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300-410 Practice Question: Which THREE symptoms indicate a potential OSPFv2…
Which THREE symptoms indicate a potential OSPFv2 neighbor adjacency problem due to a mismatch in configuration? (Choose THREE.)
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
✓
The neighbor state remains stuck in INIT or EXSTART.
A mismatch in hello/dead timers, area ID, or authentication causes neighbors to stay stuck in INIT or EXSTART state. A mismatched MTU can cause stuck in EXSTART/EXCHANGE. A mismatched network type can also cause issues. Routes missing from the routing table is a symptom of many issues, not specific to mismatches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The neighbor state remains stuck in INIT or EXSTART.
Why this is correct
Mismatched parameters (e.g., timers, area ID) often prevent full adjacency, leaving the state in INIT or EXSTART.
- ✗
The neighbor state is 2WAY/DROTHER.
Why it's wrong here
2WAY/DROTHER is normal for non-DR/BDR routers on broadcast networks.
- ✗
The 'show ip ospf neighbor' output shows the neighbor but with a state of DOWN.
Why it's wrong here
A neighbor in DOWN state is not listed in 'show ip ospf neighbor' output.
- ✓
The 'show ip ospf neighbor' output shows the neighbor but with a state of EXSTART/EXCHANGE.
Why this is correct
Stuck in EXSTART/EXCHANGE often indicates MTU mismatch or DD packet issues.
- ✓
The OSPF routes are missing from the routing table.
Why this is correct
If adjacency is not FULL, routes are not exchanged, leading to missing OSPF routes.
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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