Question: Why is IP fragmentation bad?

If stream A has a much higher data rate than stream B, 64 fragments from stream A may arrive in between the fragments from stream B, causing the B fragment to be dropped. Thus, while IP fragmentation can reduce overhead by minimizing user headers, it may cause more trouble than it is worth.

Why is fragmentation done?

Fragmentation is done by the network layer when the maximum size of datagram is greater than maximum size of data that can be held a frame i.e., its Maximum Transmission Unit (MTU). The network layer divides the datagram received from transport layer into fragments so that data flow is not disrupted.

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