O-LevelComputer ScienceThe Internet and its uses2210/12 · May/June 2019 · Q619 Marks

Priya creates a website to sell her old comic books and superhero figures.

(a)She uses HTML to create her website. The HTML she produces has both structure and presentation. Explain what is meant by HTML structure and presentation. Include an example of each.[4]
(b)Priya uses cookies in her website. Five statements are given about cookies. Tick (✔) to show if the statement is True or False. Statement | True (✔) | False (✔) ---|---|--- Cookies can be used to store a customer's credit card details Cookies can be used to track the items a customer has viewed on a website Cookies will corrupt the data on a customer's computer Cookies are downloaded onto a customer's computer Cookies can be deleted from a customer's computer[5]
(c)Priya stores her website on a webserver. To transmit the website data to the webserver she uses parallel duplex data transmission. Describe how data is transmitted using parallel duplex data transmission.[4]
(d)Priya has a URL for her website. State what is meant by a URL.[1]
(e)(i)Priya is concerned about a denial of service attack (DoS) occurring on her webserver. Explain what is meant by a denial of service attack.[4]
(e)(ii)Give one security device that can be used to help prevent a denial of service attack.[1]

Mark scheme

Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.

[4] Structure This is the layout of the web page e.g. placing an image alongside some text // example of tag, such as <div> Presentation This is the formatting/style of the web page e.g. the colour that is applied to some text // example of tag, such as <font-color>
[5] 1 mark per each correct row. Statement | True (✔) | False (✔) Cookies can be used to store a customer's credit card details | | ✓ Cookies can be used to track the items a customer has viewed on a website | ✓ | Cookies will corrupt the data on a customer's computer | | ✓ Cookies are downloaded onto a customer's computer | ✓ | Cookies can be deleted from a customer's computer | ✓ |
[4] Four from: Several/multiple bits are transmitted at a time/simultaneously Several/multiple wires are used Data is transmitted in both directions at the same time/simultaneously
[1] One from: Uniform resource locator The website's address User friendly version of the IP address
[4] Four from: Designed to deny people access to a website A large number/numerous requests are sent (to a server) all at the same time The server is unable to respond/struggles to respond to all the requests The server fails/times out as a result
[1] One from: Proxy server Firewall

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