Problem 3 Suppose two hosts, A and B, are separated by 22,400 kilometers and are connected by a direct link of R = 2Mbps. Suppose the propagation speed over the link, s is 2.5*108 meters/sec. Part I. (10 pts) 1. Calculate the bandwidth-delay product, R* dprop 2. Consider sending a file of 800 kilobits from host A to host B. suppose the file is sent continuously as one large message. What is the maximum number of bits that will be in the link at any given time? 3. Provide your interpretation of the bandwidth-delay product. Part II. (10 pts) 4. What is the width (in meters) of a bit in the link? Is it longer than a football field? 5. Derive a general expression of the width of a bit in terms of the propagation speed s, transmission rate R, and the length of the link m. Part III. (10 pts) 6. How long does it take to send the file, assuming it is sent continuously? 7. Suppose now the file is broken up into 20 packets. Suppose each packet should be acknowledged by the receiver first, and the sender cannot send next packet until Ack packet is received. Suppose an Ack packet is 10 bytes long and its processing time is negligible. How long does it take to send the entire file to host B? Part IV. (10 pts) 8. Now suppose you can modify R. For what value of Ris the width of a bit as long as the length of the link? 9. Now, suppose R = 1 Gbps. What is the bandwidth-delay product? 10. And what is the width (in meters) of a bit in the link