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CCNA IP Routing Practice Question
Drag and drop the following steps into the correct order to configure OSPFv3 for IPv6 on a Cisco IOS-XE router.
⚠ Common exam trap
Many learners assume OSPFv3 configuration is identical to OSPFv2; while the 'router ospfv3' command is valid and often needed for router-id assignment, the primary interface-level command 'ipv6 ospf area' is where adjacency parameters are applied.
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
✓
Enable IPv6 routing globally with 'ipv6 unicast-routing'
The correct order is A, B, C, D. First, enable IPv6 routing globally with 'ipv6 unicast-routing'. Next, enter OSPFv3 configuration mode using 'router ospfv3 1'. Then, configure each interface with 'ipv6 ospf <process-id> area <area-id>'. Finally, verify OSPFv3 neighbor adjacency with 'show ipv6 ospf neighbor' to confirm successful 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.
- ✓
Enable IPv6 routing globally with 'ipv6 unicast-routing'
Why this is correct
This step is correct because OSPFv3 requires IPv6 to be enabled globally on the router. Without 'ipv6 unicast-routing', the router will not process IPv6 traffic or run OSPFv3.
- ✓
Enter OSPFv3 configuration mode with 'router ospfv3 1'
Why this is correct
This is incorrect because OSPFv3 is configured per-interface, not via a global router configuration mode like OSPFv2. The command 'router ospfv3' does not exist; instead, OSPFv3 is enabled directly on interfaces.
- ✓
Configure OSPFv3 on each interface with 'ipv6 ospf <process-id> area <area-id>'
Why this is correct
This step is correct in content but placed out of order. While this command is used to enable OSPFv3 on an interface, it must come after enabling IPv6 routing globally. The question asks for the correct order, and this step should not be first.
- ✓
Verify OSPFv3 adjacency with 'show ipv6 ospf neighbor'
Why this is correct
This is incorrect as the first step because verification comes after configuration. Verification commands are used to confirm that OSPFv3 adjacencies have formed, which requires OSPFv3 to be already configured on interfaces.
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
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Key term
OSPF neighbor
An OSPF neighbor is another router that has been directly discovered through OSPF Hello packets and is willing to exchange routing information to build a network topology map.
Key term
Router
A router is a networking device that connects different networks together and directs data traffic between them by choosing the best path for data to travel.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-301 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 200-301 exam.