Computer Science for IGCSE & O level - Data Transmission (Section 15 - No. 14)
Which of the following is a characteristic of an echo check?
Data is transmitted only once.
The sending device receives a copy of the transmitted data to confirm the reception.
A checksum is always included.
It is used to compress the data.
解释
In an echo check, the receiver sends the data back to the sender to verify the accuracy.