2. Data transmission
A section of Computer Science, 0478
Listing 10 of 82 questions
Umar is a manager in an office. The data that he uses on a daily basis is stored on a file server close to his computer. Data is sent from his computer to the file server using parallel simplex data transmission. Describe how the data is sent using parallel simplex data transmission. The file server is moved to another building that is 1 km away. Explain why the parallel simplex data transmission method that Umar uses is no longer suitable. Checksum and Automatic Repeat reQuest (ARQ) are both used when transmitting the data from a computer to the file server. Explain why checksum and ARQ are both used.
0478_s22_qp_13
THEORY
2022
Paper 1, Variant 3
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Data is encrypted to keep it safe during transmission. Complete the paragraph about asymmetric encryption. Use the terms from the list. Some of the terms in the list will not be used. You should only use a term once. asymmetric certificate cipher text decrypted encrypted parallel key plain text private key protected public key serial key symmetric is encrypted into using a . The encrypted data is then transmitted from the sender to the receiver. The encrypted data is then decrypted using a .
0478_s24_qp_11
THEORY
2024
Paper 1, Variant 1
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Data can be transmitted from one device to another. Tick (3) one box to show which of the terms is not a method for transmitting data. A serial B simplex C parallel D parity Data is broken down into smaller units to be transmitted from one device to another. Give the name of the unit that data is broken down into. Data is often encrypted when it is transmitted from one device to another. Explain how data is encrypted using symmetric encryption. Give the purpose of encryption. ,  ,
0478_s24_qp_12
THEORY
2024
Paper 1, Variant 2
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Sonia shares files with her friends. The method of data transmission she uses is half-duplex serial transmission. Describe how data is transmitted using half-duplex serial data transmission. The system uses parity bits to check for errors during data transmission. The outcome of four bytes after transmission is: Byte 1 Byte 2 Byte 3 Byte 4 One of the bytes has been transmitted incorrectly. Identify the byte that was transmitted incorrectly. Byte Explain how you identified the byte that was transmitted incorrectly.
0478_w19_qp_11
THEORY
2019
Paper 1, Variant 1
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Maisey purchases a new router and attaches it to her computer. The connection she sets up uses duplex data transmission. Five statements are given about duplex data transmission. Tick (✓) to show if the statement is True or False. Statement True (✓) False (✓) Duplex data transmission can be either serial or parallel Duplex data transmission is when data is transmitted both ways, but only one way at a time Duplex data transmission is always used to connect a device to a computer Duplex data transmission is when data is transmitted both ways at the same time Duplex data transmission automatically detects any errors in data Maisey’s computer uses an integrated circuit (IC) for data transmission that sends multiple bits at the same time. State whether the IC uses serial or parallel data transmission. Maisey purchases a new printer and connects it to her computer using the USB port. Explain two benefits of using a USB connection. Benefit 1 Benefit 2
0478_w19_qp_12
THEORY
2019
Paper 1, Variant 2
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Blair writes a paragraph about data transmission in her Computer Science examination. Use the list given to complete Blair’s paragraph by inserting the correct five missing terms. Not all terms will be used. Terms can be used more than once. • duplex • half-duplex • parallel • serial • simplex data transmission is when data is transmitted a single bit at a time. data transmission is when multiple bits of data are sent all at once. If a user wants to transmit data over a long distance, with the highest chance of accuracy, data transmission should be used. If data needs to be transmitted in one direction only, for example from a computer to a printer, data transmission should be used. If a user has a large amount of data to transmit and this needs to be done as quickly as possible data transmission should be used.
0478_w19_qp_13
THEORY
2019
Paper 1, Variant 3
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Questions Discovered
82