There is a chance of data corruption and error during the transmission of packets. The checksum is used to check such errors in most of the TCP IP protocols. The checksum is calculated at the sender and the value obtained is sent with the packet. The receiver repeats the same calculation on the packet including the checksum. If the result is satisfactory, the packet is accepted; otherwise, it is rejected. This video explains how the checksum is calculated at the sender side and verified at the receiver side with example.
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