3. (a) What is Checksum? Can a checksum be used to detect errors correctly 100% of the time? If we want to be able to detect three-bit errors, what should be the minimum Hamming distance? 3. (b) A...

Extracted text: 3. (a) What is Checksum? Can a checksum be used to detect errors correctly 100% of the time? If we want to be able to detect three-bit errors, what should be the minimum Hamming distance? 3. (b) A sender needs to send the four data items 0x0236, 0×0BCC, 0×03BC, and 0XEEEE. To avoid confusion, Ox is written in the prefix to denote that the data is in Hexadecimal. For example, Ox3456 is 3456 in hexadecimal. Now answer the following: i. Find the checksum at the sender site. li. If the second data item is changed to 0XABCD and the third data item is changed to 0X04BD during transmission, check if there is any error at the receiver site.