Question $4(35$ points$)$:

Consider the two scenarios below:

a$.$ A circuit$-$switching scenario in which N c s users, each requiring a bandwidth of $20$

Mbps$,$ must share a link of capacity $100$ Mbps$.$

b$.$ A packet$-$switching scenario with N p s users sharing a $100$ Mbps link, where each

user again requires $20$ Mbps when transmitting, but only needs to transmit $20$

percent of the time.