Question 3: Suppose Host Alice is connected to Host Bob by three routers R1, R2 and R3. Also, suppose that Host Alice wishes to send a large file of 10MB to Host Bob. The path from Host Alice to Host Bob has four links of rates 1Mbps,2Mbps,10Mbps, and 1 Mbps, respectively. [3 Marks] a. Draw the network architecture described above. Label the hosts, routers and show the link transmission rates. b. What is the throughput of the file transfer between host Alice and Host Bob? c. By dividing the file size by the throughput (from b), roughly how long will it take to transfer the file from Host Alice to Host Bob? d. Assume that the second link between R1 and R2 is shared between the current file transfer and 9 other simultaneous file transmissions, what is the throughput for the current file transfer between Host Alice and host Bob? How long will it take to transfer the file from Host Alice to Host Bob? e. Given the propagation speed 3108m/s for all four links and distances of links (E-R1) and (R3-Bob) is 1km while the distance of link (R1-R2) is 20km and also, the distance between (R2-R3) is 20km, what is the end-to-end delay for transferring a file of 20MB ? f. Assume that an intervening router, R, is added at the middle of the distance between R1 and R2, what is end-to-end delay for transferring a file of 10MB? What is the effect of adding R to the network? Explain your