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Which of the following is NOT a correct notation for an IPv6 address?
Correct Answer: D
Explanation/Reference: Explanation: The 128 bits of an IPv6 address are represented in 8 groups of 16 bits each. Each group is written as 4 hexadecimal digits and the groups are separated by colons (:).Consecutive sections of zeroes are replaced with a double colon (::).The double colon may only be used once in an address, as multiple use would render the address indeterminate. The address 2001:DB8::8:800::417A uses double colon twice, which is illegal. Incorrect Answers: A: 2001:0db8:0:0:0:0:1428:57ab is a well-formed IPv6 address with 8 groups of 16-bit hexadecimal numbers. B: ABCD:EF01:2345:6789:1 is a well-formed IPv6 address with 8 groups of 16-bit hexadecimal numbers. C: ABCD:EF01:2345:6789::1 is a well-formed IPv6 address with 8 groups of 16-bit hexadecimal numbers, and only one double colon. References: https://en.wikipedia.org/wiki/IPv6