Assume that two communicating hosts A and B are using Go$-$Back$-$N as an

underlying transport layer protocol with window size N $=5$ and sequence number in range

$[1$; $20].$ Further, assume that A has $14$ segments $($numbered from $1$ to $14)$ to transmit to

B$.$ If every $7$th transmitted segment of A is lost on the way, then$(35$ pts$)$ Assume that two communicating hosts A and $B$ are using Go$-$Back$-$N as an

underlying transport layer protocol with window size $N=5$ and sequence number in range

$1$;$20.$ Further, assume that A has $14$ segments $($numbered from $1$ to $14)$ to transmit to

$B.$ If every $7^{th}$ transmitted segment of $A$ is lost on the way, then

a$)$ how many packets should the sender transmit in total $($including retransmitted pack$-$

ets$)?$

b$)$ which packet$($s$)$ should be retransmitted?

Draw a figure that shows the process of segment exchanges between A and B to visually

show your answers for the two questions above.