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300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an OSPF adjacency issue:
R1# debug ip ospf adj *Mar 1 00:12:34.567: OSPF-1 ADJ RtrA: Interface GigabitEthernet0/0 going Up *Mar 1 00:12:34.568: OSPF-1 ADJ RtrA: 2 Way Communication to 10.1.1.2 on GigabitEthernet0/0, state 2WAY *Mar 1 00:12:34.570: OSPF-1 ADJ RtrA: NBR 10.1.1.2: Our router ID 1.1.1.1, his router ID 2.2.2.2 *Mar 1 00:12:34.571: OSPF-1 ADJ RtrA: NBR 10.1.1.2: Neighbor is not DR, state 2WAY *Mar 1 00:12:34.572: OSPF-1 ADJ RtrA: NBR 10.1.1.2: DR is 10.1.1.2, BDR is 10.1.1.1 *Mar 1 00:12:34.573: OSPF-1 ADJ RtrA: NBR 10.1.1.2: Build the Start DBD *Mar 1 00:12:34.574: OSPF-1 ADJ RtrA: NBR 10.1.1.2: Master/Slave negotiation done *Mar 1 00:12:34.576: OSPF-1 ADJ RtrA: NBR 10.1.1.2: Exchange done, loading started *Mar 1 00:12:34.578: OSPF-1 ADJ RtrA: NBR 10.1.1.2: Loading done *Mar 1 00:12:34.580: OSPF-1 ADJ RtrA: NBR 10.1.1.2: Full
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
✓
The adjacency formed successfully, and the neighbor is in Full state.
The debug output shows the complete OSPF adjacency formation process from Down to Full state, indicating a successful adjacency.
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 adjacency failed due to a mismatch in the DR election.
Why it's wrong here
The debug shows successful DR/BDR election and adjacency reaching Full state.
- ✓
The adjacency formed successfully, and the neighbor is in Full state.
Why this is correct
The sequence of messages shows all OSPF adjacency steps completing, ending with 'Full'.
- ✗
The adjacency is stuck in Exstart state due to MTU mismatch.
Why it's wrong here
The debug shows Master/Slave negotiation done and Exchange done, so no MTU issue.
- ✗
The neighbor is not the DR, so the adjacency will not form.
Why it's wrong here
OSPF adjacencies form regardless of DR/BDR status; the debug shows Full state.
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.