A T1 link (3000-km) is used to transmit a 64-byte segments. The propagation speed of the T1 link is 1/6 km/microsec. The transmission rate for T1 link is 1.544Mbps. Please pay careful attention to the difference between propagation delay and transmission delay (a) (1 point) If using stop-and-wait protocol, calculate the utilization of the protocol. (b) (1 point) If GBN protocol is deployed, in order to achieve an efficiency of 100%, what is the maximum window size, in terms of the number of segments, at the sender's side? A T1 link (3000-km) is used to transmit a 64-byte segments. The propagation speed of the T1 link is 1/6 km/microsec. The transmission rate for T1 link is 1.544Mbps. Please pay careful attention to the difference between propagation delay and transmission delay (a) (1 point) If using stop-and-wait protocol, calculate the utilization of the protocol. (b) (1 point) If GBN protocol is deployed, in order to achieve an efficiency of 100%, what is the maximum window size, in terms of the number of segments, at the sender's side?