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OSPF Troubleshooting (v2/v3) →mediumMultiple ChoiceObjective-mapped

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 interface GigabitEthernet0/0

GigabitEthernet0/0 is up, line protocol is up Internet Address 192.168.12.1/24, Area 0 Process ID 1, Router ID 10.1.1.1, Network Type BROADCAST, Cost: 10 Transmit Delay is 1 sec, State BDR, Priority 1 Designated Router (ID) 10.1.1.2, Interface address 192.168.12.2 Backup Designated router (ID) 10.1.1.1, Interface address 192.168.12.1 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:03

Neighbor Count is 1, Adjacent neighbor count is 1

Adjacent with neighbor 10.1.1.2 (Designated Router) Suppress hello for 0 neighbor(s)

Based on this output, which statement is correct?

Question 1mediummultiple choice

Review the full OSPF breakdown →

A
Router R1 is the Designated Router on this segment.
Why wrong: The state is BDR, not DR. The DR is 10.1.1.2.
B
Router R1 has a priority of 0, preventing it from becoming DR.
Why wrong: The priority is 1, which is the default and allows it to be BDR.
C
The dead timer is set to 40 seconds and is functioning correctly.
The dead interval is 40 seconds, and the hello timer is 10 seconds, which is standard. The adjacency is up, so timers are working.
D
Router R1 is not receiving hello packets from the DR.
Why wrong: The adjacency is with the DR, so hello packets are being received.

Full breakdown with real-world context →

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 dead timer is set to 40 seconds and is functioning correctly.

The interface is in state BDR, meaning Router R1 is the backup designated router. The DR is 10.1.1.2. The output shows one neighbor, which is the DR, and the adjacency is full.

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 Designated Router on this segment.
Why it's wrong here
The state is BDR, not DR. The DR is 10.1.1.2.
✗
Router R1 has a priority of 0, preventing it from becoming DR.
Why it's wrong here
The priority is 1, which is the default and allows it to be BDR.
✓
The dead timer is set to 40 seconds and is functioning correctly.
Why this is correct
The dead interval is 40 seconds, and the hello timer is 10 seconds, which is standard. The adjacency is up, so timers are working.
Related concept
OSPF neighbours must agree on key parameters.
✗
Router R1 is not receiving hello packets from the DR.
Why it's wrong here
The adjacency is with the DR, so hello packets are being received.

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.

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.

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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: The dead timer is set to 40 seconds and is functioning correctly. — The interface is in state BDR, meaning Router R1 is the backup designated router. The DR is 10.1.1.2. The output shows one neighbor, which is the DR, and the adjacency is full.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

OSPF neighbours must agree on key parameters.

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