easyMultiple Choice
200-901 Practice Question: Which IPv6 address type is equivalent to a…
Which IPv6 address type is equivalent to a private IPv4 address?
⚠ Common exam trap
Cisco often tests the distinction between link-local and unique local addresses, trapping candidates who confuse link-local (fe80::/10) with private IPv4 because both are non-routable, but link-local is strictly single-link and not site-wide like private IPv4.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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Unique local
Unique local addresses (ULA) in IPv6, defined in RFC 4193, are the equivalent of private IPv4 addresses (RFC 1918) because they are intended for local communication within a site or organization and are not routable on the global internet. They use the prefix fc00::/7, with the L bit set to 1 (fd00::/8) for locally assigned addresses, ensuring uniqueness within a site without requiring global registration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Multicast
Why it's wrong here
Multicast delivers one-to-many traffic to subscribed group members, so it cannot serve as a host's private addressing equivalent. It is tempting because multicast, like private IPv4, is non-routable on the public internet, but IPv6's private equivalent is the unique local address range fc00::/7.
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Global unicast
Why it's wrong here
Global unicast addresses are internet-routable and globally unique, matching public IPv4 rather than private ranges. It is tempting because both are unicast, but global unicast would be the correct answer if the question asked which IPv6 type corresponds to a public IPv4 address.
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Link-local
Why it's wrong here
Link-local addresses (fe80::/10) are automatically configured on every IPv6 interface and are not routable beyond the local segment, so they are not the private-addressing equivalent. They are tempting because they are non-global, but they serve neighbour discovery and next-hop addressing, not site-internal addressing.
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Unique local
Why this is correct
Unique local addresses (fc00::/7) are non-routable on the public internet, mirroring IPv4 private ranges like RFC 1918. They are used for internal communication within a site or organisation, providing the equivalent private-addressing function for IPv6 networks.
About these practice questions
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-901 exam.