- A
The router is the DR, which is normal, but the neighbor count of 1 indicates only one OSPF neighbor is present.
Why wrong: This is a normal state; no problem is indicated.
- B
The interface is in area 0, but redistribution of external routes requires a route-map to set the metric.
Why wrong: Redistribution does not require a route-map; it can be done with default metrics.
- C
The output shows no external routes are being redistributed, but this is a normal interface status.
The interface output is normal; redistribution status is not shown here. The candidate must understand that this command does not show redistribution information.
- D
The router ID is 1.1.1.1, which is not reachable from other routers.
Why wrong: The router ID is an IP address used for OSPF, but reachability is not an issue here.
Quick Answer
The answer is that there is no problem; the show ip ospf interface output for DR normal operation confirms Router R1 is functioning correctly as the Designated Router on a broadcast network. This is because the output shows R1 with State DR, a single adjacent neighbor (2.2.2.2 as the Backup Designated Router), and standard Hello/Dead timers of 10 and 40 seconds—all expected for a healthy OSPF interface on a multiaccess segment. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to distinguish between a normal OSPF interface state and actual misconfigurations; a common trap is assuming a single neighbor indicates a problem, when in fact a DR on a point-to-multipoint or broadcast network can have just one neighbor and still be fully operational. Remember the key memory tip: “DR with one neighbor is fine—check the network type and adjacency count, not the number of neighbors.”
300-410 Route Redistribution Practice Question
This 300-410 practice question tests your understanding of route redistribution. 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 on Router R1:
R1# show ip ospf interface GigabitEthernet0/1
GigabitEthernet0/1 is up, line protocol is up Internet Address 10.1.1.1/24, Area 0 Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DR, Priority 1 Designated Router (ID) 1.1.1.1, Interface address 10.1.1.1 Backup Designated router (ID) 2.2.2.2, Interface address 10.1.1.2 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:03 Supports Link-local Signaling (LLS) Cisco NSF helper support enabled IETF NSF helper support enabled Index 1/1, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 1, maximum is 25 Last flood scan time is 0 msec, maximum is 4 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 2.2.2.2 (Backup Designated Router) Suppress hello for 0 neighbor(s)
Based on this output, what is the problem?
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 output shows no external routes are being redistributed, but this is a normal interface status.
The output shows R1 is the Designated Router (DR) on a broadcast network. The neighbor count is 1, which is normal. However, the problem might be that redistribution is not happening because the interface is in area 0, but no external routes are seen. The output itself does not show a direct problem; it is a normal OSPF interface state. The question likely expects the candidate to note that the interface is functioning correctly, but the context of redistribution might imply that redistribution is configured but not working due to other issues.
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 router is the DR, which is normal, but the neighbor count of 1 indicates only one OSPF neighbor is present.
Why it's wrong here
This is a normal state; no problem is indicated.
- ✗
The interface is in area 0, but redistribution of external routes requires a route-map to set the metric.
Why it's wrong here
Redistribution does not require a route-map; it can be done with default metrics.
- ✓
The output shows no external routes are being redistributed, but this is a normal interface status.
Why this is correct
The interface output is normal; redistribution status is not shown here. The candidate must understand that this command does not show redistribution information.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The router ID is 1.1.1.1, which is not reachable from other routers.
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?
Route Redistribution — This question tests Route Redistribution — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The output shows no external routes are being redistributed, but this is a normal interface status. — The output shows R1 is the Designated Router (DR) on a broadcast network. The neighbor count is 1, which is normal. However, the problem might be that redistribution is not happening because the interface is in area 0, but no external routes are seen. The output itself does not show a direct problem; it is a normal OSPF interface state. The question likely expects the candidate to note that the interface is functioning correctly, but the context of redistribution might imply that redistribution is configured but not working due to other issues.
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.
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Last reviewed: Jun 18, 2026
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