Surely, it would be more efficient to put it at the beginning of the frame to check whether it is the original frame that was intended to be sent.
Can someone explain why this happens to be at the end. I know it's a silly question but I'm interested to know why? Surely if you check it first you can reliably know the frame is authentic.
Please let me know if this is not appropriate as I think it follows the rules but as I am posting for the first time I am unsure.
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