Consider a fiber optic cable that links two coasts of a continent. Assuming a non$-$

lossy channel with no corruption, a coast$-$to$-$coast propagation delay of $80$ms$,$ a

transmission speed of $100$Mbps$,$ and a packet size of $16$K bits. Calculate the window

size of the GBN protocol needed to achieve utilization U $=0\mathrm{.}3.$ Similarly consider a

satellite link with the same characteristics but propagation delay of $350-450$ms and

suggest which of the three protocols $($SAW$,$ GBN$,$ SR$)$ would be preferred by users of

such a link to achieve the best possible goodput. Estimate optimal window size for

U$=0\mathrm{.}35$