Computer Science for IGCSE & O level - Data Transmission (Section 5 - No. 23)
Which of the following best describes the operation of an echo check?
The sender sends a copy of the data and the receiver compares to the original to detect the error.
The receiver sends a copy of the data back to the sender to verify it.
The sender encrypts the data, and the receiver decrypts it to verify data.
It is a part of checksum and parity check methods.
Uitleg
In an echo check, the receiver returns the received data to the sender to verify its integrity.