Question 1: UDP and TCP use 1s complement for their checksum. Suppose you have the following three words: 0x5353, 0x6666,0x4747 a) What is the (binary) 1s complement of the sum of these 16-bit words? Show all working. [5] b) Why is it that UDP takes the 1s complement of the sum: that is, why not just use the sum? 12 c)With the 1s complement scheme, how does the receiver detect errors? Is it possible that a 1-bit error will go undetected? How about a 2-bit error? 13