Computer Science for IGCSE & O level - Data Transmission (Section 13 - No. 1)
Which of the following is a critical step in the automatic repeat request (ARQ) process?
The sender encrypts the data.
The receiver sends an acknowledgement to the sender if the data is successfully received.
The data is transmitted only using serial data transmission.
A checksum is calculated and compared with the initial data.
Explicação
The acknowledgment signals successful data reception. Without it, the sender will continue re-transmitting.