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5. a) Mention two core differences between circuit switched and packet switched [5] network. Imagine there are 3 switches/routers in between the source and destination. Find out a formula for calculating total delay in a datagram switched network with appropriate diagrams. Your diagram should point out propagation time, transmission time and waiting time if any. b) [10] A B Suppose a message travels from A to B. What should be the total delay if you follow the shortest possible path based upon the above diagram? Consider the networks as a datagram network. You cannot visit any component more than once [Component = any end device or internetworking device) Consider a 4.5 Gbyte message and bandwidth of the network is 500 Gbps. Assume that the distance between A and B is 2.25x100mm and light travels at 2.4x108 m/s. Consider the first waiting time as 3.03 seconds. The 2nd waiting time should be first waiting time * multiplied by 2 The 3rd waiting time should be first waiting time * multiplied by 3 The 4th waiting time should be first waiting time * multiplied by 4 The 5th waiting time should be first waiting time * multiplied by 5 The 6th waiting time should be first waiting time * multiplied by 6 The 7th waiting time should be first waiting time * multiplied by 7 You should only consider the waiting times that are needed based upon the above diagram