The answer is that the neighbor is the DR and the adjacency is fully established. This is confirmed by the output of the show ip ospf neighbor detail command, which explicitly lists the neighbor’s state as FULL and identifies the neighbor’s IP address (10.1.1.2) as the Designated Router (DR), while the local router (10.1.1.1) is the Backup DR (BDR). In OSPF, a FULL state indicates that the two routers have completed the database exchange process and are fully adjacent, which is required for DR and BDR relationships on multiaccess networks. On the Cisco CCNP ENARSI 300-410 exam, this command is frequently used to verify neighbor relationships and troubleshoot OSPF state issues; a common trap is confusing the DR and BDR roles when the neighbor’s priority is low, but here the DR is clearly the neighbor. A useful memory tip: if the neighbor’s IP matches the DR field and the state is FULL, you have a fully functional DR adjacency.
300-410 OSPF Troubleshooting (v2/v3) Practice Question
This 300-410 practice question tests your understanding of ospf troubleshooting (v2/v3). The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 to troubleshoot OSPF neighbor states:
R1# show ip ospf neighbor detail
Neighbor 2.2.2.2, interface address 10.1.1.2
In the area 0 via interface GigabitEthernet0/0
Neighbor priority is 1, State is FULL, 6 state changes
DR is 10.1.1.2, BDR is 10.1.1.1
Options is 0x42 (LLS, DC)
LLS Options is 0x1 (LR)
Dead timer due in 00:00:36
Neighbor is up for 00:12:34
Index 1/1/1
Retransmission queue length 0, number of retransmission 1
First 0x0(0)/0x0(0)/0x0(0) Next 0x0(0)/0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec
What does this output indicate?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The neighbor is the DR and the adjacency is fully established.
The output shows detailed OSPF neighbor information, including state, DR/BDR roles, and timers.
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.
✗
The neighbor is in the 2WAY state and not fully adjacent.
Why it's wrong here
The state is FULL, indicating a complete adjacency.
✓
The neighbor is the DR and the adjacency is fully established.
Why this is correct
The DR is 10.1.1.2 (neighbor's address) and state is FULL.
Clue confirmation
The clue word "first" in the question point toward this answer.
There is a retransmission queue issue causing packet loss.
Why it's wrong here
The retransmission queue length is 0, indicating no pending retransmissions.
✗
The neighbor is not participating in DR/BDR election.
Why it's wrong here
Neighbor priority is 1, so it participates; it is the DR.
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.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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) — 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: The neighbor is the DR and the adjacency is fully established. — The output shows detailed OSPF neighbor information, including state, DR/BDR roles, and timers.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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