III-4. (22pts) Consider the LAN scenario above. Suppose all switches are learning switches. All the ARP tables and switch tables are initially empty. Answer each question below briefly, e.g., in a sentence or two at most. a) (3 pts) Suppose that B wants to send a packet to A. Consider an ARP request sent by node B. Whose IP-to MAC address translation is being queried? b) (3 pts) What is the destination MAC address on the frame containing the ARP request? c) (4 pts) After B receives the ARP reply, what is contained in switch 3 switching table? d) (6 pts) Suppose that A has an IP address of 193.140.1.3. Subnet mask for both subnets is 22. (i) Is 193.140.2.230 a possible IP address for C? Why? (ii) Is 193.140.3.15 a possible IP address for B? Why? e) (3 pts) Now consider the frame containing the B-to-A IP datagram. What are the MAC source and destination address of this frame and the IP source and destination addresses in the encapsulated IP datagram at points (1), (2), and (3)? (For IP addresses, just say IP of A, IP of B, etc) f) (3 pts) Consider the datagram being sent from A to C; neither A nor C have sent any frames or datagrams in the network before. How many of hosts in the network receive the frame containing the datagram sent by A? Explain your answer briefly