Question List:

a$.$ When circuit switching is used, what is the maximum number of users that can

be supported? $(5$ points$)$

b$.$ Suppose packet switching is used. What is the probability that a given $($specific$)$

user is transmitting, and the remaining users are not transmitting? $(10$ points$)$

c$.$ Suppose packet switching is used and there are $9$ users in total. What is the

probability that one user $($any one among the $9$ users$)$ is transmitting, and the

remaining users are not transmitting? $(10$ points$)$

d$.$ Suppose packet switching is used and there are $9$ users in total. What is the

probability that more than $5$ users are transmitting? $(10$ points