Question 1mediummulti select
Full question →mediummulti selectObjective-mapped
Which two statements accurately describe IPv6 link-local addresses?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
They are used for communication on the local segment only.
This is correct because link-local addresses are intended for local-link communication.
B
Distractor review
They are globally routable across the Internet.
This is wrong because link-local addresses are not Internet-routable.
C
Best answer
They are commonly involved in local IPv6 neighbor interactions.
This is correct because link-local addressing is central to functions such as Neighbor Discovery.
D
Distractor review
They exist only when DHCPv6 fails.
This is wrong because link-local addresses are standard and normal in IPv6.
E
Distractor review
They replace the need for any default gateway logic.
This is wrong because hosts still rely on gateway behavior for off-link communication.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is selecting options that imply IPv6 link-local addresses are globally routable or only exist as fallback addresses when DHCPv6 fails. This mistake arises from confusing link-local addresses with global unicast addresses or temporary addresses. Link-local addresses are always present and essential for local communication and IPv6 neighbor functions, not just emergency fallbacks. Misunderstanding their scope leads to incorrect assumptions about their routing capabilities and role in IPv6 networking.
Technical deep dive
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
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?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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