200-101 Question #177: Real Exam Question with Answer & Explanation

The correct answer is D: 2031:0:130F::9C0:876A:130B. IPv6 addresses consist of eight 16-bit groups in hexadecimal (valid characters: 0–9, A–F), separated by colons. A double-colon (::) may appear at most once to compress consecutive all-zero groups. A is invalid because 'G' is not a hexadecimal digit. B is invalid because 'H' is no

Question

Which IPv6 address is valid?

Options

A2001:0db8:0000:130F:0000:0000:08GC:140B
B2001:0db8:0:130H::87C:140B
C2031::130F::9C0:876A::130B
D2031:0:130F::9C0:876A:130B

Explanation

IPv6 addresses consist of eight 16-bit groups in hexadecimal (valid characters: 0–9, A–F), separated by colons. A double-colon (::) may appear at most once to compress consecutive all-zero groups. A is invalid because 'G' is not a hexadecimal digit. B is invalid because 'H' is not a hexadecimal digit. C is invalid because it uses '::' twice - only one double-colon is permitted per address. D (2031:0:130F::9C0:876A:130B) is valid: all characters are legal hex digits, '::' appears exactly once, and it expands to exactly 8 groups: 2031:0000:130F:0000:0000:09C0:876A:130B.

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