When the UDP checksum is calculated for IPv6, what is the result if the checksum value is 0? A. The 0 indicates that an error occurred in the checksum calculation, and the packet is discarded at the source node.
B. The 0 is always the correct result of the checksum calculation, and the packet is then successfully sent to its destination.
C. The 0 is placed in the Zeros field in the IPv6 header.
D. The 0 is changed to the FFFF hex value and placed in the UDP header.
The correct answer is D. The 0 is changed to the FFFF hex value and placed in the UDP header.
### Explanation:
In UDP (User Datagram Protocol) used over IPv6, a checksum of 0 is considered an indication of no checksum. According to the UDP specifications, if the checksum calculation results in 0, it is conventionally transmitted as all 1’s (FFFF in hexadecimal). This means that when a checksum of 0 is calculated, it is modified to indicate that the checksum is not being used.
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