7. Sequence numbers.

(a) In a sliding window protocol with RWS=SWS=5, a very large set of possible sequence numbers (assume no wrapping), and in-order packet arrivals, why can the receiver be assured -3- that it will never again receive the frame with sequence number 10 if it is currently expecting frame 17?

(b) For the sliding window protocol, if the senders window size (SWS) equals the receivers window size (RWS), what is the minimum number of sequence numbers that are required? How many bits must be reserved in the packet header for sequence numbers?

c) For the go-back-N protocol with N, the send window size, equal to 8, what is the smallest number of sequence numbers that are needed to ensure reliable delivery of the frames?