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