When the router xe-0-0-1.core-910.frgp. net drops the ip datagram enclosing a UDP segment from my computer, does it send a UDP segment or an ICMP message to the host? What are the type and code of router enclosed in such UDP segment or ICMP message? What’s the source IP in the IP datagram carrying this UDP/ICMP packet? Whose IP is used as the destination IP for this UDP/ICMP packet? (hint: websever’s, my computer’s, router 147.153.69.30’s, or …?)