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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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