300-410 Layer 3 Technologies Practice Question
A network engineer is configuring a Cisco IOS router to run OSPFv3 for IPv6. The router must form an adjacency with a neighbor on a broadcast network. Which command is required to enable OSPFv3 on an interface?
⚠ Common exam trap
Watch out — candidates often confuse the global OSPFv3 configuration command with the interface-level command that actually enables the protocol on the interface.
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
✓
ipv6 ospf 1 area 0
To enable OSPFv3 on an interface for IPv6, the command `ipv6 ospf 1 area 0` is used in interface configuration mode. This activates OSPFv3 on the interface and associates it with the specified area. The global command `ipv6 router ospf 1` is also needed to configure the router ID and other parameters, but the interface-level command is essential for adjacency formation.
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 ospf 1 area 0
Why this is correct
This command, issued in interface configuration mode, enables OSPFv3 for IPv6 on the interface and assigns it to area 0. It is the standard method to activate OSPFv3 on an interface in Cisco IOS. Without this command, the interface will not participate in OSPFv3 and no adjacency will form.
- ✗
ospfv3 1 ipv6 area 0
Why it's wrong here
This command is used to enable OSPFv3 for both IPv4 and IPv6 address families when using the OSPFv3 address family feature. However, for pure IPv6 OSPFv3, the traditional command `ipv6 ospf 1 area 0` is used. The command `ospfv3 1 ipv6 area 0` is valid but not the typical or required command for basic IPv6 OSPFv3 configuration.
- ✗
ipv6 ospf area 0
Why it's wrong here
This command is missing the process ID. While some Cisco platforms allow omitting the process ID if only one OSPFv3 process is configured, the full and correct syntax includes the process ID. In a multi-process scenario, omitting the process ID would be ambiguous. The complete command is `ipv6 ospf 1 area 0`.
- ✗
ipv6 router ospf 1
Why it's wrong here
This command enters OSPFv3 router configuration mode but does not enable OSPFv3 on any interface. It is necessary to configure global OSPFv3 parameters, such as the router ID, but it does not activate the protocol on an interface. Additional interface-level configuration is required.
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.
Go deeper
Related to this question
About these practice questions
This 300-410 question is part of Courseiva's 1,401-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.