(8 pts) Assume we have the following network where each link is 100m long and has a transmission rate of 1Gbps. Assume that the propagation speed is 2108m/s and all packets size is 1000B. a. How long will a packet sent from A to get to B take? b. Assume host A generates 50 packets instantly. How long will the first packet wait in A's queue before being transmitted? How long will the 50th packet wait in A's queue before being transmitted? You can assume that no other packets are sent. c. Suppose now that host A closed the previous connection and starts sending 300 packets every 0.1s. What is the throughput it achieves, assuming no packet losses? d. If the transmission rate of the link between Y and Z changed to 10Mbps. What is the maximum throughput that host A can achieve? If A tries to transmit packets at a higher rate, what will happen? Explain