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Exam 200-125 topic 2 question 38 discussion

Actual exam question from Cisco's 200-125
Question #: 38
Topic #: 2
[All 200-125 Questions]

Which IPv6 address is valid?

  • A. 2001:0db8:0000:130F:0000:0000:08GC:140B
  • B. 2001:0db8:0:130H::87C:140B
  • C. 2031::130F::9C0:876A:130B
  • D. 2031:0:130F::9C0:876A:130B
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Suggested Answer: D 🗳️
An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits (two octets). The groups are separated by colons (:).
An example of an IPv6 address is 2001:0db8:85a3:0000:0000:8a2e:0370:7334. The leading 0's in a group can be collapsed using ::, but this can only be done once in an IP address.
by Rich121214 at Jan. 19, 2020, 9:45 p.m.

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Rich121214
5 years, 5 months ago
Answer A is not correct because it contains the letter "G". IPv6 bits only have digits from 0-9, then 10-15 are replaced by A-F alphabetically. Since "G" is after F (or would have to be 16) answer A is incorrect.
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