The answer is that IPv6 hosts use the router’s link-local address as the next hop because on a local segment, only link-local reachability is required for forwarding. This is a fundamental IPv6 behavior: a host does not need a globally routable address to hand off packets to its directly attached router; the link-local address uniquely identifies the neighbor on that link and is always present, even when no global unicast address is configured. On the CCNA 200-301 v2 exam, this concept tests your understanding that the default gateway in IPv6 is not a global address but a link-local one, a common trap for those accustomed to IPv4. Remember that the router advertisement (RA) provides the prefix and default route, but the host automatically uses the source link-local address of that RA as the next hop. Memory tip: “Link-local for the local hop, global for the rest of the road.”
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 hosts use link-local addresses to communicate with routers on the local link for next-hop forwarding.. 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.
An IPv6 host has a global unicast address and a correct default route learned from a router advertisement, but the next-hop entry shown on the host uses a link-local address rather than a global unicast address. What is the best explanation?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IPv6 hosts commonly use the router’s link-local address as the next hop on the local segment.
That behavior is normal in IPv6. In practical terms, the host only needs to reach the router on the local segment, so it uses the router’s link-local address as the next-hop target. The packet still leaves the local link toward remote destinations, but the immediate neighbor on that link is identified by link-local addressing.
This is an important IPv6 concept because many people assume the default gateway must be a globally routable address. It does not. On the local link, the host is really forwarding to its directly attached router interface, and the router’s link-local address is enough for that local handoff.
Key principle: IPv6 hosts use link-local addresses to communicate with routers on the local link for next-hop forwarding.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
IPv6 hosts commonly use the router’s link-local address as the next hop on the local segment.
Why this is correct
This is correct because IPv6 next-hop behavior often relies on the router’s link-local address on the local link.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
IPv6 hosts use link-local addresses to communicate with routers on the local link for next-hop forwarding.
✗
The host has learned the wrong default route because IPv6 gateways must always be global unicast.
Why it's wrong here
This is wrong because link-local next-hop use is normal in IPv6.
When this WOULD be correct
In a scenario where a question states that an IPv6 host is configured to only communicate with other devices on the same local link and does not require global connectivity, the statement that 'IPv6 gateways must always be global unicast' could be correct. This would imply a misunderstanding of link-local addressing in a strictly local context.
✗
The host can reach only local destinations when the next hop is link-local.
Why it's wrong here
This is wrong because link-local next-hop use still supports off-link forwarding through the local router.
When this WOULD be correct
In a scenario where a question specifies that the host is configured to communicate only within a local network and does not have a global unicast address, stating that a link-local next hop limits communication to local destinations would be accurate.
✗
The router advertisement has failed because it did not provide a MAC address.
Why it's wrong here
This is wrong because the issue described is not an RA failure.
When this WOULD be correct
In a question where the context specifies that router advertisements are expected to include MAC addresses for proper routing functionality, option D could be correct if the absence of a MAC address leads to a failure in establishing a valid next-hop address.
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.
✓IPv6 hosts commonly use the router’s link-local address as the next hop on the local segment.Correct answer▾
Why this is correct
This is correct because IPv6 next-hop behavior often relies on the router’s link-local address on the local link.
✗The host has learned the wrong default route because IPv6 gateways must always be global unicast.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because IPv6 gateways do not have to be global unicast; link-local addresses are valid for routing within the local network segment. The host can use the link-local address of the router as the next hop for packets destined to other networks.
★ When this WOULD be the correct answer
In a scenario where a question states that an IPv6 host is configured to only communicate with other devices on the same local link and does not require global connectivity, the statement that 'IPv6 gateways must always be global unicast' could be correct. This would imply a misunderstanding of link-local addressing in a strictly local context.
Why candidates choose this
Candidates may find this option tempting due to a common misconception that global unicast addresses are necessary for all routing scenarios, leading them to overlook the valid use of link-local addresses in local network communications.
✗The host can reach only local destinations when the next hop is link-local.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because a host with a link-local next hop can still reach global unicast addresses, as link-local addresses are used only for communication within the same local network segment.
★ When this WOULD be the correct answer
In a scenario where a question specifies that the host is configured to communicate only within a local network and does not have a global unicast address, stating that a link-local next hop limits communication to local destinations would be accurate.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of link-local addresses, believing they inherently restrict communication to local destinations without considering the broader context of IPv6 routing capabilities.
✗The router advertisement has failed because it did not provide a MAC address.Wrong answer — click to see why▾
Why this is wrong here
This option is wrong because a router advertisement does not need to provide a MAC address for the next-hop link-local address to be valid; link-local addresses are inherently usable for local communication without MAC address specification.
★ When this WOULD be the correct answer
In a question where the context specifies that router advertisements are expected to include MAC addresses for proper routing functionality, option D could be correct if the absence of a MAC address leads to a failure in establishing a valid next-hop address.
Why candidates choose this
Candidates might choose this option due to a misunderstanding of the role of MAC addresses in IPv6 routing, mistakenly believing that a lack of MAC address information invalidates link-local addresses in router advertisements.
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
Don't assume that a default gateway must be a global unicast address in IPv6; link-local addresses are used for local communication.
Detailed technical explanation
How to think about this question
IPv6 addressing includes several address types, with global unicast addresses used for routable communication across the internet and link-local addresses used for communication on the local network segment. When an IPv6 host receives a router advertisement, it learns the default gateway's address, which is often the router's link-local address. This is because the host only needs to forward packets to the router on the local link before they are routed onward. The link-local address uniquely identifies the router interface on the local segment without requiring a global address.
The IPv6 routing process on a host uses the next-hop address to determine where to send packets destined for off-link addresses. Although the default route learned via router advertisement is global, the next-hop IP in the routing table is typically the router's link-local address. This is a design choice in IPv6 to ensure local link communication is efficient and unambiguous. The host sends packets to the router's link-local address, which the router then forwards appropriately.
A common exam trap is assuming the next-hop must be a global unicast address because the destination is global. However, IPv6 standards specify that the next-hop for a default route on a local link is often the router's link-local address. This behavior is normal and expected. Practically, this means the host uses the router's link-local address for the immediate hop, while the router handles forwarding beyond the local network, ensuring proper routing without confusion or address conflicts.
KKey Concepts to Remember
IPv6 hosts use link-local addresses to communicate with routers on the local link for next-hop forwarding.
Router advertisements provide default routes with next-hop addresses that are often link-local rather than global unicast.
The next-hop address in an IPv6 routing table points to the router's link-local address for local segment forwarding.
IPv6 routing separates the concept of a global destination address from the next-hop address used for local delivery.
Hosts forward packets to the router's link-local address, which then routes packets to global destinations.
Using link-local addresses as next hops prevents ambiguity and ensures efficient local link communication in IPv6.
IPv6 standards allow and expect the next-hop for default routes to be a link-local address on the local segment.
Confusing the next-hop address type can lead to incorrect assumptions about IPv6 routing behavior and troubleshooting errors.
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 hosts use link-local addresses to communicate with routers on the local link for next-hop forwarding.
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 hosts use link-local addresses to communicate with routers on the local link for next-hop forwarding., 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 hosts use link-local addresses to communicate with routers on the local link for next-hop forwarding..
What is the correct answer to this question?
The correct answer is: IPv6 hosts commonly use the router’s link-local address as the next hop on the local segment. — That behavior is normal in IPv6. In practical terms, the host only needs to reach the router on the local segment, so it uses the router’s link-local address as the next-hop target. The packet still leaves the local link toward remote destinations, but the immediate neighbor on that link is identified by link-local addressing.
This is an important IPv6 concept because many people assume the default gateway must be a globally routable address. It does not. On the local link, the host is really forwarding to its directly attached router interface, and the router’s link-local address is enough for that local handoff.
What should I do if I get this 200-301 question wrong?
Review iPv6 hosts use link-local addresses to communicate with routers on the local link for next-hop forwarding., 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 hosts use link-local addresses to communicate with routers on the local link for next-hop forwarding.
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