Question: 6. (11 points) UDP and TCP use 1s complement for their checksums. Suppose you have the following three 8-bit bytes: 01011111, 01110000, 11001001. a) What

6. (11 points) UDP and TCP use 1s complement for their checksums. Suppose you have the following three 8-bit bytes: 01011111, 01110000, 11001001.

a) What is the 1s complement of the sum of these 8-bit bytes? (Note that although UDP and TCP use 16-bit words in computing the checksum, for this problem you are being asked to consider 8-bit sums.) Show all work. (4)

b) Why is it that UDP takes the 1s complement of the sum; why not just use the sum? (3)

c) With the 1s complement schema, how does the receiver detect errors? Is it possible that a 1-bit error will go undetected? How about a 2-bit error? (4)

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