Is TCP checksum necessary or could TCP allow IP to checksum the data?

Related questions

1. Why do we put 1's complement of the calculated checksum in the checksum field?
2. What is md5 command?
3. Why does the IP checksum cover just the header?
4. Why is there no header checksum in IPv6?
5. What is the difference between a checksum and a hash?
6. What is my checksum?
7. How is checksum of IP header calculated?
8. How does CRC checksum work?
9. What is a md5 file?
10. How is a checksum used?

Tags

1. #removed
2. #checksum
3. #ethernet
4. #those
5. #decided
6. #segment
7. #favor
8. #checksums
9. #header
10. #entire
11. #designers
12. #mentioned
13. #frame
14. #other
15. #necessary
16. #cover
17. #covers
18. #layers