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Protocols that uses checksum

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Good evening everyone, I have a question in my project and I need your help if possible. The question is:
  • Checksum is used by various protocols on the Internet, but not at the one of TCP / IP layers. Explain.
I got confused while I'm searching about it, I search in some sites, and I found that all layers have their own checksum.
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The IP and TCP layers both have checksums in IPv4, but only the TCP layer in IPv6. See the following Stack Exchange questions for more detail.

https://stackoverflow.com/questions/7476543/checksum-done-on-internet-layer-or-transport-layer 
https://networkengineering.stackexchange.com/questions/52936/difference-between-ip-checksum-and-tcp-checksum