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Error-Control

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As Ipv4 datagram format contains 16 bit header checksum.

Then why can't we say that network layer perform error control?
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IPV4 header calculation:

  1. ONLY Header is divided into 16-bit parts and added together.
  2. The final sum is complemented.  

 It helps to check any error happenedon header part only, not data

Thus network layer do not perform error control 

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