Why do we put 1's complement of the calculated checksum in the checksum field?

Related questions

1. What is the function of the checksum field in a TCP header?
2. What is difference between CRC and checksum?
3. What is my checksum?
4. How do I verify checksum of a downloaded file?
5. How is a checksum used?
6. Does UDP use checksum?
7. How is checksum calculated in UDP?
8. What is checksum method?
9. How does CRC checksum work?
10. How do I verify checksum on Mac?

Tags

1. #normally
2. #trimmed
3. #chunks
4. #length
5. #values
6. #example
7. #result
8. #complement
9. #added
10. #except
11. #above
12. #reason
13. #machine
14. #however