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

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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