0478_w20_qp_12
A paper of Computer Science, 0478
Questions:
5
Year:
2020
Paper:
1
Variant:
2
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1
Tina is creating a website for charity events. She uses HTML to create the website. State what is meant by HTML. She uses the hexadecimal colour code #43B7F0 as the background colour for her website. State whether background colour is an example of structure or presentation, in the website. The hexadecimal colour code #43B7F0 is stored in three 8-bit registers. Give the 8-bit binary values for each part of the hexadecimal code. B7 F0 Tina uses a microphone to record a welcome message for her website. State whether the microphone is an input or output device. She wants to compress the recording to make sure that the file is as small as possible for the website. Identify which type of compression she should use and describe how this would compress the file for the website. Type of compression Description Give two benefits of compressing the file for the website. Benefit 1 Benefit 2 Tina will use the TLS protocol in her website when selling tickets to people for different charity events. This makes sure that their personal data is transmitted securely. Identify the two layers that are present in the TLS protocol. Layer 1 Layer 2 Explain how data is sent securely using the TLS protocol. Tina is concerned about security threats to her web server. Identify three security threats to her web server that Tina might be concerned about. Tina installs a proxy server to help protect her website from security threats. Describe how the proxy server will help protect the website.
5. The internet and its uses  →  5.1. The internet and the world wide web
5. The internet and its uses  →  5.3. Cyber security
1. Data representation  →  1.3. Data storage and compression
Open
2
Four 7-bit binary values are transmitted from one computer to another. A parity bit was added to each binary value creating 8-bit binary values. All the binary values have been transmitted correctly. Tick (✓) to show whether an Even or an Odd parity check has been used for each binary value. 8-bit binary value Even (✓) Odd (✓) The data will also be checked using a checksum. Describe how a checksum can be used to check that the data has been transmitted correctly.
1. Data representation  →  1.1. Number systems
2. Data transmission  →  2.2. Methods of error detection
Open
3
Alessandro has some important data stored on his computer. He is concerned about accidental damage to his data. Identify three ways that the data could be accidentally damaged. State what Alessandro could do to make sure that he can retrieve his data if it is accidentally damaged. Alessandro uses an SSD to store his data. Describe what is meant by an SSD and how it operates to store data. Alessandro also uses off-line storage to store his data. Three examples of off-line storage are Blu-ray, CD and DVD. Six statements are given about off-line storage. Tick (✓) to show if each statement applies to Blu-ray, CD, or DVD. Some statements apply to more than one example of off-line storage. Statement Blu-ray (✓) CD (✓) DVD (✓) A type of optical storage Has the largest storage capacity Can be dual layer Read using a red laser Has the smallest storage capacity Stores data in a spiral track
3. Hardware  →  3.3. Data storage
1. Data representation  →  1.3. Data storage and compression
Open
5
Tammy is buying a new computer that has an LED display. Five statements about LED displays are given. Tick (✓) to show if each statement is True or False. Statement True (✓) False (✓) It is a flat panel display It creates images using red, green and blue diodes It is not very energy efficient and gives off heat It can be used in mobile devices such as smartphones and tablets It is a front-lit display Tammy connects the computer to her home network. The computer has a MAC address and an IP address. A paragraph is given about MAC addresses and IP addresses. Complete the paragraph using the list of terms given. Not all terms need to be used. • compiled • computer • control • dynamic • identify • packet • principal • protocol • similar • unique A MAC address is a media access …………………………………………………… address. A network device has a ……………………………………………………… MAC address that can help ………………………………………………. the device in the network. An IP address is an Internet ………………………………………… address. An IP address can be static or …………………………………………… . Tammy uses a browser when accessing the Internet. Describe the role of the browser.
3. Hardware  →  3.4. Network hardware
Open