Suppose that the UDP receiver computes the Internet checksum for the received UDP segment and finds that it matches the value carried in the checksum field. Can the receiver be absolutely certain that no bit errors have occurred? Explain.
Certainty of no bit errors at receiver end using checksum using UDP:
The receiver in the UDP (User Datagram Protocol) verifies the received segment by calculating internet checksum and comparing it with the value in the checksum field.
Therefore, it is not possible to the receiver in UDP to be sure that there are no bit errors have occurred.