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Question 333 of 1,052
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CCNA Practice Question: Which TWO statements correctly describe OSPFv3…
This 200-301 practice question tests your understanding of 200-301 exam topics. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 correctly describe OSPFv3 for IPv6 configuration and verification?
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
✓
OSPFv3 neighbor adjacencies are established using link-local IPv6 addresses.
OSPFv3 for IPv6 uses link-local addresses for neighbor adjacencies, and area 0 is the mandatory backbone area. The 'show ospfv3 neighbor' command confirms neighbor state. Option A is correct because OSPFv3 neighbor relationships are formed using the link-local address of the neighboring router, not the global unicast address. Option D is correct because area 0 must be configured on all routers that participate in OSPFv3 routing, as it is the backbone area. Option B is wrong because OSPFv3 uses the link-local address as the source, not the global IPv6 address. Option C is wrong because OSPFv3 does not require an IPv4 address; it runs natively over IPv6. Option E is wrong because 'show ipv6 ospf neighbor' is not a valid command; the correct command is 'show ospfv3 neighbor'.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
OSPFv3 neighbor adjacencies are established using link-local IPv6 addresses.
Why this is correct
OSPFv3 uses the link-local IPv6 address of the neighboring router as the source address for hello packets and for forming adjacencies.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The router-id in OSPFv3 must be a global unicast IPv6 address.
Why it's wrong here
The router-id in OSPFv3 is a 32-bit number, typically derived from an IPv4 address or manually configured, not from an IPv6 address.
- ✗
OSPFv3 requires an IPv4 address to be configured on the interface.
Why it's wrong here
OSPFv3 operates over IPv6 and does not require any IPv4 configuration; it uses IPv6 link-local addresses.
- ✓
Area 0 must be configured on all routers in an OSPFv3 domain.
Why this is correct
Area 0 is the backbone area; all other areas must connect to it, so every router in a multi-area OSPFv3 domain must have at least one interface in area 0.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The command 'show ipv6 ospf neighbor' verifies OSPFv3 neighbor status.
Why it's wrong here
The correct command for OSPFv3 is 'show ospfv3 neighbor', not 'show ipv6 ospf neighbor'.
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.
✓OSPFv3 neighbor adjacencies are established using link-local IPv6 addresses.Correct answer▾
Why this is correct
OSPFv3 uses the link-local IPv6 address of the neighboring router as the source address for hello packets and for forming adjacencies.
✗The router-id in OSPFv3 must be a global unicast IPv6 address.Wrong answer — click to see why▾
Why this is wrong here
OSPFv3 uses a separate 32-bit router-id, not an IPv6 address.
✗OSPFv3 requires an IPv4 address to be configured on the interface.Wrong answer — click to see why▾
Why this is wrong here
OSPFv3 is designed for IPv6 and does not depend on IPv4.
✗The command 'show ipv6 ospf neighbor' verifies OSPFv3 neighbor status.Wrong answer — click to see why▾
Why this is wrong here
Cisco IOS uses the 'ospfv3' keyword for OSPFv3 verification commands.
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: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
The correct command for OSPFv3 is 'show ospfv3 neighbor', not 'show ipv6 ospf neighbor'.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 200-301 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 200-301 question test?
OSPF neighbours must agree on key parameters.
What is the correct answer to this question?
The correct answer is: OSPFv3 neighbor adjacencies are established using link-local IPv6 addresses. — OSPFv3 for IPv6 uses link-local addresses for neighbor adjacencies, and area 0 is the mandatory backbone area. The 'show ospfv3 neighbor' command confirms neighbor state. Option A is correct because OSPFv3 neighbor relationships are formed using the link-local address of the neighboring router, not the global unicast address. Option D is correct because area 0 must be configured on all routers that participate in OSPFv3 routing, as it is the backbone area. Option B is wrong because OSPFv3 uses the link-local address as the source, not the global IPv6 address. Option C is wrong because OSPFv3 does not require an IPv4 address; it runs natively over IPv6. Option E is wrong because 'show ipv6 ospf neighbor' is not a valid command; the correct command is 'show ospfv3 neighbor'.
What should I do if I get this 200-301 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 200-301 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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