Daily Practice · GCSE Computer Science

Daily Practice - GCSE Computer Science

16th December 1997

5 questions · GCSE · 123 questions in this band

1
Secondary Storage
A company backs up its files onto magnetic tape cartridges, each with a capacity of 3 TB. The company needs to back up 20 TB of data. Calculate the minimum number of cartridges needed.
2
System Software
A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
3
Networks and Topologies
Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
4
Network Security
A simple cipher shifts every letter 2 places forward in the alphabet, wrapping around so Y becomes A and Z becomes B. Encrypt the plaintext CAT using this cipher.
5
Ethical, Legal, Cultural and Environmental Impact
State whether the source code of proprietary (closed source) software is normally available for the public to view.

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