Question 4 (20 points) Consider the following Fig 4, where several subnets are interconnected by two routers, ie, RI and R2. RI Subre Subre Subat 2 Fig. 4 1. If the interface of Rl in subnet 2 has an IP address 192.168.2.1, assign IP addresses to all the other interfaces in subnet 2, and also, show the network mask you used for those IP addresses. (6 points) 2. Assuming the interface of A has IP address 192.168.1.2, and the adapter for that interface has MAC address aa-aa-aa-aa-aa-aa; the interface of Rl in subnet 1 has IP address 192.168.1.1, and the adapter for that interface has MAC address 11-11-11- 11-11-11. Now, consider sending an IP datagram from Host A to Host E. Suppose A has an empty ARP table, while R1 and R2 both have up-to-date ARP tables and routing tables respectively. Enumerate all the steps for sending the IP datagram (8 points) 3. If we replace the center switch (the device between Rl and R2) with a router R3, then how many subnets are in this figure? List them. (6 points)