Both TCP and UDP use 1’s complement for their checksum values: a. Suppose that you have the following 8-bit bytes: 01010101, 01110000, and 01001100. Calculate the 1’s complement of the sum of all of these 8-bit bytes (that is, add them all together and then determine the 1’s complement from that sum), being sure to handle the overflow as described in the text in a circular fashion. Note that TCP and UDP use 16-bit words in computing the checksum, but only 8-bits are used here for simplicity. b. Is it possible that a 1-bit error will go undetected by the checksum? If yes, explicitly state how this can happen. c. Is it possible that a 2-bit error will go undetected by the checksum? If yes, explicitly state how this can happen.

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i think the answer is a or d

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