0478_s23_qp_13
A paper of Computer Science, 0478
Questions:
11
Year:
2023
Paper:
1
Variant:
3
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1
Computers store data as binary. The binary number 10101110 is stored. Convert the binary number to denary. Working space Convert the binary number to hexadecimal. Working space A logical left shift of three places is performed on the binary number. Give the 8-bit binary number that would be stored after this logical left shift. Tick (3) one box to show which statement is true about the impact the logical left binary shift would have on the binary number. A The least significant bits are lost. B The most significant bits are lost. C The number has been divided by six. D The number stays the same. Add the two 8-bit binary numbers 11101110 and 00110001 using binary addition. Give your answer in binary. Show all your working. The denary number 301 needs to be stored. Calculate the least number of bits that can be used to store the denary number 301. Working space The hexadecimal number A4D needs to be stored. Calculate the least number of bits that can be used to store the hexadecimal number A4D. Working space
1. Data representation  →  1.1. Number systems
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2
A library has a self-checkout system that allows customers to register books that they want to borrow. The self-checkout system has a central processing unit (CPU). The CPU has two cores. State the purpose of a core in the CPU. The CPU is replaced with one that has four cores. Explain the effect this has on the performance of the self-checkout system. The CPU contains registers and buses. Describe the role of a register in the CPU. Identify one bus that can be found in the CPU and explain its purpose in the fetch–decode–execute cycle. Bus Purpose The self-checkout system allows the user to input their library membership number. Give two appropriate input devices that would allow the user to do this. The self-checkout system uses a monitor to display information about the book. Users who are blind also need to use the self-checkout system. Give an appropriate output device that would allow a blind user to be given this information. The self-checkout system uses two types of primary storage. Circle two types of primary storage that would be used in the system. compact disk (CD) digital versatile disk (DVD) hard disk drive (HDD) random access memory (RAM) read only memory (ROM) universal serial bus (USB) flash memory drive The self-checkout system is linked to a stock control system that is updated every time a book is borrowed from the library. A microprocessor is used in the stock control system to update the stock. Explain the role of the microprocessor in this system and how it is used to update the stock when a book is borrowed.
3. Hardware  →  3.1. Computer architecture
3. Hardware  →  3.3. Data storage
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4
A programmer writes a computer program in a high-level language. Tick (3) one box to show which statement is a benefit of writing a program in a high-level language, instead of a low-level language. A The program can directly manipulate the hardware. B The program is machine independent. C The program is more memory efficient. D The program is quicker to execute. Translators are used to translate the high-level language so that it can be processed by the computer. State what the high-level language is translated into. One translator converts and executes the code line by line. Identify which type of translator would do this. One translator creates an error report displaying all the errors in the code before it can be executed. Identify which type of translator would do this. One translator creates an executable file. Identify which type of translator would do this.
4. Software  →  4.2. Types of programming language, translators and integrated development environments (IDEs)
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6
A student is writing a help guide about how to recognise and avoid the cyber-security threat of pharming. Give three appropriate solutions he could include. The student also wants to include information in the help guide about the use of social engineering as a cyber-security threat. Describe what is meant by social engineering. Include one example of social engineering in your answer. The student includes information about the security solution of access levels. Describe what is meant by access levels.
5. The internet and its uses  →  5.3. Cyber security
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8
Complete the statements about a distributed denial of service (DDoS) attack. Use the terms from the list. Some of the terms in the list will not be used. You should only use a term once. anti-virus bot botnet hacker internet malware secondary storage spyware web browser web server website The attacker encourages people to download onto their computer. This will turn each computer into a , creating a network called a . When the attacker wants the DDoS to take place, repeated requests are simultaneously sent from the computers to a . This causes it to crash, meaning that users can no longer access the that is stored on this hardware.
5. The internet and its uses  →  5.3. Cyber security
3. Hardware  →  3.4. Network hardware
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9
A device can be given an internet protocol (IP) address. This can be an IPv4 or IPv6. Give one similarity between IPv4 and IPv6. Describe two differences between IPv4 and IPv6. A web page is requested using an IP address. Identify the system that stores a database of uniform resource locators (URLs) and their corresponding IP addresses. Identify the software that sends a request to the IP address to obtain the web page data.
3. Hardware  →  3.4. Network hardware
5. The internet and its uses  →  5.1. The internet and the world wide web
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