Q. When 2 or more bits in a data unit has been changed during the transmission, the error is called
✅ Correct Answer: (B)
burst error
Explanation: when a single bit error occurs in a data, it is called single bit error. when more than a single bit of data is corrupted or has error, it is called burst error. if a single bit error occurs, the bit can be simply repaired by inverting it, but in case of a burst error, the sender has to send the frame again.