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Describe method of checksum briefly?

Describe method of checksum briefly?



  • The sender subdivides data units into equal segments of ‘n’ bits(16 bits) 
  • These segments are added together using one’s complement 
  • The total (sum) is then complemented and appended to the end of the original data unit as redundancy bits called CHECKSUM 
  • The extended data unit is transmitted across the network
  • The receiver subdivides data unit as above and adds all segments together and complement the result 
  • If the intended data unit is intact, total value found by adding the data segments and the checksum field should be zero 
  • If the result is not zero, the packet contains an error & the receiver rejects it
Describe method of checksum briefly? Describe method of checksum briefly? Reviewed by MCH on July 20, 2012 Rating: 5

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