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.
Network Topology
You are connected to R1. Configure OSPFv3 for IPv6 on R1 and R2 so that they can exchange IPv6 routes. R1's GigabitEthernet0/0 is connected to R2's GigabitEthernet0/0. R1 has a loopback0 with IPv6 address 2001:db8:1::1/32, and R2 has a loopback0 with IPv6 address 2001:db8:2::2/32. Ensure OSPFv3 is enabled on both routers, the link interfaces are in area 0, and R1 learns the loopback route from R2.
Configure 'ipv6 ospf 1 area 0' under GigabitEthernet0/0 and Loopback0 on both routers.
This is correct because OSPFv3 requires the 'ipv6 ospf <process-id> area <area-id>' command on each interface that should participate in OSPFv3. This enables the OSPFv3 process on the interface and advertises the connected subnet.
B
Configure 'ipv6 router ospf 1' and then 'network 2001:db8:2::2/32 area 0' under the OSPFv3 process.
Why wrong: This is incorrect because OSPFv3 does not use the 'network' command under the router process like OSPFv2. Instead, OSPFv3 uses interface-level configuration.
C
Configure 'ipv6 unicast-routing' and 'ipv6 ospf 1 area 0' under the global configuration.
Why wrong: This is incorrect because 'ipv6 unicast-routing' is a global command to enable IPv6 routing, but it does not enable OSPFv3 on interfaces. The 'ipv6 ospf area' command must be applied per interface.
D
Configure 'router ospf 1' and then 'ipv6 unicast-routing' under the OSPFv3 process.
Why wrong: This is incorrect because 'router ospf 1' is used for OSPFv2 (IPv4), not OSPFv3. OSPFv3 uses 'ipv6 router ospf 1' to enter the OSPFv3 router configuration mode.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure 'ipv6 ospf 1 area 0' under GigabitEthernet0/0 and Loopback0 on both routers.
The provided configuration enables OSPFv3 on the interfaces, which is necessary, but it does not set a router-id. OSPFv3 requires a router-id to form adjacencies. Without any IPv4 addresses configured, the router-id defaults to 0.0.0.0, preventing neighbor formation and route exchange. Therefore, a valid solution must also include a router-id command under the OSPFv3 process (e.g., 'ipv6 router ospf 1' followed by 'router-id X.X.X.X').
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.
✓
Configure 'ipv6 ospf 1 area 0' under GigabitEthernet0/0 and Loopback0 on both routers.
Why this is correct
This is correct because OSPFv3 requires the 'ipv6 ospf <process-id> area <area-id>' command on each interface that should participate in OSPFv3. This enables the OSPFv3 process on the interface and advertises the connected subnet.
Configure 'ipv6 router ospf 1' and then 'network 2001:db8:2::2/32 area 0' under the OSPFv3 process.
Why it's wrong here
This is incorrect because OSPFv3 does not use the 'network' command under the router process like OSPFv2. Instead, OSPFv3 uses interface-level configuration.
✗
Configure 'ipv6 unicast-routing' and 'ipv6 ospf 1 area 0' under the global configuration.
Why it's wrong here
This is incorrect because 'ipv6 unicast-routing' is a global command to enable IPv6 routing, but it does not enable OSPFv3 on interfaces. The 'ipv6 ospf area' command must be applied per interface.
✗
Configure 'router ospf 1' and then 'ipv6 unicast-routing' under the OSPFv3 process.
Why it's wrong here
This is incorrect because 'router ospf 1' is used for OSPFv2 (IPv4), not OSPFv3. OSPFv3 uses 'ipv6 router ospf 1' to enter the OSPFv3 router configuration mode.
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.
✓Configure 'ipv6 ospf 1 area 0' under GigabitEthernet0/0 and Loopback0 on both routers.Correct answer▾
Why this is correct
This is correct because OSPFv3 requires the 'ipv6 ospf <process-id> area <area-id>' command on each interface that should participate in OSPFv3. This enables the OSPFv3 process on the interface and advertises the connected subnet.
✗Configure 'ipv6 router ospf 1' and then 'network 2001:db8:2::2/32 area 0' under the OSPFv3 process.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that OSPFv3 uses interface-level commands ('ipv6 ospf area') rather than the network statement used in OSPFv2.
Why candidates choose this
Candidates pick this because they are familiar with OSPFv2 configuration and mistakenly apply the same method to OSPFv3.
✗Configure 'ipv6 unicast-routing' and 'ipv6 ospf 1 area 0' under the global configuration.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that OSPFv3 interface configuration is required on each interface, not just globally.
Why candidates choose this
Candidates pick this because they think enabling IPv6 routing globally is sufficient, or they confuse the global 'ipv6 ospf' command with interface configuration.
✗Configure 'router ospf 1' and then 'ipv6 unicast-routing' under the OSPFv3 process.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that 'router ospf' is for IPv4 OSPF; OSPFv3 requires 'ipv6 router ospf'.
Why candidates choose this
Candidates pick this because they confuse OSPFv2 and OSPFv3 router configuration commands.
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?”
Common exam traps
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.
Trap categories for this question
Command / output trap
This is incorrect because OSPFv3 does not use the 'network' command under the router process like OSPFv2. Instead, OSPFv3 uses interface-level configuration.
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: Configure 'ipv6 ospf 1 area 0' under GigabitEthernet0/0 and Loopback0 on both routers. — The provided configuration enables OSPFv3 on the interfaces, which is necessary, but it does not set a router-id. OSPFv3 requires a router-id to form adjacencies. Without any IPv4 addresses configured, the router-id defaults to 0.0.0.0, preventing neighbor formation and route exchange. Therefore, a valid solution must also include a router-id command under the OSPFv3 process (e.g., 'ipv6 router ospf 1' followed by 'router-id X.X.X.X').
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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Question Discussion
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