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3. a) Figure Q3a shows a network system of four queues being serviced according to a WFQ (Weighted Fair Queuing) scheduling policy in differentiation of quality of services (QoS). The weights given to the four queues (A, B, C, D) are 3, 2, 4, and 1 respectively. They are being serviced by a processor at the rate of 10 Mbps. B D Figure Q3a. Table Q3a gives a list of different input traffic rates (in Mbps) at the four input queues. Complete the resultant output rates for each of the four queues. Input Rates Output Rates A B D NO A 2 5 3 1 10 B 2 3 8 10 3 UNNNAN 1 4 6 6 Table Q3a. [10 marks) b) Figure Q3b shows two network switches S1 and 2 on the path between hosts A and B. It also shows the link capacities. The propagation time on each link is p sec. "S1 and 52 are store-and- forward packet switches". Explain what this statement means and derive a formula for the delay when sending a packet of s bits from A to B. (Ignore all other possible sources of delay). a bps sbbps S cbps B Figure Q3b. [10 marks) 3. a) Figure Q3a shows a network system of four queues being serviced according to a WFQ (Weighted Fair Queuing) scheduling policy in differentiation of quality of services (QoS). The weights given to the four queues (A, B, C, D) are 3, 2, 4, and 1 respectively. They are being serviced by a processor at the rate of 10 Mbps. B D Figure Q3a. Table Q3a gives a list of different input traffic rates (in Mbps) at the four input queues. Complete the resultant output rates for each of the four queues. Input Rates Output Rates A B D NO A 2 5 3 1 10 B 2 3 8 10 3 UNNNAN 1 4 6 6 Table Q3a. [10 marks) b) Figure Q3b shows two network switches S1 and 2 on the path between hosts A and B. It also shows the link capacities. The propagation time on each link is p sec. "S1 and 52 are store-and- forward packet switches". Explain what this statement means and derive a formula for the delay when sending a packet of s bits from A to B. (Ignore all other possible sources of delay). a bps sbbps S cbps B Figure Q3b. [10 marks)