Error Detection

• The only way to do error detection and correction is to send extra data with each message.

• These error detection data are added to each message by the data link layer of the sender based on some mathematical calculations performed on the message

• The receiver performs the same mathematical calculations on the message it receives and matches its results against the error detection data that were transmitted with the message.

• If the two match, the message is assumed to be correct

• If they don’t match, an error has occurred

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