2210_s21_qp_11
A paper of Computer Science, 2210
Questions:
8
Year:
2021
Paper:
1
Variant:
1
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1
Benedict has a computer that is assigned an Internet Protocol (IP) address. The IP address is: 198.167.214.0 The IP address is represented as denary values. Convert the denary values 167 and 214 from the IP address to 8-bit binary. Working space Benedict’s computer is also assigned a Media Access Control (MAC) address. Identify one similarity between an IP address and a MAC address. Identify two differences between an IP address and a MAC address. Difference 1 Difference 2
3. Hardware  →  3.4. Network hardware
Open
2
Julia inputs personal data into her computer. She stores three copies of the data using a hard disk drive (HDD), a solid state drive (SSD) and a USB flash memory drive. Identify three devices Julia can use to input personal data into her computer. Device 1 Device 2 Device 3 Six statements are shown about HDDs, SSDs and USB flash memory drives. Tick (✓) to show which statements apply to each type of storage. Some statements can apply to more than one type of storage. Statement HDD (✓) SSD (✓) USB flash memory drive (✓) it has no moving parts it is non-volatile it can use NAND gates to store data it uses magnetic properties to store data it has the smallest physical size it has the slowest read/write speeds Julia uses a USB connection to transfer data onto her USB flash memory drive. One benefit of using a USB connection is that it is a universal connection. State two other benefits of using a USB connection. Benefit 1 Benefit 2 Identify the type of data transmission used in a USB connection.
3. Hardware  →  3.3. Data storage
2. Data transmission  →  2.1. Types and methods of data transmission
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3
A firewall can be used to help keep the data secure that is stored on a computer. The given paragraph describes how the firewall operates to help keep the data secure. Complete the paragraph using the most appropriate terms from the given list. Not all of the terms on the list need to be used. • Accept • Criteria • Hacking • Input • Network • Outgoing • Output • Processor • Reject • Software • Store • Storage A firewall can be or hardware based. It monitors traffic between the computer and the The user sets for the traffic. The firewall will or the traffic based on this. It can help prevent and malicious software that could be a threat to the security of the data. Identify three other methods that could be used to keep the data secure. Method 1 Method 2 Method 3
5. The internet and its uses  →  5.3. Cyber security
8. Programming  →  8.3. File handling
2. Data transmission  →  2.1. Types and methods of data transmission
Open
5
Jamelia has a greenhouse that she uses to grow fruit and vegetables. She needs to make sure the temperature in the greenhouse stays between 25 °C and 30 °C . A system that has a temperature sensor and a microprocessor is used to maintain the temperature in the greenhouse. The system will: • open a window and turn a heater off if it gets too hot • close a window and turn a heater on if it gets too cold. Describe how the system uses the temperature sensor and the microprocessor to maintain the temperature in the greenhouse.
3. Hardware  →  3.1. Computer architecture
6. Automated and emerging technologies  →  6.1. Automated systems
3. Hardware  →  3.2. Input and output devices
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6
Consider the logic statement: X = (((A AND B) OR (C AND NOT B)) XOR NOT C) Draw a logic circuit to represent the given logic statement. Do not attempt to simplify the statement. All logic gates must have a maximum of two inputs. X B A C Consider the completed truth table for the given logic statement. Row number A B C Working space X There are four errors in the truth table in the output (column. Identify the four incorrect outputs. Write the row number to identify each incorrect output. Row Row Row Row
10. Boolean logic  →  10. Boolean logic
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7
A music company has a website that allows users to stream music. The music is stored in sound files. The sound files are compressed using lossless compression. Describe how the sound files are compressed using lossless compression. State one reason why the music company would compress the sound files using lossless, rather than lossy, compression. Give one benefit, to the user, of the music company compressing the sound files. Give one drawback of the music company using lossless, rather than lossy, compression for the sound files. Describe how the web pages for the website are requested and displayed on a user’s computer. The web server that hosts the website suffers a denial of service (DoS) attack. Explain why this will prevent users from accessing the website.
1. Data representation  →  1.3. Data storage and compression
Open
8
Four 7-bit binary values are transmitted from one computer to another. A parity bit is added to each binary value creating 8-bit binary values. All the binary values are transmitted and received correctly. Identify whether each 8-bit binary value has been sent using odd or even parity by writing odd or even in the type of parity column. 8-bit binary value Type of parity An error may not be detected when using a parity check. Identify why an error may not be detected. The data is sent using parallel half-duplex data transmission. Describe how data is sent using parallel half-duplex data transmission. State two drawbacks of using parallel data transmission. Drawback 1 Drawback 2
2. Data transmission  →  2.2. Methods of error detection
1. Data representation  →  1.1. Number systems
Open