Q$4.$Consider the two scenarios below:

$$A circuit$-$switching scenario in which No users, each requiring a bandwidth of $20$Mbps$,$ must share a link of capacity $100$ Mbps$.$

A packet$-$switching scenario with Nos users sharing a $100$ Mbps link, where each user again requires $20$ Mops when transmitting, but only needs to transmit $20$ percent of the time.