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300-410 Practice Question: Which TWO commands would a network engineer use…
Which TWO commands would a network engineer use to verify OSPFv2 neighbor state and adjacency issues on a Cisco IOS router? (Choose TWO.)
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
✓
show ip ospf neighbor
The 'show ip ospf neighbor' command displays the state of all OSPF neighbors, while 'debug ip ospf adj' provides real-time adjacency events. 'show ip route ospf' shows routes, not neighbor states; 'show ip ospf interface' shows per-interface details but not neighbor states directly; 'show ip protocols' displays routing process info, not neighbor states.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show ip ospf neighbor
Why this is correct
This command lists all OSPF neighbors and their current state (e.g., FULL, 2WAY, INIT).
- ✓
debug ip ospf adj
Why this is correct
This debug shows adjacency state transitions and hello packet exchanges, critical for troubleshooting.
- ✗
show ip route ospf
Why it's wrong here
This shows OSPF-learned routes, not neighbor states or adjacency issues.
- ✗
show ip ospf interface
Why it's wrong here
This shows OSPF parameters per interface but does not directly display neighbor states.
- ✗
show ip protocols
Why it's wrong here
This shows routing protocol timers and filters, not neighbor adjacency details.
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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