300-410 Layer 3 Technologies Practice Question
A network administrator is troubleshooting an OSPFv3 network. Routers R1 and R2 are in the same area and on the same broadcast segment, but they are not forming an adjacency. The administrator verifies that the interfaces are up and IPv6 addresses are configured correctly. Which command should be used to check if OSPFv3 is enabled on the interfaces?
⚠ Common exam trap
It's easy for candidates to confuse neighbor state with interface configuration; a missing neighbor does not necessarily mean OSPFv3 is not enabled, but checking the interface status is the first step.
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
✓
show ipv6 ospf interface
To verify OSPFv3 interface configuration, the 'show ipv6 ospf interface' command is used. It shows whether OSPFv3 is enabled on the interface, the area, network type, and other parameters. This is the most direct way to confirm OSPFv3 is active on the interfaces.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
show ipv6 protocols
Why it's wrong here
The command 'show ipv6 protocols' displays IPv6 routing protocol information, including which protocols are running and on which interfaces. However, it does not provide detailed OSPFv3 interface parameters. It might show that OSPFv3 is running, but not specifically whether it is enabled on a particular interface. It is less specific than the dedicated OSPFv3 interface command.
- ✗
show ipv6 ospf neighbor
Why it's wrong here
The command 'show ipv6 ospf neighbor' displays the OSPFv3 neighbor table, which shows adjacencies. If no adjacency is formed, the output will be empty, but this does not indicate whether OSPFv3 is enabled on the local interface. It only shows the result of the adjacency process, not the configuration state.
- ✓
show ipv6 ospf interface
Why this is correct
The command 'show ipv6 ospf interface' displays OSPFv3 interface status, including whether OSPFv3 is enabled on the interface, the area ID, and the state. If OSPFv3 is not enabled, the interface will not appear or will show as passive. This directly answers the question of whether OSPFv3 is enabled on the interfaces.
- ✗
show ipv6 ospf database
Why it's wrong here
The command 'show ipv6 ospf database' displays the OSPFv3 link-state database. It does not indicate whether OSPFv3 is enabled on an interface. If the adjacency is not formed, the database may be incomplete, but it does not provide interface-level configuration status.
Visual reference
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.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
This 300-410 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 300-410 exam.