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Error detection: IGCSE Computer Science questions with answers Free Error detection questions for IGCSE Computer Science (0478), part of Data transmission. Each question has the answer and the marking points an examiner would look for.
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Error detection practice questions Question 1 Structured · 4 marks
(a) The 7-bit data 1010001 is sent using odd parity. The parity bit is the most significant bit. Write the byte that is sent.
[1] (b) The byte 01011001 is received using odd parity. Explain how the receiver knows an error has occurred.
[2] (c) Identify one other method of error detection.
[1] Show answers and mark scheme Part Answer and marking points Marks (a) 0101000101010001 B1
1 (b) It has 4 ones, an even number, which does not match odd parityCounts the number of 1s B1 B1
2 (c) checksum / echo check / check digit / ARQchecksum, echo check, check digit or ARQ B1
1
Question 2 Structured · 4 marks
(a) State what is meant by the term checksum.
[2] (b) State what is meant by the term automatic repeat request.
[2] Show answers and mark scheme Part Answer and marking points Marks (a) A value calculated from a block of data and sent with it so errors can be detectedA value calculated from a block of data and sent with it so errors can be detected B2
2 (b) Error detection using acknowledgements and timeouts to request retransmissionError detection using acknowledgements and timeouts to request retransmission B2
2
Question 3 Structured · 4 marks
(a) The 7-bit data 0010100 is sent using even parity. The parity bit is the most significant bit. Write the byte that is sent.
[1] (b) The byte 01010100 is received using even parity. Explain how the receiver knows an error has occurred.
[2] (c) Identify one other method of error detection.
[1] Show answers and mark scheme Part Answer and marking points Marks (a) 0001010000010100 B1
1 (b) It has 3 ones, an odd number, which does not match even parityCounts the number of 1s B1 B1
2 (c) checksum / echo check / check digit / ARQchecksum, echo check, check digit or ARQ B1
1
Question 4 Structured · 4 marks
(a) State what is meant by the term automatic repeat request.
[2] (b) State what is meant by the term checksum.
[2] Show answers and mark scheme Part Answer and marking points Marks (a) Error detection using acknowledgements and timeouts to request retransmissionError detection using acknowledgements and timeouts to request retransmission B2
2 (b) A value calculated from a block of data and sent with it so errors can be detectedA value calculated from a block of data and sent with it so errors can be detected B2
2
Question 5 Structured · 4 marks
(a) The 7-bit data 1110110 is sent using odd parity. The parity bit is the most significant bit. Write the byte that is sent.
[1] (b) The byte 01111110 is received using odd parity. Explain how the receiver knows an error has occurred.
[2] (c) Identify one other method of error detection.
[1] Show answers and mark scheme Part Answer and marking points Marks (a) 0111011001110110 B1
1 (b) It has 6 ones, an even number, which does not match odd parityCounts the number of 1s B1 B1
2 (c) checksum / echo check / check digit / ARQchecksum, echo check, check digit or ARQ B1
1
Question 6 Structured · 4 marks
(a) The 7-bit data 1111111 is sent using even parity. The parity bit is the most significant bit. Write the byte that is sent.
[1] (b) The byte 11101111 is received using even parity. Explain how the receiver knows an error has occurred.
[2] (c) Identify one other method of error detection.
[1] Show answers and mark scheme Part Answer and marking points Marks (a) 1111111111111111 B1
1 (b) It has 7 ones, an odd number, which does not match even parityCounts the number of 1s B1 B1
2 (c) checksum / echo check / check digit / ARQchecksum, echo check, check digit or ARQ B1
1
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