The goal of this exercise is to understand the difference between circuit switching and packet
switching, and to illustrate through a small example that packet switching allows to “pack” more
users on a link than with circuit switching. This is because with circuit switching, we need to
give each user the maximum bandwidth he needs. Therefore, a user holds this link bandwidth
even when it is inactive. With packet switching, an inactive user consumes no bandwidth, which
is then available to other active users.