CCNA IP Routing Practice Question
Network Topology
You are connected to R1, a router that must establish OSPFv3 adjacency with R2 over the directly connected link G0/0. The current configuration is incomplete: OSPFv3 process is configured but not enabled on the interface, and global IPv6 unicast routing is missing. Configure R1 so that it becomes an OSPFv3 neighbor with R2 and learns the loopback route 2001:db8:1:2::/64 via OSPFv3. Then verify neighbor state and routing table.
⚠ Common exam trap
The exam trap is that OSPFv3 configuration differs from OSPFv2: OSPFv3 does not use network statements under the router process; instead, it is enabled directly on the interface. Additionally, IPv6 unicast routing must be globally enabled before OSPFv3 can function. Candidates often forget one of these two steps.
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 and activate OSPFv3 on GigabitEthernet0/0 with the command 'ipv6 ospf 1 area 0'.
R1 is missing two critical configurations: global IPv6 unicast routing must be enabled with 'ipv6 unicast-routing', and OSPFv3 must be activated on GigabitEthernet0/0 using 'ipv6 ospf 1 area 0' under the interface. Without these, R1 cannot send or receive OSPFv3 hellos, so no adjacency forms and routes are not exchanged. After applying both commands, the neighbor state becomes FULL and the remote loopback appears in the IPv6 routing table.
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 and activate OSPFv3 on GigabitEthernet0/0 with the command 'ipv6 ospf 1 area 0'.
Why this is correct
This is correct because 'ipv6 unicast-routing' enables IPv6 forwarding on the router, which is required for OSPFv3 to operate. The 'ipv6 ospf 1 area 0' command under the interface activates OSPFv3 process 1 in area 0 on that link, allowing R1 to send and receive OSPFv3 hello packets and form an adjacency with R2.
- ✗
Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'network' command under the OSPFv3 router configuration mode.
Why it's wrong here
This is incorrect because OSPFv3 does not use the 'network' command under the router configuration mode to enable OSPF on interfaces. Unlike OSPFv2, OSPFv3 is enabled directly on the interface using the 'ipv6 ospf' command.
- ✗
Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'router-id' command to ensure adjacency.
Why it's wrong here
This is incorrect because while a router ID is necessary for OSPFv3, the primary missing configuration is enabling OSPFv3 on the interface. Without the 'ipv6 ospf' command on the interface, no hellos are sent and no adjacency forms, regardless of the router ID.
- ✗
Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'passive-interface default' command to allow adjacency.
Why it's wrong here
This is incorrect because the 'passive-interface default' command suppresses OSPF hello packets on all interfaces, preventing adjacency formation. To form an adjacency, the interface must not be passive, and OSPFv3 must be explicitly enabled on it.
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 unicast routing globally and activate OSPFv3 on GigabitEthernet0/0 with the command 'ipv6 ospf 1 area 0'.Correct answer▾
Why this is correct
This is correct because 'ipv6 unicast-routing' enables IPv6 forwarding on the router, which is required for OSPFv3 to operate. The 'ipv6 ospf 1 area 0' command under the interface activates OSPFv3 process 1 in area 0 on that link, allowing R1 to send and receive OSPFv3 hello packets and form an adjacency with R2.
✗Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'network' command under the OSPFv3 router configuration mode.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that OSPFv3 uses interface-level configuration, not network statements under the OSPF process.
Why candidates choose this
Candidates familiar with OSPFv2 might mistakenly apply the same 'network' command logic to OSPFv3, not realizing the difference in configuration method.
✗Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'router-id' command to ensure adjacency.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that setting a router ID alone does not activate OSPFv3 on an interface; OSPFv3 must be explicitly enabled on the interface.
Why candidates choose this
Candidates may think that configuring a router ID is the key missing step, especially if they see OSPFv3 process running but no neighbor forming, but they overlook the interface activation.
✗Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'passive-interface default' command to allow adjacency.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that 'passive-interface default' would actually prevent adjacency, not help form it.
Why candidates choose this
Candidates might confuse 'passive-interface' with enabling OSPF on an interface, or think that making an interface passive is necessary for OSPF to work, but the opposite is true for adjacency formation.
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
Routing table
A routing table is a data set stored in a router or host that contains information about network paths and is used to determine where to forward data packets.
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.