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Internet Protocol error checking

Last updated on December 27, 2018

        The <a href="https://tools.ietf.org/html/rfc791" rel="nofollow">RFC 791</a> says :
The internet protocol does not provide a reliable communication facility. There are no acknowledgments either end-to-end or hop-by-hop. There is no error control for data, only a header checksum. There are no retransmissions. There is no flow control. Errors detected may be reported via the Internet Control Message Protocol (ICMP) [3] which is implemented in the internet protocol module.
My questions :
  1. give an example when the header checksum is set to 1
  2. 'Errors may be reported' what does that mean ? How it decides which errors it should report and which not ?
Thank you in advance! Note that I am not a college student so if you throw some weird words please explain what they mean.

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