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CCNA IP Routing Practice Question
Drag and drop the following steps into the correct order to explicitly configure OSPFv3 for IPv6 on a Cisco IOS-XE router, assuming no OSPFv3 routing process exists beforehand.
⚠ Common exam trap
Cisco exams often test the order of configuration steps. A common trap is to think that OSPFv3 interface configuration comes before creating the OSPFv3 process, or that verification can be done early. Remember that global IPv6 routing must be enabled first, as OSPFv3 depends on it.
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 unicast routing globally [CORRECT]
To configure OSPFv3, first globally enable IPv6 unicast routing (A). Next, create the OSPFv3 routing process (C) so that it is defined before interfaces try to use it. Then, configure OSPFv3 on the relevant interfaces (B) to activate routing. Finally, verify the OSPFv3 adjacency (D) to confirm neighbors are formed. This sequence avoids automatic process creation and ensures all steps are explicitly controlled.
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 unicast routing globally [CORRECT]
Why this is correct
Enable IPv6 unicast routing globally is the foundational prerequisite for OSPFv3 because OSPFv3 is an IPv6 routing protocol and requires the router to forward IPv6 packets. The global command `ipv6 unicast-routing` enables IPv6 on the routing table and activates the IPv6 forwarding plane; without it, the OSPFv3 process can be created but cannot participate in routing or form adjacencies. This must be step one because both the OSPFv3 process and interface-level configuration depend on the router having IPv6 enabled.
- ✓
Configure OSPFv3 on the interface [CORRECT]
Why this is correct
Configure OSPFv3 on the interface – This step must come after creating the OSPFv3 process (C) because the interface configuration references the process ID. It should also come before verification (D) because adjacency cannot form without interface configuration.
- ✓
Create the OSPFv3 routing process [CORRECT]
Why this is correct
Create the OSPFv3 routing process is the second critical step and must occur before any interface-level OSPFv3 configuration. The command `ipv6 router ospf [process-id]` instantiates the OSPFv3 process in global configuration mode, and subsequent interface commands such as `ipv6 ospf [process-id] area [area-id]` reference that process ID; if the process does not exist, the router rejects the interface configuration. Unlike OSPFv2, OSPFv3 does not use network statements, so creating the process is the explicit and necessary precursor to assigning interfaces to OSPFv3 areas.
- ✓
Verify OSPFv3 adjacency [CORRECT]
Why this is correct
Verify OSPFv3 adjacency – This is the final step to confirm successful neighbor formation after all configuration is in place. Placing it before interface configuration (B) would be incorrect because no adjacency can exist without interfaces being configured.
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
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.
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.