Question: The IP checksum needs to be recalculated at routers because of changes to the IP header, such as the lifetime field. It is possible to

The IP checksum needs to be recalculated at routers because of changes to the IP header, such as the lifetime field. It is possible to recalculate the checksum from scratch. Suggest a procedure that involves less calculation. Hint: Suppose that the value in 16-bit word k is changed by Z = new_value - old_value; consider the effect of this change on the checksum.

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