mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Device Access Control issue:
R1# debug ip ospf adj
OSPF: 2 Way: DBD with 10.1.1.2 on GigabitEthernet0/0 OSPF: Send DBD to 10.1.1.2 seq 0x1C opt 0x52 flag 0x7 len 32 OSPF: Rcv DBD from 10.1.1.2 seq 0x1C opt 0x52 flag 0x2 len 132 mtu 1500 OSPF: Nbr 10.1.1.2 is FULL, state changed from LOADING to FULL
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misinterpretation of the '2 Way: DBD' message, leading candidates to think the neighbor is stuck in the 2-Way state, when in fact the debug output clearly shows the adjacency progressing to FULL.
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 OSPF neighbor adjacency is successfully established and is in the FULL state.
The debug output shows the OSPF neighbor transitioning from LOADING to FULL, which confirms that the adjacency has been fully established. The sequence of DBD exchanges (flag 0x7 for master, flag 0x2 for slave) and the final FULL state indicate successful database synchronization, including LSA exchange and acknowledgment.
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 OSPF neighbor adjacency is successfully established and is in the FULL state.
Why this is correct
The output shows the neighbor state changing to FULL after DBD exchange, indicating a complete adjacency.
- ✗
The OSPF neighbor is stuck in the 2-Way state due to a mismatched MTU.
Why it's wrong here
The MTU value of 1500 is consistent in both sent and received DBDs; the adjacency progresses to FULL, so MTU mismatch is not an issue.
- ✗
The OSPF neighbor is in the LOADING state and cannot reach FULL because of a missing network statement.
Why it's wrong here
The neighbor transitions from LOADING to FULL, indicating successful LSA exchange; there is no stuck state.
- ✗
The OSPF neighbor is in the EXSTART state and is negotiating the master/slave relationship.
Why it's wrong here
The output shows the neighbor already passed EXSTART and EXCHANGE; the final state is FULL, not EXSTART.
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.