Question No. 1: (5 marks)

Assume, in a network, a switch runs for a very long time and it is used to share a link between the 4 concurrent connected connections i.e. W, X, Y and Z whose packets arrive in bursts. The link’s data rate is 1 packet per time slot. The average packet arrival rates of W, X, Y and Z in packets per time slot, are 0.4, 0.1, 0.3 and 0.2 respectively. The average delays observed at the switch are 5, 5, 10 and 10. Calculate the average queue lengths of the 4 queues (W through Z) at the switch.

Note: Calculation steps are necessary to be shown.

Question No 2: (5 marks)

For P = 1011 and M = 1101000, find the CRC (Cyclic Redundancy Check).

Note: Calculation steps are necessary to be shown.