This 200-901 practice question tests your understanding of network fundamentals. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which IPv6 address type is equivalent to a private IPv4 address?
Multicast
Why wrong: Multicast addresses are for one-to-many communication and are not private.
Global unicast
Why wrong: Global unicast addresses are public and routable on the Internet.
Link-local
Why wrong: Link-local addresses are only usable on a single link and not routable.
Unique local
Unique local addresses are private and not globally routable.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Multicast
Why it's wrong here
Multicast addresses are for one-to-many communication and are not private.
Global unicast
Why it's wrong here
Global unicast addresses are public and routable on the Internet.
Link-local
Why it's wrong here
Link-local addresses are only usable on a single link and not routable.
Unique local
Why this is correct
Unique local addresses are private and not globally routable.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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.
Detailed technical explanation
Unique local addresses use a 40-bit global ID and 16-bit subnet ID to create a /48 prefix, allowing organizations to generate their own private addressing scheme without collisions. A key subtlety is that while ULAs are not meant to be routed on the public internet, they can be routed within a site or between sites using VPNs, unlike link-local addresses which are strictly single-link. In real-world scenarios, ULAs are often used alongside global unicast addresses in dual-stack networks to provide internal stability even if the global prefix changes.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Network Fundamentals — This question tests Network Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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