A company has a number of offices around the world.
(a) Data is transmitted between the offices over the Internet. In order to keep the data safe the
company is using Secure Socket Layer (SSL) protocol and a firewall at each office.
Explain how SSL protocol and a firewall will keep the company’s data safe.
SSL protocol


A company transmits data to external storage at the end of each day.
(a) Parity checks can be used to check for errors during data transmission.
The system uses odd parity.
(i) Tick (✓) to show for each of the received bytes whether they have been transmitted
correctly or transmitted incorrectly.

A clothing shop uses a barcode reader at the checkout. The checkout is linked to a stock control system. The system monitors stock levels and automatically keeps them above a minimum level. Explain how the stock control system automatically keeps the stock levels above a minimum level.


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