- A
OSPFv3 requires an IPv4 address on the interface to form adjacencies
Why wrong: OSPFv3 uses link-local IPv6 addresses for adjacencies; IPv4 is not required.
- B
OSPFv3 uses link-local addresses for next-hop
Correct. OSPFv3 uses link-local addresses for next-hop and to form adjacencies.
- C
OSPFv3 uses the same LSA types as OSPFv2 but with different formats
Correct. OSPFv3 uses similar LSA types but modified to carry IPv6 prefixes.
- D
OSPFv3 uses IPsec for authentication
Why wrong: OSPFv3 uses IPsec for authentication, but this is not a required feature; it can also use null authentication.
- E
OSPFv3 supports multiple instances per link
Correct. OSPFv3 uses instance IDs to support multiple OSPF instances on a single link.
Question 910 of 1,000
350-501 Networking Practice Question
This 350-501 practice question tests your understanding of networking. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
An SP network uses OSPFv3 for IPv6 routing. Which three statements about OSPFv3 are true? (Choose three.)
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 uses link-local addresses for next-hop
OSPFv3 runs on a per-link basis, uses link-local addresses for adjacencies, and supports multiple instances per link. OSPFv3 does not require IPv4; it is for IPv6. It uses the same LSA types but with modified formats.
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 requires an IPv4 address on the interface to form adjacencies
Why it's wrong here
OSPFv3 uses link-local IPv6 addresses for adjacencies; IPv4 is not required.
- ✓
OSPFv3 uses link-local addresses for next-hop
Why this is correct
Correct. OSPFv3 uses link-local addresses for next-hop and to form adjacencies.
Related concept
OSPF neighbours must agree on key parameters.
- ✓
OSPFv3 uses the same LSA types as OSPFv2 but with different formats
- ✗
OSPFv3 uses IPsec for authentication
Why it's wrong here
OSPFv3 uses IPsec for authentication, but this is not a required feature; it can also use null authentication.
- ✓
OSPFv3 supports multiple instances per link
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.
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.
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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 350-501 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 350-501 question test?
Networking — This question tests Networking — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: OSPFv3 uses link-local addresses for next-hop — OSPFv3 runs on a per-link basis, uses link-local addresses for adjacencies, and supports multiple instances per link. OSPFv3 does not require IPv4; it is for IPv6. It uses the same LSA types but with modified formats.
What should I do if I get this 350-501 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 350-501 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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Last reviewed: Jul 4, 2026
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.
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