4. Consider a full-duplex transmission link which is 500 km long and has a transmission speed of 100 Mbps in both directions. The propagation delay is 5 msec. per 1000 km. The Stop-and-Wait protocol is being used to transmit data packets which are 2,000 bits long in one direction. You may assume that ACKs returned in the opposite direction are small in size so their transmission time can be ignored. You may also ignore processing times and queuing delays for both data packets and ACKs. a) b) c) d) e) Compute the one-way propagation delay. Compute the time to transmit a packet. Compute RTT, the round-trip delay. Calculate the utilization of the protocol. What is the round-trip Bandwidth-Delay product? Now compute the utilization from the Bandwidth-Delay product and the packet length. g) If everything else is the same as above, what would be the length of the link for the utilization to be 0.01? If everything else is the same as above, how long should the data packets be for the utilization to be 0.5 h)