| Date | May 2022 | Marks available | 2 | Reference code | 22M.1.SL.TZ0.4 |
| Level | SL | Paper | 1 | Time zone | no time zone |
| Command term | Outline | Question number | 4 | Adapted from | N/A |
Question
Outline the reason for compression when transmitting data.
Markscheme
Award [2 max].
The reason for compression when transmitting data is to save on transfer times;
As it reduces the number of bits needed to represent data (when compared with the original data);
Compressing data involves modifying/restructuring files, so that they take up less space;
And this results in cost savings in cloud storage;
To take up less bandwidth;
Because data compression reduces the size of files to be transmitted over a network;
Note to examiners: Award [1] for a reason (for example, to save data usage for sending files over the internet, to save storage capacity, to speed up file transfer, to decrease costs for network bandwidth, etc.), and award [1] for an expansion.
Examiners report
Candidates were aware of a reason for the use of compression when transmitting data. Some candidates, however, directed their responses to generic reasons for compression, rather than the scenario of data transmission, as stated in the question.
