II-3. (5 pts) Consider the following network where some of the routers are IPv6 enabled, but some of them (C and D) are not. Suppose that A sends a message encapsulated in an IPv6 datagram to F. For this message, describe the IP source and IP destination addresses and content of the packet sent from C to D. II-4. (3 pts) In hierarchical routing, what is a gateway router? II-5. (8 pts) Suppose that a link between Router 1 and Router 2 has a maximum transfer unit (MTU) of 5000 bytes. Answer the following questions: (a - 3 pts) If an IPv 4 datagram of size 10000 bytes arrive to the link from Router 1 to Router 2, this datagram has to be fragmented into smaller datagrams. How many datagrams will be sent to Router 2 ? (b - 2 pts) In which node are these datagrams reassembled? (c 3 pts) If these datagram was an IPv6 datagram, what would be the action taken by Router 1