Question: Q.2 a) Why Fragmentation is necessary? How it is different than Segmentation in Transport layer. Suppose that a source S sends a message of length

Q.2 a) Why Fragmentation is necessary? How it is different than Segmentation in Transport layer. Suppose that a source S sends a message of length 5500 bytes via network A to a destination D. Network A has an MTU of 1500 bytes. Show how the datagram will be fragmented. The IP header is assumed to be 20 bytes. (Hint: Show values of the fields: ID, fragFlag and Offset). [2] b) Consider the network shown in the following diagram. Use Bellman Ford Distance Vector algorithm to compute the forwarding table for B after the 2nd step. Show all steps and calculations to get full credit. [6] 10
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