O-LevelComputer ScienceThe Internet and its uses2210/11 · May/June 2017 · Q138 Marks
Gurdeep wants to send a large file to Jennifer over the Internet.
- (a)State two benefits of compressing the file to send it. Benefit 1 Benefit 2[2]
- (b)(i)Two types of compression are lossy and lossless. Choose the most suitable type of compression for the following and explain your choice. Downloading the code for a computer program: Type of compression Explanation[3]
- (b)(ii)Streaming a video file: Type of compression Explanation[3]
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [2] Two from: ∞ Smaller file to transmit ∞ The file is transmitted quicker ∞ Uses / requires less bandwidth
- [3] ∞ Lossless (compression) ... ∞ ... It is important the code must be (exactly) the same as the original file ... ∞ ... If it does not match the original file it will not work
- [3] ∞ Lossy (compression) ... ∞ ... It would make the file smaller than lossless compression / the file would stream faster than lossless compression ∞ ... The quality of the video can be reduced but it can still be viewed
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