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Suppose users share a 2 Mbps link. Also, suppose each user transmits continuously at 1 Mbps when transmitting, but each user transmits only 20 percent of the time.

1. When circuit switching is used, how many users can be supported?
2.  For the remainder of this problem, suppose packet switching is used. Why
will there be essentially no queuing delay before the link if two or fewer
users transmit at the same time? Why will there be a queuing delay if
three users transmit at the same time?
3.  Find the probability that a given user is transmitting.
4. Suppose now there are three users. Find the probability that at any given
time, all three users are transmitting simultaneously. Find the fraction of
time during which the queue grows.
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