This 200-301 practice question tests your understanding of ip routing. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 so that R1 and R2 can exchange IPv6 routes over their directly connected link. Enable IPv6 routing, assign OSPFv3 process and area on the interface, and verify that the neighbor adjacency forms and routes appear in the IPv6 routing table.
R1# show running-config | section interface GigabitEthernet0/0
interface GigabitEthernet0/0
ip address 192.0.2.1 255.255.255.252
duplex auto
speed auto
media-type rj45
no shutdown
!
R1# show ipv6 interface brief
GigabitEthernet0/0 [up/up]
FE80::1
2001:DB8:1::1/64
Loopback0 [up/up]
FE80::1
2001:DB8:2::1/64
R1# show running-config | include ipv6 unicast-routing
no ipv6 unicast-routing
A
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route ospf'.
This is correct because 'ipv6 unicast-routing' enables IPv6 forwarding, and 'ipv6 ospf 1 area 0' activates OSPFv3 on the interface. The verification commands confirm neighbor adjacency and OSPF-learned routes.
B
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 globally with 'router ospfv3 1' and 'router-id 1.1.1.1', then assign the interface to area 0 with 'ipv6 ospf 1 area 0'.
Why wrong: This is incorrect because OSPFv3 does not require a global router configuration or router-id to form an adjacency; it can be configured directly on the interface. The router-id is optional and not needed for basic operation.
C
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ip ospf neighbor' and 'show ip route ospf'.
Why wrong: This is incorrect because the verification commands are for OSPFv2 (IPv4), not OSPFv3 (IPv6). The correct commands are 'show ospfv3 neighbor' and 'show ipv6 route ospf'.
D
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route'.
Why wrong: This is incorrect because 'show ipv6 route' displays all IPv6 routes, not just OSPF-learned ones. To specifically see OSPF routes, use 'show ipv6 route ospf'.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route ospf'.
Option A is correct because it includes enabling IPv6 routing with 'ipv6 unicast-routing', applying OSPFv3 to the interface using 'ipv6 ospf 1 area 0', and verifying with the correct OSPFv3-specific commands 'show ospfv3 neighbor' and 'show ipv6 route ospf'. Option B is incorrect because it adds a global 'router ospfv3 1' command, which is unnecessary; OSPFv3 can be configured directly on the interface without a global process. Option C is incorrect because it uses IPv4 OSPF verification commands 'show ip ospf neighbor' and 'show ip route ospf', which are not valid for OSPFv3. Option D is incorrect because although it uses the correct 'show ospfv3 neighbor', the 'show ipv6 route' command does not filter to OSPF-learned routes, so it displays all IPv6 routes rather than just OSPF routes.
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.
✓
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route ospf'.
Why this is correct
This is correct because 'ipv6 unicast-routing' enables IPv6 forwarding, and 'ipv6 ospf 1 area 0' activates OSPFv3 on the interface. The verification commands confirm neighbor adjacency and OSPF-learned routes.
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 globally with 'router ospfv3 1' and 'router-id 1.1.1.1', then assign the interface to area 0 with 'ipv6 ospf 1 area 0'.
Why it's wrong here
This is incorrect because OSPFv3 does not require a global router configuration or router-id to form an adjacency; it can be configured directly on the interface. The router-id is optional and not needed for basic operation.
✗
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ip ospf neighbor' and 'show ip route ospf'.
Why it's wrong here
This is incorrect because the verification commands are for OSPFv2 (IPv4), not OSPFv3 (IPv6). The correct commands are 'show ospfv3 neighbor' and 'show ipv6 route ospf'.
✗
Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route'.
Why it's wrong here
This is incorrect because 'show ipv6 route' displays all IPv6 routes, not just OSPF-learned ones. To specifically see OSPF routes, use 'show ipv6 route ospf'.
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 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route ospf'.Correct answer▾
Why this is correct
This is correct because 'ipv6 unicast-routing' enables IPv6 forwarding, and 'ipv6 ospf 1 area 0' activates OSPFv3 on the interface. The verification commands confirm neighbor adjacency and OSPF-learned routes.
✗Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 globally with 'router ospfv3 1' and 'router-id 1.1.1.1', then assign the interface to area 0 with 'ipv6 ospf 1 area 0'.Wrong answer — click to see why▾
Why this is wrong here
OSPFv3 can be configured entirely on the interface without a global router process; the router-id is not mandatory.
Why candidates choose this
Candidates may confuse OSPFv3 with OSPFv2, which requires a router process and router-id.
✗Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ip ospf neighbor' and 'show ip route ospf'.Wrong answer — click to see why▾
Why this is wrong here
The commands 'show ip ospf neighbor' and 'show ip route ospf' are used for OSPFv2, not OSPFv3.
Why candidates choose this
Candidates may mistakenly use IPv4 OSPF commands out of habit, not realizing OSPFv3 has its own set of show commands.
✗Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route'.Wrong answer — click to see why▾
Why this is wrong here
'show ipv6 route' shows all routes, making it harder to verify OSPF specifically; the OSPF-specific command is 'show ipv6 route ospf'.
Why candidates choose this
Candidates may think 'show ipv6 route' is sufficient, but it does not filter for OSPF routes, which is important for verification.
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 the verification commands are for OSPFv2 (IPv4), not OSPFv3 (IPv6). The correct commands are 'show ospfv3 neighbor' and 'show ipv6 route ospf'.
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: Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route ospf'. — Option A is correct because it includes enabling IPv6 routing with 'ipv6 unicast-routing', applying OSPFv3 to the interface using 'ipv6 ospf 1 area 0', and verifying with the correct OSPFv3-specific commands 'show ospfv3 neighbor' and 'show ipv6 route ospf'. Option B is incorrect because it adds a global 'router ospfv3 1' command, which is unnecessary; OSPFv3 can be configured directly on the interface without a global process. Option C is incorrect because it uses IPv4 OSPF verification commands 'show ip ospf neighbor' and 'show ip route ospf', which are not valid for OSPFv3. Option D is incorrect because although it uses the correct 'show ospfv3 neighbor', the 'show ipv6 route' command does not filter to OSPF-learned routes, so it displays all IPv6 routes rather than just OSPF routes.
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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