The correct order is to first enter global configuration mode, then enable IPv6 routing with the `ipv6 unicast-routing` command, enter interface configuration mode, and finally apply `ipv6 ospf <process-id> area <area-id>` on the interface. This sequence is required because OSPFv3 operates independently from OSPFv2 and relies on IPv6 link-local addresses, so the router must be prepared to route IPv6 traffic before OSPF can establish neighbor relationships on an interface. On the CCNA 200-301 v2 exam, this drag-and-drop task tests your understanding that OSPFv3 configuration is interface-specific, not network-specific like OSPFv2, and a common trap is placing the OSPFv3 process configuration under the global OSPF router configuration mode instead of directly on the interface. Remember the mnemonic “GIRL” — Global config, IPv6 routing, interface, then Link-state on the interface — to lock in the correct order.
CCNA IP Routing Practice Question
This 200-301 practice question tests your understanding of ip routing. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Drag and drop the following commands into the correct order to configure OSPFv3 for IPv6 on a Cisco router.
This command enables IPv6 routing globally on the router, which is required before OSPFv3 can function.
B
ipv6 router ospf <process-id>
This command enters OSPFv3 router configuration mode, but it must be executed after enabling IPv6 routing globally.
C
interface <type> <number>
This command enters interface configuration mode, which is necessary for enabling OSPFv3 on an interface, but it must come after global OSPFv3 configuration.
D
ipv6 ospf <process-id> area <area-id>
This command enables OSPFv3 on an interface, but it must be executed after entering interface configuration mode and after the OSPFv3 process is configured globally.
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.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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
This command enables IPv6 routing globally on the router, which is required before OSPFv3 can function.
This command enters interface configuration mode, which is necessary for enabling OSPFv3 on an interface, but it must come after global OSPFv3 configuration.
This command enables OSPFv3 on an interface, but it must be executed after entering interface configuration mode and after the OSPFv3 process is configured globally.
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 200-301 OSPF questions on adjacency and route selection.
IP Routing — This question tests IP Routing — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: ipv6 unicast-routing — Commands must be executed in order: global config, IPv6 routing, interface config, OSPFv3 on interface, then verification.
What should I do if I get this 200-301 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 200-301 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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