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Valid IPv6 Addresses - dallasskins - 01-12-2010

Is there any quick and sure fire way to tell if an IPv6 address is valid or not. I know it ask this question at least once during the exam and I recognize the IPv6 loop back but a normal host address is a little more difficult to tell if it is valid or not. I am also aware that if it has any hexadecimal character above a f it isn't valid, but I really need some good solid info on how to determine quickly if an IPv6 address is valid or not. Thanks,