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CCNA IP Routing Practice Question
Drag and drop the following commands into the correct order to configure OSPFv3 for IPv6 on a Cisco router.
⚠ Common exam trap
The most common trap is starting with the OSPFv3 router configuration command without first enabling IPv6 routing globally. Also, candidates may try to apply the interface-level OSPFv3 command before entering interface configuration mode.
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 unicast-routing
Commands must be executed in order: global config, IPv6 routing, interface config, OSPFv3 on interface, then verification.
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 unicast-routing
Why this is correct
The `ipv6 unicast-routing` command globally enables the router's IPv6 forwarding plane, which is mandatory before OSPFv3 can exchange any IPv6 routes. Without this command, the router will not process IPv6 packets, so OSPFv3 adjacencies cannot form. It must be the first command in the configuration sequence because it creates the fundamental IPv6 routing environment that all subsequent OSPFv3 configuration relies upon.
- ✓
ipv6 router ospf <process-id>
Why this is correct
The `ipv6 router ospf <process-id>` command creates an OSPFv3 routing process and enters router configuration mode, where you can set global parameters such as router ID, timers, and reference bandwidth. This step must be executed after enabling IPv6 routing, but it does not yet advertise any interfaces; it merely establishes the OSPFv3 process that later interface-level commands will reference by the given process ID.
- ✓
interface <type> <number>
Why this is correct
The `interface <type> <number>` command is used to enter interface configuration mode for a specific port, such as GigabitEthernet0/0. This is a necessary intermediate step because OSPFv3 is enabled on a per-interface basis, unlike OSPFv2's network statements, so you must select the exact interface context before applying any OSPFv3 parameters to it.
- ✓
ipv6 ospf <process-id> area <area-id>
Why this is correct
The `ipv6 ospf <process-id> area <area-id>` command, when executed from interface configuration mode, attaches that interface to the specified OSPFv3 process and assigns it to an OSPF area. This is the final activation step that causes the interface to start sending OSPFv3 hello packets, and it depends on both the OSPFv3 process having been created globally and the interface configuration mode being active.
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
IPv6
IPv6 is the most recent version of the Internet Protocol, designed to replace IPv4 by providing a vastly larger number of unique addresses and improved network features.
Key term
OSPF
OSPF is a link-state routing protocol that uses the SPF algorithm to compute the shortest path to each destination within a single autonomous system.
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Same concept, more angles
1 more way this is tested on 200-301
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the following commands into the correct order to configure OSPFv3 for IPv6 on a Cisco IOS-XE router.
medium- ✓ A.ipv6 unicast-routing
- ✓ B.router ospfv3 1
- ✓ C.interface GigabitEthernet0/0
- ✓ D.ipv6 ospf 1 area 0
Why A: The correct sequence for configuring OSPFv3 on a Cisco IOS-XE router is: first enable IPv6 routing globally with `ipv6 unicast-routing` (A), then create the OSPFv3 process with `router ospfv3 1` (B), then enter interface configuration mode for the desired interface with `interface GigabitEthernet0/0` (C), and finally enable OSPFv3 on that interface using `ipv6 ospf 1 area 0` (D). This order ensures IPv6 is enabled before configuring OSPFv3, the OSPFv3 process exists before it is assigned to an interface, and the interface is selected before applying the OSPFv3 configuration.
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.