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An organisation that supplies audiobooks over the internet is moving into a new office building - Edexcel - GCSE Computer Science - Question 3 - 2018 - Paper 1

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An organisation that supplies audiobooks over the internet is moving into a new office building. (a) One reason for networking devices is to provide access to the i... show full transcript

Worked Solution & Example Answer:An organisation that supplies audiobooks over the internet is moving into a new office building - Edexcel - GCSE Computer Science - Question 3 - 2018 - Paper 1

Step 1

Give two other reasons for connecting devices to networks.

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Answer

  1. Share peripherals/devices (e.g., printers, scanners)
  2. Communicate (e.g., email, instant messaging, play games)

Step 2

Give three reasons why the organisation might prefer wireless connectivity.

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Answer

  1. May not have space for cables to be installed, which can limit flexibility.
  2. Employees and visitors can move around the building without being tethered to a desk.
  3. Adding new users may be easier without needing physical network connections.

Step 3

Explain why data loss is acceptable when using lossy compression.

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Answer

Lossy compression is often acceptable because the removed data may be imperceptible to the human ear, especially in audio files. This allows for smaller file sizes while maintaining an acceptable level of quality for the end user.

Step 4

Explain why RLE may NOT be a good choice for encoding a text file.

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Answer

RLE is not suitable for text files as it works best for data with many repeated characters. Text documents typically contain a wide variety of characters, which can lead to larger file sizes instead of compressing them.

Step 5

Construct an expression to show how many seconds it will take to transmit the audiobook file.

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Answer

Total number of bits to transfer = 81 MB * 1024^2 bytes/MB * 8 bits/byte Network speed = 54 Mbps = 54 * 1000^2 bits per second Time (in seconds) = Total number of bits / Network speed

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