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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 router.
⚠ Common exam trap
Remember that OSPFv3 requires a router ID to be explicitly configured (or derived from an IPv4 address) before enabling it on interfaces. The process must be created first, then the router ID, then interface enablement.
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
✓
1. Enter global configuration mode. 2. Create the OSPFv3 process and assign a process ID. 3. Configure a router ID. 4. Enter interface configuration mode. 5. Enable OSPFv3 on the interface.
After entering global config, create the OSPFv3 process, set a router ID, then enable OSPFv3 on the desired interfaces under interface configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
1. Enter global configuration mode. 2. Create the OSPFv3 process and assign a process ID. 3. Configure a router ID. 4. Enter interface configuration mode. 5. Enable OSPFv3 on the interface.
Why this is correct
This sequence correctly follows the standard OSPFv3 configuration process: first enter global config, then create the OSPFv3 process with a process ID, set a router ID (required for OSPFv3), then enter interface config and enable OSPFv3 on the interface.
- ✗
1. Enter global configuration mode. 2. Enter interface configuration mode. 3. Enable OSPFv3 on the interface. 4. Create the OSPFv3 process and assign a process ID. 5. Configure a router ID.
Why it's wrong here
This sequence attempts to enter interface configuration mode and enable OSPFv3 before the OSPFv3 process has been created. In Cisco IOS, the command 'ipv6 ospf 1 area 0' on an interface references an OSPFv3 process ID that does not yet exist, so the router cannot establish adjacencies or exchange routing information. Additionally, without a router ID configured, the OSPFv3 process would fail to initialize, making this order fundamentally invalid.
- ✗
1. Enter global configuration mode. 2. Create the OSPFv3 process and assign a process ID. 3. Enter interface configuration mode. 4. Enable OSPFv3 on the interface. 5. Configure a router ID.
Why it's wrong here
This sequence creates the OSPFv3 process and assigns a process ID, but then proceeds to enable OSPFv3 on an interface before configuring a router ID. OSPFv3 strictly requires a router ID—unlike OSPFv2, it cannot derive one automatically from an IPv4 interface address since the process runs over IPv6. If you enable OSPFv3 on an interface before setting a router ID, the process may reject the configuration or fail to form adjacencies because the router ID is essential for router identification in link-state advertisements and neighbor relationships.
- ✗
1. Enter global configuration mode. 2. Configure a router ID. 3. Enter interface configuration mode. 4. Enable OSPFv3 on the interface. 5. Create the OSPFv3 process and assign a process ID.
Why it's wrong here
This sequence attempts to configure a router ID immediately after entering global configuration mode, but the router ID is not a global configuration command. The 'router-id' command must be issued in OSPFv3 router configuration mode, which is only accessible after the OSPFv3 process has been created with 'ipv6 router ospf process-id'. Therefore, step 2 is invalid because there is no OSPFv3 process context to accept the router ID, and attempting to configure it at global config would generate a '% Invalid input detected' error.
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.
✓1. Enter global configuration mode. 2. Create the OSPFv3 process and assign a process ID. 3. Configure a router ID. 4. Enter interface configuration mode. 5. Enable OSPFv3 on the interface.Correct answer▾
Why this is correct
This sequence correctly follows the standard OSPFv3 configuration process: first enter global config, then create the OSPFv3 process with a process ID, set a router ID (required for OSPFv3), then enter interface config and enable OSPFv3 on the interface.
✗1. Enter global configuration mode. 2. Enter interface configuration mode. 3. Enable OSPFv3 on the interface. 4. Create the OSPFv3 process and assign a process ID. 5. Configure a router ID.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that OSPFv3 requires the process and router ID to be configured before enabling it on interfaces; otherwise, the interface command may be rejected or the process may not form adjacencies.
Why candidates choose this
Candidates might think that interface configuration can be done first, similar to other protocols, but OSPFv3 requires the process to exist first.
✗1. Enter global configuration mode. 2. Create the OSPFv3 process and assign a process ID. 3. Enter interface configuration mode. 4. Enable OSPFv3 on the interface. 5. Configure a router ID.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that the router ID is a mandatory configuration step that must be done before enabling OSPFv3 on interfaces; otherwise, the process may use an incorrect or default router ID.
Why candidates choose this
Candidates might think the router ID can be configured later, but OSPFv3 requires it early to avoid adjacency issues.
✗1. Enter global configuration mode. 2. Configure a router ID. 3. Enter interface configuration mode. 4. Enable OSPFv3 on the interface. 5. Create the OSPFv3 process and assign a process ID.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that the router ID is configured within the OSPFv3 process (router ospfv3 [process-id]), so the process must exist first.
Why candidates choose this
Candidates might think the router ID is a global parameter, but it is actually part of the OSPFv3 process configuration.
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?”
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
Router ID
The Router ID is a unique 32-bit identifier assigned to a router running the OSPF routing protocol, used to distinguish it from other routers in the network.
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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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.