ARQ | Computer for GCSE/IGCSE - Class 10 PDF Download

Automatic Repeat Request (ARQ)

  • When data is sent from sender to receiver, errors may occur during transmission. The receiver must examine the data for errors, although it may not always identify the exact error location.
  • Automatic Repeat Request (ARQ) is a communication protocol that informs the sender about errors in received data.
    This protocol operates as follows:
    • If an error is detected, the receiver sends a negative acknowledgment to signal data corruption.
    • If no error is found, the receiver sends a positive acknowledgment, indicating data accuracy.
    • In case the receiver doesn't acknowledge, the sender waits for a specific duration, termed a timeout, before retransmitting the data.
    • This process iterates until all data is successfully received and acknowledged.

Question for ARQ
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What is the purpose of the Automatic Repeat Request (ARQ) communication protocol?
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