Computer Science for IGCSE & O level - Data Transmission (Section 3 - No. 15)
What is a potential drawback of using echo checks?
They are very complex to implement.
They don't detect any errors.
They can increase transmission time.
They are only effective with symmetric encryption.
Shpjegimi
Because the data must be sent and then sent back, echo checks can increase the time required for data transmission.