UDP and TCP use Is complement for their check sums.

UDP and TCP use Is complement for their check sums. Suppose you have the following three 8-bit bytes: 01010011, 01100110, 01110100. What is the Is complement of the sum of these 8-bit bytes? (That although UDP and TCP use 16-bit words in computing the checksum, for this problem you are being asked to consider s-bit sums.) Show all work. Why is it that UDP takes the Is complement of the sum; that is, why not just use the sum? With the I s complement scheme, how does the receiver detect errors? Is it possible that a 1-bit error will go undetected? How abolit a 2-hit error? 

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