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What is pseudo header? Why it is used in UDP?
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The purpose of using a pseudo header is to verify that the UDP datagram has reached it’s correct destination.

  1. The key to understanding the pseudo header lies in realizing that the correct destination.

  2. Specific machine and specific protocol port within that machine.

  3. The UDP header itself specific only the protocol port number, to verify the destination.

  4. UDP on sending machine computers checksum that covers the destination IP address as well as the UDP datagram.

  5. The pseudo header is not transmitted with the UDP datagram nor is it included in the length.

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