1 A company owns a number of vending machines. Data is sent from each of these machines at the end of the day. The data contains amount of money taken, products sold and any error conditions/reports.
a ) The company uses both echo checking and automatic repeat requests (ARQS). i. Describe how echo checks work. Explain whether this is a suitable error checking method in this application. ii Describe how automatic repeat request (ARQ) works
b )Checksum and check digit are two terms often confused by students. Describe three differences of the two techniques.
2 Explain each of the following computer terms: i packet switching ii cyclic redundancy check iii data skewing iv universal serial bus v parity bit.