Cisco
200-150 · Question #118
200-150 Question #118: Real Exam Question with Answer & Explanation
The correct answer is A: 2001:0DB8:0000:FE01::. IPv6 addresses can be compressed by removing leading zeros per group and replacing one contiguous sequence of all-zero groups with '::'. Only one '::' substitution is permitted per address.
Question
Which three addresses are valid forms of an IPv6 Address: 2001:0DB8:0000:FE01:0000:0000:0000:0000? (Choose three.)
Options
- A2001:0DB8:0000:FE01::
- B2001:DB8:0:FE01::
- C2001:0DB8::FE01::
- D2001:DB8:0:FE01:0:0:0:0
Explanation
IPv6 addresses can be compressed by removing leading zeros per group and replacing one contiguous sequence of all-zero groups with '::'. Only one '::' substitution is permitted per address.
Common mistakes.
- C. 2001:0DB8::FE01:: is invalid because it uses '::' twice - IPv6 rules permit only one '::' substitution per address to prevent ambiguity when expanding the omitted groups.
Concept tested. IPv6 address compression and notation rules
Reference. https://www.rfc-editor.org/rfc/rfc5952
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