- A
It is publicly routable across the Internet.
Why wrong: This is wrong because link-local addresses are not Internet-routable. That is one of the defining features of the address type.
- B
It replaces the need for a default gateway on IPv6 hosts.
Why wrong: This is wrong because IPv6 hosts still rely on a default route or default-router information to reach off-link destinations.
- C
It is used for communication only within the local link or network segment.
This is correct because link-local addresses are designed specifically for communication on the local segment and support core IPv6 functions such as Neighbor Discovery.
- D
It is used only when DHCPv6 fails.
Why wrong: This is wrong because link-local addresses are normal in IPv6, not something used only after DHCPv6 fails.
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: iPv6 link-local addresses are automatically assigned to all IPv6-enabled interfaces and use the FE80::/10 prefix.. 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 statement best describes the purpose of an IPv6 link-local address?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
It is used for communication only within the local link or network segment.
An IPv6 link-local address is meant for communication on the local network segment only. In plain language, it lets devices talk to nearby neighbors without needing a globally routable address. Routers use link-local addresses for neighbor relationships, and hosts use them for functions like Neighbor Discovery and communicating with the default gateway on the same link. These addresses are essential in IPv6 and are not just an emergency fallback. Technically, link-local addresses usually begin with the FE80::/10 prefix and are automatically created on IPv6-enabled interfaces. They are never routed beyond the local link, which is why they are different from global unicast addresses. They do not replace the concept of a default gateway; instead, hosts often use the router’s link-local address as the next-hop target on the local segment.
Key principle: IPv6 link-local addresses are automatically assigned to all IPv6-enabled interfaces and use the FE80::/10 prefix.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It is publicly routable across the Internet.
Why it's wrong here
This is wrong because link-local addresses are not Internet-routable. That is one of the defining features of the address type.
When this WOULD be correct
In a scenario where the question asks about the characteristics of public IP addresses, stating that an IPv6 link-local address is publicly routable could be correct if the context involves discussing misconfigurations or misconceptions about address types in a training environment.
- ✗
It replaces the need for a default gateway on IPv6 hosts.
Why it's wrong here
This is wrong because IPv6 hosts still rely on a default route or default-router information to reach off-link destinations.
When this WOULD be correct
In a different question asking about the role of link-local addresses in specific network configurations, such as when discussing scenarios where hosts communicate without a router, this option could be correct if it specifies that link-local addresses can serve as a fallback mechanism in the absence of a default gateway.
- ✓
It is used for communication only within the local link or network segment.
Why this is correct
This is correct because link-local addresses are designed specifically for communication on the local segment and support core IPv6 functions such as Neighbor Discovery.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
IPv6 link-local addresses are automatically assigned to all IPv6-enabled interfaces and use the FE80::/10 prefix.
- ✗
It is used only when DHCPv6 fails.
Why it's wrong here
This is wrong because link-local addresses are normal in IPv6, not something used only after DHCPv6 fails.
When this WOULD be correct
In a question that asks about the conditions under which link-local addresses are utilized in a network where DHCPv6 is implemented, option D could be correct if the question specifies that link-local addresses are used as a fallback mechanism when DHCPv6 fails to assign global addresses.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓It is used for communication only within the local link or network segment.Correct answer▾
Why this is correct
This is correct because link-local addresses are designed specifically for communication on the local segment and support core IPv6 functions such as Neighbor Discovery.
✗It is publicly routable across the Internet.Wrong answer — click to see why▾
Why this is wrong here
Option A is incorrect because an IPv6 link-local address is not routable beyond the local network segment; it is specifically designed for communication within the same link and cannot be used for Internet-wide routing.
★ When this WOULD be the correct answer
In a scenario where the question asks about the characteristics of public IP addresses, stating that an IPv6 link-local address is publicly routable could be correct if the context involves discussing misconfigurations or misconceptions about address types in a training environment.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of address types, mistakenly believing that link-local addresses can be used similarly to public IP addresses in broader networking contexts.
✗It replaces the need for a default gateway on IPv6 hosts.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because an IPv6 link-local address does not eliminate the need for a default gateway; it is primarily used for communication within the same local network segment and cannot be routed beyond it.
★ When this WOULD be the correct answer
In a different question asking about the role of link-local addresses in specific network configurations, such as when discussing scenarios where hosts communicate without a router, this option could be correct if it specifies that link-local addresses can serve as a fallback mechanism in the absence of a default gateway.
Why candidates choose this
Candidates may find this option appealing because they might confuse link-local addresses with broader networking concepts, mistakenly believing that they can fulfill the role of a default gateway in certain situations.
✗It is used only when DHCPv6 fails.Wrong answer — click to see why▾
Why this is wrong here
Option D is incorrect because an IPv6 link-local address is not dependent on DHCPv6; it is automatically configured on all IPv6-enabled interfaces and is always available for local communication.
★ When this WOULD be the correct answer
In a question that asks about the conditions under which link-local addresses are utilized in a network where DHCPv6 is implemented, option D could be correct if the question specifies that link-local addresses are used as a fallback mechanism when DHCPv6 fails to assign global addresses.
Why candidates choose this
Candidates may find this option tempting because they might associate link-local addresses with fallback scenarios in IPv6 networking, particularly in environments where DHCPv6 is commonly used for address assignment.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is assuming that IPv6 link-local addresses are globally routable or that they replace the need for a default gateway. Many candidates mistakenly believe that because link-local addresses are automatically assigned, they can be used for Internet communication or to bypass routing configurations. This misunderstanding leads to incorrect elimination of the correct answer. Remember, link-local addresses are strictly confined to the local link and cannot be routed beyond it. They support local communication and essential IPv6 functions but do not substitute for global addressing or routing infrastructure.
Detailed technical explanation
How to think about this question
IPv6 link-local addresses are a fundamental part of IPv6 networking, designed to enable communication between devices on the same local network segment without requiring a globally routable address. These addresses always begin with the prefix FE80::/10 and are automatically assigned to all IPv6-enabled interfaces. Their primary role is to support essential IPv6 functions such as Neighbor Discovery Protocol (NDP), which replaces ARP in IPv4, and to facilitate communication with local routers and other devices on the same link. The decision to use link-local addresses is governed by the scope of communication. Since link-local addresses are not routable beyond the local link, they are used exclusively for local communication tasks like router advertisements, neighbor solicitations, and as next-hop addresses for default gateways within the same subnet. IPv6 hosts rely on these addresses to maintain local network operations even when no global or unique local addresses are configured, but they do not replace the need for a default gateway or global addressing for broader network communication. A common exam trap is misunderstanding the scope and purpose of link-local addresses, leading to the incorrect belief that they can be used for Internet communication or that they replace default gateways. In practice, link-local addresses are vital for local link operations and router communications but cannot be routed across different network segments. Cisco devices use link-local addresses extensively for routing protocols and neighbor discovery, emphasizing their local-only scope and critical role in IPv6 network functionality.
KKey Concepts to Remember
- IPv6 link-local addresses are automatically assigned to all IPv6-enabled interfaces and use the FE80::/10 prefix.
- Link-local addresses enable communication only within the local network segment and are never routed beyond the local link.
- IPv6 devices use link-local addresses for essential functions such as Neighbor Discovery Protocol and router advertisements.
- Hosts rely on link-local addresses to communicate with the default gateway on the same link but still require a default route for off-link traffic.
- Link-local addresses do not replace global unicast addresses or the need for routing to reach external networks.
- Routers use link-local addresses to establish neighbor relationships and exchange routing protocol information on local links.
- Link-local addresses are critical for IPv6 operation and are not merely fallback addresses used when DHCPv6 fails.
- Understanding the scope and purpose of link-local addresses helps avoid common exam mistakes about IPv6 routing and addressing.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
IPv6 link-local addresses are automatically assigned to all IPv6-enabled interfaces and use the FE80::/10 prefix.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review iPv6 link-local addresses are automatically assigned to all IPv6-enabled interfaces and use the FE80::/10 prefix., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — IPv6 link-local addresses are automatically assigned to all IPv6-enabled interfaces and use the FE80::/10 prefix..
What is the correct answer to this question?
The correct answer is: It is used for communication only within the local link or network segment. — An IPv6 link-local address is meant for communication on the local network segment only. In plain language, it lets devices talk to nearby neighbors without needing a globally routable address. Routers use link-local addresses for neighbor relationships, and hosts use them for functions like Neighbor Discovery and communicating with the default gateway on the same link. These addresses are essential in IPv6 and are not just an emergency fallback. Technically, link-local addresses usually begin with the FE80::/10 prefix and are automatically created on IPv6-enabled interfaces. They are never routed beyond the local link, which is why they are different from global unicast addresses. They do not replace the concept of a default gateway; instead, hosts often use the router’s link-local address as the next-hop target on the local segment.
What should I do if I get this 200-301 question wrong?
Review iPv6 link-local addresses are automatically assigned to all IPv6-enabled interfaces and use the FE80::/10 prefix., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
IPv6 link-local addresses are automatically assigned to all IPv6-enabled interfaces and use the FE80::/10 prefix.
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Last reviewed: May 17, 2026
This 200-301 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 200-301 exam.
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