mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot OSPF…
A network engineer runs the following command to troubleshoot OSPF over DMVPN:
R1# debug ip ospf adj
OSPF: 2 Way Communication to 10.0.0.2 on Tunnel0, state 2WAY OSPF: Send DBD to 10.0.0.2 on Tunnel0 seq 0x1234 opt 0x52 flag 0x7 OSPF: Rcv DBD from 10.0.0.2 on Tunnel0 seq 0x1235 opt 0x52 flag 0x2 OSPF: Exchange Done with 10.0.0.2 on Tunnel0 OSPF: Build router LSA for area 0, router ID 1.1.1.1
What does this output indicate?
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
✓
OSPF adjacency with 10.0.0.2 is forming successfully and will reach FULL state.
The debug shows OSPF adjacency formation: 2-way state, database description exchange, and exchange done, indicating a full adjacency is being established.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
OSPF adjacency with 10.0.0.2 is stuck in 2WAY state and not progressing.
Why it's wrong here
Incorrect because the output shows DBD exchange and exchange done.
- ✓
OSPF adjacency with 10.0.0.2 is forming successfully and will reach FULL state.
Why this is correct
Correct: The sequence shows normal adjacency formation steps.
- ✗
OSPF is not enabled on Tunnel0.
Why it's wrong here
Incorrect because OSPF packets are being sent and received.
- ✗
There is an OSPF MTU mismatch causing the adjacency to fail.
Why it's wrong here
Incorrect because there is no indication of MTU issues.
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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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.