There are two routers RTA and RTB between the source device and the destination device. Use the Tracert command to detect the path. When the first hop RTA is detected, the source device sends a UDP…

There are two routers RTA and RTB between the source device and the destination device. Use the Tracert command to detect the path. When the first hop RTA is detected, 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 RTB, the TTL becomes 0, and the RTA responds to the source device. ICMP_______ message.