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 every IPv6-enabled interface for communication restricted to the local network segment.. 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 two statements accurately describe IPv6 link-local addresses?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
They are used for communication on the local segment only.
IPv6 link-local addresses are designed for communication on the local segment only. In plain language, they allow devices to talk to nearby neighbors without needing globally routable addresses. They play an important role in IPv6 functions such as Neighbor Discovery and are commonly used when hosts communicate with the default gateway on the same link. These addresses are normal and expected in IPv6 environments.
They are not globally Internet-routable, and they are not just emergency fallbacks for DHCPv6 failure. The two correct answers are the ones that preserve their local-link purpose and their importance in standard IPv6 behavior rather than treating them as optional or globally reachable.
Key principle: IPv6 link-local addresses are automatically assigned to every IPv6-enabled interface for communication restricted to the local network segment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
They are used for communication on the local segment only.
Why this is correct
This is correct because link-local addresses are intended for local-link communication.
Related concept
IPv6 link-local addresses are automatically assigned to every IPv6-enabled interface for communication restricted to the local network segment.
✗
They are globally routable across the Internet.
Why it's wrong here
This is wrong because link-local addresses are not Internet-routable.
When this WOULD be correct
If the exam question asked about the characteristics of global unicast addresses or the general routing capabilities of IPv6 addresses, then option B would be correct, as global unicast addresses are indeed routable across the Internet.
✓
They are commonly involved in local IPv6 neighbor interactions.
Why this is correct
This is correct because link-local addressing is central to functions such as Neighbor Discovery.
Related concept
IPv6 link-local addresses are automatically assigned to every IPv6-enabled interface for communication restricted to the local network segment.
✗
They exist only when DHCPv6 fails.
Why it's wrong here
This is wrong because link-local addresses are standard and normal in IPv6.
When this WOULD be correct
In a question that asks about the conditions under which IPv6 link-local addresses are assigned, if it specifies that they are only assigned when DHCPv6 is not available, then option D would be correct. For example, 'What happens to IPv6 link-local address assignment when DHCPv6 is not configured?'
✗
They replace the need for any default gateway logic.
Why it's wrong here
This is wrong because hosts still rely on gateway behavior for off-link communication.
When this WOULD be correct
If the exam question asked about the role of link-local addresses in a network where no routers exist and all devices communicate directly without a gateway, this option could be correct, as link-local addresses would be sufficient for local communication.
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.
✓They are used for communication on the local segment only.Correct answer▾
Why this is correct
This is correct because link-local addresses are intended for local-link communication.
✗They are globally routable across the Internet.Wrong answer — click to see why▾
Why this is wrong here
Link-local addresses have a scope of link-local (fe80::/10) and are not forwarded by routers, making them non-routable across the Internet. They are intended only for communication on a single network segment.
★ When this WOULD be the correct answer
If the exam question asked about the characteristics of global unicast addresses or the general routing capabilities of IPv6 addresses, then option B would be correct, as global unicast addresses are indeed routable across the Internet.
Why candidates choose this
Students may confuse link-local addresses with global unicast addresses, which are globally routable. The term 'address' might imply routability, but the 'link-local' scope explicitly restricts it.
✗They exist only when DHCPv6 fails.Wrong answer — click to see why▾
Why this is wrong here
Link-local addresses are automatically generated on all IPv6 interfaces regardless of DHCPv6. They are a mandatory part of IPv6 operation, not a fallback mechanism.
★ When this WOULD be the correct answer
In a question that asks about the conditions under which IPv6 link-local addresses are assigned, if it specifies that they are only assigned when DHCPv6 is not available, then option D would be correct. For example, 'What happens to IPv6 link-local address assignment when DHCPv6 is not configured?'
Why candidates choose this
Students might think link-local addresses are similar to Automatic Private IP Addressing (APIPA) in IPv4, which is used when DHCP fails. However, IPv6 link-local addresses are always present and not dependent on DHCP.
✗They replace the need for any default gateway logic.Wrong answer — click to see why▾
Why this is wrong here
For off-link communication, IPv6 hosts still require a default gateway (usually a router's link-local address) to forward packets beyond the local segment. Link-local addresses do not eliminate the need for routing logic.
★ When this WOULD be the correct answer
If the exam question asked about the role of link-local addresses in a network where no routers exist and all devices communicate directly without a gateway, this option could be correct, as link-local addresses would be sufficient for local communication.
Why candidates choose this
Since link-local addresses are used for neighbor discovery and local communication, some might incorrectly assume they handle all routing needs. However, routing to other networks still requires a gateway.
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
Remember that link-local addresses are not routable and are not a fallback for DHCPv6. They are essential for local communications.
Detailed technical explanation
How to think about this question
IPv6 link-local addresses are special IP addresses automatically assigned to every IPv6-enabled interface for communication within the local network segment. These addresses always begin with the prefix FE80::/10 and are not routable beyond the local link. They enable essential IPv6 functions such as Neighbor Discovery Protocol (NDP), which replaces ARP in IPv4, allowing devices to discover each other and maintain reachability information on the same subnet.
The use of link-local addresses is mandatory in IPv6; every interface must have one even if other global or unique local addresses are configured. These addresses facilitate local communication, including interactions with routers on the same link for tasks like router advertisements and default gateway discovery. Because they are confined to the local segment, routers do not forward packets with link-local source or destination addresses, ensuring isolation from external networks.
A common exam trap is misunderstanding the scope and purpose of link-local addresses. Candidates might incorrectly assume link-local addresses are globally routable or only assigned when DHCPv6 fails. In reality, link-local addresses are fundamental to IPv6 operation and always present. Practically, they allow devices to communicate immediately after interface activation without relying on external address assignment mechanisms, which is crucial for network stability and initial configuration.
KKey Concepts to Remember
IPv6 link-local addresses are automatically assigned to every IPv6-enabled interface for communication restricted to the local network segment.
Link-local addresses always use the FE80::/10 prefix and are not routable beyond the local link, ensuring local-only communication.
Neighbor Discovery Protocol relies on link-local addresses to perform essential functions like address resolution and router discovery.
Routers do not forward packets with link-local source or destination addresses, preserving their local-link scope.
IPv6 interfaces must have a link-local address even if global or unique local addresses are configured, making them mandatory.
Link-local addresses enable devices to communicate immediately after interface activation without requiring DHCPv6 or manual configuration.
Misinterpreting link-local addresses as globally routable or fallback addresses leads to common exam mistakes.
Link-local addressing supports communication with the default gateway on the same link, facilitating local routing decisions.
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 every IPv6-enabled interface for communication restricted to the local network segment.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review iPv6 link-local addresses are automatically assigned to every IPv6-enabled interface for communication restricted to the local network segment., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — IPv6 link-local addresses are automatically assigned to every IPv6-enabled interface for communication restricted to the local network segment..
What is the correct answer to this question?
The correct answer is: They are used for communication on the local segment only. — IPv6 link-local addresses are designed for communication on the local segment only. In plain language, they allow devices to talk to nearby neighbors without needing globally routable addresses. They play an important role in IPv6 functions such as Neighbor Discovery and are commonly used when hosts communicate with the default gateway on the same link. These addresses are normal and expected in IPv6 environments.
They are not globally Internet-routable, and they are not just emergency fallbacks for DHCPv6 failure. The two correct answers are the ones that preserve their local-link purpose and their importance in standard IPv6 behavior rather than treating them as optional or globally reachable.
What should I do if I get this 200-301 question wrong?
Review iPv6 link-local addresses are automatically assigned to every IPv6-enabled interface for communication restricted to the local network segment., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
IPv6 link-local addresses are automatically assigned to every IPv6-enabled interface for communication restricted to the local network segment.
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