Suppose there is exactly one packet switch between a sending host and a receiving host. The transmission rates between the sendinghost and the switch and between the switch and the receiving host are R$1$ and R$2,$ respectively. Assuming that the switch uses store$-$and$-$forward packet switching, what is the total end$-$to$-$end delay to send a packet of length L$?($Ignore queuing, propagation delay,and processing delay.$).$ What happens in the case of not having store and forward packet switching capacity as well as not havingqueuing capacity.