends a message to the source device. Respond to an ICMP______ message.

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 a larger port of the destination device. When the packet reaches the intermediate hop, the TTL will change to 0, so the device sends a message to the source device. Respond to an ICMP______ message.
A . Time Exceeded
B . Echo Request
C . Echo Reply
D . Port Unreachable

Answer: A