A circuit-switching scenario in which Ncs users, each requiring a bandwidth of 25 Mbps, must share a link of capacity 100 Mbps.

A packet-switching scenario with Nps users sharing a 100 Mbps link, where each user again requires 25 Mbps when transmitting, but only needs to transmit 10 percent of the time.

What is the probability that any 4 users (of the total 7 users) are transmitting and the remaining users are not transmitting? (Hint: you will need to use the binomial distribution [1, 2]).

What is the probability that more than 4 users are transmitting? Comment on what this implies about the number of users supportable under circuit switching and packet switching.