Cambridge International AS and A level IT
Review questions 1
Give an example of data. [1]
2
Describe the term knowledge. [1]
A news and sports website includes both static and dynamic data. 3a Compare static and dynamic data. [4] 3b Identify and describe two factors that affect the quality of information on the website. [4] 3c Give an example of coded data related to the news and sports website. [1] The website streams news and sports videos. 3d Explain why the video is compressed when it is encoded. [2] 3e Identify three factors that will affect the size of a video file. [1] 3f Identify and describe two factors that affect the file size of images on the website. [4] Users can pay for premium services on the website using their credit card. 4a Explain why the website uses https at the beginning of the website address instead of http. [4] 4b Describe symmetric encryption. [1] The journalists working for the website encrypt their emails. 22
4c Describe how asymmetric encryption is used with emails. [2] When the users subscribe to premium features, they have to choose a password. 4d Describe how verification can be used when entering the password. [1] There is a form on the website that can be used to submit news stories. When data is entered onto the form, it is validated. 5a Describe the purpose of validation. [1] 5b Using an example related to submitting a news story, identify and describe one method of validation. [3]