300-410 Layer 3 Technologies Practice Question
A network engineer is deploying OSPFv3 in an IPv6 network. The engineer wants to enable OSPFv3 on a router and ensure that it can form adjacencies with neighbors. Which two commands are required on the router to enable OSPFv3 globally and on an interface? (Choose two.)
⚠ Common exam trap
Watch out — candidates often confuse OSPFv3 commands with OSPFv2 commands; OSPFv3 uses 'ipv6 router ospf' and 'ipv6 ospf' instead of 'router ospf' and 'ip ospf'.
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, you must start the OSPFv3 process with 'ipv6 router ospf 1' and then enable it on an interface with 'ipv6 ospf 1 area 0'. The other commands are either for OSPFv2, general IPv6 routing, or interface IPv6 enabling, which are not the specific OSPFv3 enabling commands.
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
The 'ipv6 ospf 1 area 0' command is used under an interface to enable OSPFv3 on that interface and assign it to area 0. This is required for the interface to participate in OSPFv3 and form adjacencies. Without it, the interface will not send or receive OSPFv3 hello packets. Thus, it is a necessary command.
- ✓
ipv6 router ospf 1
Why this is correct
The 'ipv6 router ospf 1' command enables the OSPFv3 routing process globally and enters router configuration mode. Without this process, OSPFv3 cannot run. This command is essential for initializing OSPFv3 on the router. It allows configuration of router ID, areas, and other parameters. Therefore, it is one of the required commands.
- ✗
ipv6 unicast-routing
Why it's wrong here
The 'ipv6 unicast-routing' command enables IPv6 unicast routing globally, which is necessary for IPv6 routing to occur. However, it is not specific to OSPFv3; it is a prerequisite for any IPv6 routing protocol. While it is required for IPv6 routing, the question asks for commands to enable OSPFv3 specifically. Thus, it is not one of the two required OSPFv3 commands.
- ✗
router ospf 1
Why it's wrong here
The 'router ospf 1' command enables OSPFv2, which is for IPv4. It does not enable OSPFv3. Using this command would not allow OSPFv3 to run on the router. Therefore, it is incorrect for an IPv6 OSPFv3 deployment.
- ✗
ipv6 enable
Why it's wrong here
The 'ipv6 enable' command is used on an interface to enable IPv6 processing even without an explicit IPv6 address. It is not required for OSPFv3 if the interface already has an IPv6 address. It does not enable OSPFv3 itself. Therefore, it is not a required command for OSPFv3 configuration.
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
Learn chapter
OSPF Neighbor Adjacency and Basics
Key term
IPv6 Next Hop Resolution
IPv6 Next Hop Resolution is the process a router uses to determine the next router or destination device to which a packet should be forwarded, based on the destination IPv6 address and the routing table.
Key term
IPv6 Routing OSPFv3
OSPFv3 is a routing protocol that lets routers share information about how to reach destinations in an IPv6 network, updating routes automatically as the network changes.
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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
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