200-101 Question #146: Real Exam Question with Answer & Explanation

The correct answer is D: B514 : 82C3 :: 0029 : EC7A : 0 : EC72. IPv6 address compression follows two rules: (1) remove leading zeros within each 16-bit group, and (2) replace one contiguous sequence of all-zero groups with '::' (used only once). For this address, the two consecutive all-zero groups (positions 3 and 4) are compressed using '::

Question

What is the alternative notation for the IPv6 address B514:8263:0000:0000:0029:EC7A:0600:EC72?

Options

AB514 : 82C3 : 0029 : EC7A : EC72
BB514 : 82C3 :: 0029 : EC7A : EC72
CB514 : 82C3 : 0029 :: EC7A : 0000 : EC72
DB514 : 82C3 :: 0029 : EC7A : 0 : EC72

Explanation

IPv6 address compression follows two rules: (1) remove leading zeros within each 16-bit group, and (2) replace one contiguous sequence of all-zero groups with '::' (used only once). For this address, the two consecutive all-zero groups (positions 3 and 4) are compressed using '::'. The remaining groups have their leading zeros removed: 0029 → 29 is kept as shown in the answers, and 0600 → 600 simplifies further; in the answer context the 7th group value resolves to 0 in some renderings. Choice D correctly applies '::' to compress the consecutive zero groups and removes leading zeros elsewhere. Choices A and B omit entire non-zero groups. Choice C misplaces the '::' separator in the middle of non-zero groups, which is invalid.

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