- A
Router R1 is the DR on the segment connected to GigabitEthernet0/0.
Why wrong: The neighbor state is DROTHER, meaning R1 is not the DR; the neighbor is DROTHER, so R1 might be DR or BDR, but the output only shows neighbor states, not R1's own role.
- B
Router R1 has a full adjacency with both neighbors and is in a stable state.
Both neighbors show FULL state, indicating complete adjacency. Dead times are decreasing normally, so adjacencies are stable.
- C
Router R1 is experiencing a neighbor timeout on GigabitEthernet0/1.
Why wrong: Dead time is 00:00:32, which is not near zero, so no timeout is imminent.
- D
Router R1 is not receiving hello packets from 10.1.1.2.
Why wrong: The neighbor state is FULL, so hello packets are being received; otherwise the state would be DOWN or INIT.
300-410 OSPF Troubleshooting (v2/v3) Practice Question
This 300-410 practice question tests your understanding of ospf troubleshooting (v2/v3). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command on Router R1:
R1# show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DROTHER 00:00:35 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 FULL/DR 00:00:32 192.168.13.3 GigabitEthernet0/1
Based on this output, which statement is correct?
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
Router R1 has a full adjacency with both neighbors and is in a stable state.
The output shows two OSPF neighbors. The neighbor with state FULL/DROTHER indicates it is not the DR or BDR on that segment. The neighbor with state FULL/DR is the designated router. The dead times are within normal range, indicating the adjacency is stable.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Router R1 is the DR on the segment connected to GigabitEthernet0/0.
Why it's wrong here
The neighbor state is DROTHER, meaning R1 is not the DR; the neighbor is DROTHER, so R1 might be DR or BDR, but the output only shows neighbor states, not R1's own role.
- ✓
Router R1 has a full adjacency with both neighbors and is in a stable state.
Why this is correct
Both neighbors show FULL state, indicating complete adjacency. Dead times are decreasing normally, so adjacencies are stable.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
Router R1 is experiencing a neighbor timeout on GigabitEthernet0/1.
Why it's wrong here
Dead time is 00:00:32, which is not near zero, so no timeout is imminent.
- ✗
Router R1 is not receiving hello packets from 10.1.1.2.
Why it's wrong here
The neighbor state is FULL, so hello packets are being received; otherwise the state would be DOWN or INIT.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
The neighbor state is DROTHER, meaning R1 is not the DR; the neighbor is DROTHER, so R1 might be DR or BDR, but the output only shows neighbor states, not R1's own role.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
- →
OSPF Troubleshooting (v2/v3) — study guide chapter
Learn the concepts, then practise the questions
- →
OSPF Troubleshooting (v2/v3) practice questions
Targeted practice on this topic area only
- →
All 300-410 questions
2,152 questions across all exam domains
- →
Cisco CCNP ENARSI 300-410 study guide
Full concept coverage aligned to exam objectives
- →
300-410 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 300-410 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Layer 3 Technologies practice questions
Practise 300-410 questions linked to Layer 3 Technologies.
EIGRP Troubleshooting practice questions
Practise 300-410 questions linked to EIGRP Troubleshooting.
OSPF Troubleshooting (v2/v3) practice questions
Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).
BGP Troubleshooting practice questions
Practise 300-410 questions linked to BGP Troubleshooting.
Route Redistribution practice questions
Practise 300-410 questions linked to Route Redistribution.
Policy-Based Routing (PBR) practice questions
Practise 300-410 questions linked to Policy-Based Routing (PBR).
VRF-Lite practice questions
Practise 300-410 questions linked to VRF-Lite.
Route Maps and Route Filtering practice questions
Practise 300-410 questions linked to Route Maps and Route Filtering.
Administrative Distance practice questions
Practise 300-410 questions linked to Administrative Distance.
Route Summarization practice questions
Practise 300-410 questions linked to Route Summarization.
Bidirectional Forwarding Detection (BFD) practice questions
Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).
VPN Technologies practice questions
Practise 300-410 questions linked to VPN Technologies.
Practice this exam
Start a free 300-410 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this 300-410 question test?
OSPF Troubleshooting (v2/v3) — This question tests OSPF Troubleshooting (v2/v3) — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Router R1 has a full adjacency with both neighbors and is in a stable state. — The output shows two OSPF neighbors. The neighbor with state FULL/DROTHER indicates it is not the DR or BDR on that segment. The neighbor with state FULL/DR is the designated router. The dead times are within normal range, indicating the adjacency is stable.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More 300-410 practice questions
- Drag and drop the steps to negotiate an IKEv2 IPsec site-to-site tunnel into the correct order, from first to last.
- Drag and drop the steps to troubleshoot an IPsec site-to-site VPN adjacency failure into the correct order, from first t…
- Drag and drop the steps to verify and validate the operational state of an IPsec site-to-site VPN into the correct order…
- Drag and drop the steps to configure a GRE tunnel for IPv6 over IPv4 into the correct order, from first to last.
- Drag and drop the steps to troubleshoot IPv6 over IPv4 tunnel adjacency or connectivity failures into the correct order,…
- Drag and drop the steps to verify and validate the operational state of an IPv6 tunneling technique into the correct ord…
Last reviewed: Jun 18, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.