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Show the entries for the header of a UDP user datagram that carries a message from a TFTP client to a TFTP server. Fill the checksum field with 0s. Choose an appropriate ephemeral port number and the correct well-known port number. The length of data is 40 bytes

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Final answer:

The header of a UDP user datagram that carries a message from a TFTP client to a TFTP server includes the port numbers, length, and checksum fields.

Step-by-step explanation:

The header of a UDP user datagram that carries a message from a TFTP client to a TFTP server consists of various fields, including the source port number, destination port number, length, and checksum. In this case, the well-known port number for TFTP is 69.

For the source port number, an appropriate ephemeral port number needs to be chosen. An ephemeral port range is typically between 49152 and 65535, so any number within that range can be used.

The length of the data in this case is 40 bytes. Lastly, the checksum field should be filled with zeros.