Suppose Host E is connected to Host U by two routers R1 and R2 and Host E wishes to send a large file of 10 MB to Host U. The path from Host E to Host U has three links of rates 2 Mbps, 3 Mbps, and 5 Mbps, respectively.

1. Draw the network architecture described above. Label the hosts, routers and show the link transmission rates.
2. What is the throughput of the file transfer between host E and Host U?
3. By dividing the file size by the throughput (from b), roughly how long will it take to transfer the file from Host E to Host U?
4. Assume that the second link between R1 and R2 is shared between the current file transfer and 19 other simultaneous file transmissions, what is the throughput for the current file transfer between host E and host U? how long will it take to transfer the file from Host E to Host U?
5. Given the propagation speed 2.5 10⁸ m/s for all three links and distances of links (E-R1) and (R2-U) is 10 km while the distance of link (R1-R2) is 50 km, what is the end-to-end delay for transferring a file of 10 MB? What is the end-to-end delay for transferring a file of 20 MB?
6. 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 answer.