Q$6.$ Compare GBN$,$ SR$,$ and TCP $($no delayed ACK$).$ Assume that the timeout values for all three protocols are sufficiently long such that five consecutive data segments and their corresponding ACKs can be received $($if not lost in the channel$)$ by the receiving host $($Host B $)$ and the sending host $($Host A $)$ respectively. Suppose Host A sends five data segments to Host B$,$ and the

COMP$3234/$ELEC$3443$ Written Assignment $1$

second segment $($sent from $\backslash ($ A $\backslash ))$ is lost. In the end, all five data segments have been correctly received by Host B$.$

a$.$ How many segments has Host A sent in total and how many ACKs has Host B sent in total? What are their sequence numbers? Answer this question for all three protocols.

b$.$ If the timeout values for all three protocol are much longer than $5$ RTT$,$ then which protocol successfully delivers all five data segments in shortest time interval?