QUESTION A)

Assuming that a flag of 01111110 is used for data transmission, show how the hexadecimal data F84E8 expressed in binary is framed.

QUESTION 2)

Consider a link in which the probability of error on the forward path is p=0.001 and

the probability of error on the return path is q=0.005. The processing delay is

negligible at both sender and receiver. The link is 1 km in length, in which the signal

propagation speed is approximately 2*108 m/s. Frames in the forward direction are

2000 bits long; return frames carrying ACK or NAK are 200 bits long. The

transmission rate in both directions is 100Mbps. Assume that TIMEOUT is chosen

optimally and that the window size is large enough to allow the sender to transmit

frames continuously in the absence of errors.

2) How could throughput and efficiency respectively be improved?