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Methods Of Error Detection (GCSE Computing)

The following is a GCSE Computing test covering 'Methods Of Error Detection' from the broader topic 2. Data Transmission. The test is geared towards the CAMBRIGE-IGCSE exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

In the parity-byte example (parity for each column), the parity byte bit for a column is 1 if:
Why might a system use checksum instead of CRC?
Which of these is a limitation of a single parity bit per byte?
Which statement best describes the primary purpose of error detection methods?
What does ARQ (Automatic Repeat reQuest) do when an error is detected?
A parity byte (longitudinal parity) is used mainly to:
Which method is most suitable when error correction at the receiver is required without retransmissions (e.g., in real-time audio)?
Which error-detection method is most commonly used with file downloads and storage to verify integrity after transfer?
Which method adds one extra bit to each byte so the number of 1 bits is odd or even to detect single-bit errors?
Which method would commonly be used in network frames (Ethernet) to detect errors?
What does the receiver typically do if CRC indicates an error in a packet?