TCP uses a checksum to ensure the integrity of its transmitted data. When a packet arrives at its destination, the TCP checksum is recalculated to verify that the data was not corrupted during transit.
If the checksum calculation results in an error, TCP will assume that the data was corrupted during transmission and request that the sender retransmit the data. The checksum error is an indication of data corruption, which can occur due to bit errors or other transmission problems, such as interference.
TCP checksum errors are usually handled by retrying the transmission of the packet until it is received without errors. This helps to ensure that the data reaches its destination without any errors. If the packet cannot be successfully transmitted after several attempts, the connection may be terminated.
