Computer Science for IGCSE & O level - Data Transmission (Section 13 - No. 24)
What is the role of the sender in automatic repeat request (ARQ)?
To calculate the checksum.
To retransmit data if an error is detected.
To decrypt the data.
To send an acknowledgment.
Explication
The sender retransmits the data if the receiver does not acknowledge its correct reception, or if a negative acknowledgement is received.