Suppose users share a 1Mbps link. Also suppose each user requires 100Kbps when transmitting, but each user transmits only 20% of the time.
a) When circuit switching is used, how many users can be supported?
b) For the remainder of the problem, suppose packet switching is used. Find the probability that a given user is transmitting.
c) Suppose there are 20 users. Find the probability that at any given time, exactly n users are transmitting simultaneously.
d) Find the probability that there are 11 or more users transmitting simultaneously.