Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Which statement best describes the purpose of an IPv6 link-local address?
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
Distractor review
It is publicly routable across the Internet.
This is wrong because link-local addresses are not Internet-routable. That is one of the defining features of the address type.
B
Distractor review
It replaces the need for a default gateway on IPv6 hosts.
This is wrong because IPv6 hosts still rely on a default route or default-router information to reach off-link destinations.
C
Best answer
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
Distractor review
It is used only when DHCPv6 fails.
This is wrong because link-local addresses are normal in IPv6, not something used only after DHCPv6 fails.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related 200-301 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
CCNA subnetting practice questions
Practise IPv4 subnetting, CIDR, masks, host ranges and subnet selection.
CCNA OSPF practice questions
Practise OSPF neighbours, router IDs, metrics, areas and routing-table interpretation.
CCNA VLAN practice questions
Practise VLANs, access ports, trunks, allowed VLANs and switching scenarios.
CCNA STP practice questions
Practise spanning tree, root bridge election, port roles and STP troubleshooting.
CCNA EtherChannel practice questions
Practise LACP, PAgP, port-channel behaviour and bundle requirements.
CCNA ACL practice questions
Practise standard and extended ACLs, permit/deny logic and traffic filtering.
CCNA NAT practice questions
Practise static NAT, dynamic NAT, PAT and inside/outside address translation.
CCNA DHCP practice questions
Practise DHCP scopes, relay, leases and troubleshooting.
CCNA show ip route practice questions
Practise routing-table output, longest-prefix match, AD and route selection.
CCNA show interfaces trunk practice questions
Practise trunk verification and VLAN forwarding across switches.
CCNA wireless security practice questions
Practise WLAN security, authentication and wireless architecture concepts.
CCNA IPv6 practice questions
Practise IPv6 addressing, routes, neighbour discovery and common IPv6 exam traps.
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 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?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
Loading comments…
Sign in to join the discussion.