Which term is described by the phrase 'ask again if error'?

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Multiple Choice

Which term is described by the phrase 'ask again if error'?

Explanation:
The idea being tested is how errors in transmitted data trigger a retransmission. “Ask again if error” describes a system where, once an error is detected, the receiver asks the sender to resend the data, and this happens until the data arrives correctly. This approach is Automatic Repeat reQuest (ARQ). It’s all about retrying after a failure to ensure the message gets through accurately, rather than just detecting errors after the fact. A check digit or a checksum is used purely to detect errors in the data, not to request a resend. An echo check involves echoing data back to verify it wasn’t corrupted, but it doesn’t inherently specify a rule to re-send on error. So the mechanism that fits the phrase best is Automatic Repeat reQuest.

The idea being tested is how errors in transmitted data trigger a retransmission. “Ask again if error” describes a system where, once an error is detected, the receiver asks the sender to resend the data, and this happens until the data arrives correctly. This approach is Automatic Repeat reQuest (ARQ). It’s all about retrying after a failure to ensure the message gets through accurately, rather than just detecting errors after the fact.

A check digit or a checksum is used purely to detect errors in the data, not to request a resend. An echo check involves echoing data back to verify it wasn’t corrupted, but it doesn’t inherently specify a rule to re-send on error. So the mechanism that fits the phrase best is Automatic Repeat reQuest.

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