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Checksum Verification

Jul 29,2008 by admin

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Checksum Verification

Each exchange of data between two connected peers involves a 16-bit checksum number. The recipient uses the checksum to verify that the data received is identical to the data sent by the originating node. If the checksum verification fails, the segment is discarded and not acknowledged, thereby causing the originating node to retransmit the segment. A checksum is not fail-safe, however, but does serve to provide a substantial level of probability that the data being received is in fact identical to the data transmitted by the sender.

The TCP checksum is not the only means of validating data correctness. The IPv4 header provides a header checksum, and Ethernet provides a CRC. As mentioned previously, these do not provide a fail-safe guarantee that the data received is correct but do minimize the probability that data received is incorrect substantially.

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