QUESTION 5 ITOTAL MARKS: 25] [10 Marks] Q 5(a) Consider Quality of Service provision within the core network i) What 3 basic principles underlie the DiffServ architecture? (6 marks,) i) What 4th principle is required in the IntServ architecture? (2 marks) ii) What principle of current internet design does IntServ violate? (2 marks) [15 Marks] Q 5(b) Suppose we wish to implement a DiffServ Architecture as follows There are three classes of traffic o The first class should be allocated at least 60% of available bandwidth o The second class should be allocated at least 30% of the available bandwidth o The third class should receive the rest. Additionally, streams for the classes transmit at different rates o o o The first class transmits at 1 Mbps The second class transmits at 50 kbps The third class transmits at 10 kbps i) Suggest a Weighted Fair Queuing policy to enforce the bandwidth i) What guarantees does a weighted fair queuing policy offer to individual ii) Suppose the overall system bandwidth is 4 Mbps allocation requirement for the system. (4 marks) traffic streams?(2 marks) a. What is the maximum number of streams of each traffic class that are guaranteed to be supported?(4 marks) b. Under what circumstances might additional streams of a traffic class be supported?(2 marks) Suppose that now the third class requires absolutely no bandwidth guarantees, while the first and second are as before. Suggest your own policy to share the bandwidth according to this scenario. Be sure to justify your choice. (3 marks) iv) [End of Question 5]