CCNA IP Routing Practice Question
Network Topology
You are connected to R1. Configure OSPFv3 for IPv6 so that R1 and R2 can exchange IPv6 routes over their directly connected link. Enable IPv6 routing, assign OSPFv3 process and area on the interface, and verify that the neighbor adjacency forms and routes appear in the IPv6 routing table.
⚠ Common exam trap
Do not confuse OSPFv3 with OSPFv2. OSPFv3 uses 'ipv6 ospf' on the interface and 'show ospfv3 neighbor' for verification. Also, remember to enable IPv6 routing with 'ipv6 unicast-routing'.
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 with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route ospf'.
It includes enabling IPv6 routing with 'ipv6 unicast-routing', applying OSPFv3 to the interface using 'ipv6 ospf 1 area 0', and verifying with the correct OSPFv3-specific commands 'show ospfv3 neighbor' and 'show ipv6 route ospf'. Option B is incorrect because it adds a global 'router ospfv3 1' command, which is unnecessary; OSPFv3 can be configured directly on the interface without a global process. Option C is incorrect because it uses IPv4 OSPF verification commands 'show ip ospf neighbor' and 'show ip route ospf', which are not valid for OSPFv3. Option D is incorrect because although it uses the correct 'show ospfv3 neighbor', the 'show ipv6 route' command does not filter to OSPF-learned routes, so it displays all IPv6 routes rather than just OSPF routes.
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 with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route ospf'.
Why this is correct
This answer is correct because 'ipv6 unicast-routing' globally enables IPv6 packet forwarding on the router, a prerequisite for forming adjacencies and exchanging routes. The interface command 'ipv6 ospf 1 area 0' activates the OSPFv3 process for IPv6 on that specific interface, placing it in area 0. For verification, 'show ospfv3 neighbor' displays adjacent OSPFv3 routers, while 'show ipv6 route ospf' filters the IPv6 routing table to display only routes learned by OSPFv3.
- ✗
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 globally with 'router ospfv3 1' and 'router-id 1.1.1.1', then assign the interface to area 0 with 'ipv6 ospf 1 area 0'.
Why it's wrong here
This is incorrect because OSPFv3 does not require a global router configuration or router-id to form an adjacency; it can be configured directly on the interface. The router-id is optional and not needed for basic operation.
- ✗
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ip ospf neighbor' and 'show ip route ospf'.
Why it's wrong here
This option fails at the verification stage because it uses OSPFv2 commands that operate only on the IPv4 routing table. 'show ip ospf neighbor' and 'show ip route ospf' query the IPv4 OSPF process and IPv4 RIB, so they would return no OSPFv3 neighbors or IPv6 routes even if the OSPFv3 configuration is perfectly valid. The correct OSPFv3 commands are 'show ospfv3 neighbor' and 'show ipv6 route ospf'.
- ✗
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route'.
Why it's wrong here
This option is incorrect because 'show ipv6 route' without a protocol filter displays the entire IPv6 routing table, including directly connected, static, and other dynamic routes, not specifically OSPF-learned entries. While this command would show OSPFv3 routes if they exist, it is not a targeted verification for OSPFv3. To confirm OSPFv3 learning, you must filter with 'show ipv6 route ospf' to isolate routes from the OSPF process.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route ospf'.Correct answer▾
Why this is correct
This answer is correct because 'ipv6 unicast-routing' globally enables IPv6 packet forwarding on the router, a prerequisite for forming adjacencies and exchanging routes. The interface command 'ipv6 ospf 1 area 0' activates the OSPFv3 process for IPv6 on that specific interface, placing it in area 0. For verification, 'show ospfv3 neighbor' displays adjacent OSPFv3 routers, while 'show ipv6 route ospf' filters the IPv6 routing table to display only routes learned by OSPFv3.
✗Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 globally with 'router ospfv3 1' and 'router-id 1.1.1.1', then assign the interface to area 0 with 'ipv6 ospf 1 area 0'.Wrong answer — click to see why▾
Why this is wrong here
OSPFv3 can be configured entirely on the interface without a global router process; the router-id is not mandatory.
Why candidates choose this
Candidates may confuse OSPFv3 with OSPFv2, which requires a router process and router-id.
✗Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ip ospf neighbor' and 'show ip route ospf'.Wrong answer — click to see why▾
Why this is wrong here
The commands 'show ip ospf neighbor' and 'show ip route ospf' are used for OSPFv2, not OSPFv3.
Why candidates choose this
Candidates may mistakenly use IPv4 OSPF commands out of habit, not realizing OSPFv3 has its own set of show commands.
✗Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route'.Wrong answer — click to see why▾
Why this is wrong here
'show ipv6 route' shows all routes, making it harder to verify OSPF specifically; the OSPF-specific command is 'show ipv6 route ospf'.
Why candidates choose this
Candidates may think 'show ipv6 route' is sufficient, but it does not filter for OSPF routes, which is important for verification.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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
OSPFv3 Single-Area Configuration for IPv6
Key term
Area 0
Area 0 is the backbone area in OSPF routing that connects all other OSPF areas to ensure a loop-free and efficient network routing topology.
Key term
OSPFv3
OSPFv3 is the version of the Open Shortest Path First routing protocol that supports IPv6 networks, enabling routers to exchange routing information for IPv6 addresses.
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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.