Consider a sliding window protocol operating at the data link layer between two stations 1000
kilometers apart, directly connected by an error-free 1.0 Mbps link. The frame sizes used are
500 bits, of which 50 bits are header and 450 bits are data. Ack frames are 100 bits, and frame
processing time is 100 microseconds. Assume that the signal propagation delay is 10 µsec/km.
If a window size of W = 10 is used, then the efficiency of the channel is
