a. b. Before the advancements in packet switching, message switching acted as an efficient substitute for circuit switching. In message switching, each router waits until it receives the entire message. Once it receives the complete message it delivers the whole message over the next link. Now suppose Alice wants to send a message that is M bits long to Bob. When message-switched, all M bits are sent as a unit, whereas for packet switching the M bit message is broken up into k packets. There are total N routers between Alice and Bob. The bandwidth between Alice and Bob is R(bits/s). Ignore propagation delay, Answer question b-g based on this scenario. What's the total time for delivering the message in message switching? What's the total time for delivering the message in packet switching? Suppose now for both message switching and packet switching, each datagram delivered have an h(bits) header. You can view the whole message as one datagram in message switching and each packet as one datagram in packet switching. In which circumstances do the above two switching technologies have the same end-to-end delay? C. Suppose you and your colleagues plan to run a company after graduation. Your d. company mainly provides real-time services such as audio and video streaming, distributed games, etc. Would you propose an Internet design based on packet switching or circuit switching? Why?