Question 870 of 2,152

Administrative Distance →easyMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is that the interface is an OSPF broadcast interface with a cost of 1, and the router is the Designated Router. This is confirmed by the `show ip ospf interface detail` output, which explicitly lists the network type as BROADCAST, the cost as 1, and the state as DR (Designated Router) with a priority of 1. The output also reveals the router ID 1.1.1.1 and the adjacent neighbor 2.2.2.2 as the Backup Designated Router, indicating a fully functional multi-access OSPF segment. On the Cisco CCNP ENARSI 300-410 exam, this command is a critical troubleshooting tool for verifying OSPF interface configuration details, especially when diagnosing adjacency issues or unexpected routing behavior. A common trap is confusing the DR election with priority values—remember that a priority of 1 does not guarantee DR status unless all other routers have a lower priority or are non-DR capable. For a quick memory tip: "DR is not about priority alone; it’s about the highest Router ID when priorities tie."

300-410 Administrative Distance Practice Question

This 300-410 practice question tests your understanding of administrative distance. 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 an Administrative Distance issue:

R1# show ip ospf interface detail GigabitEthernet0/0

GigabitEthernet0/0 is up, line protocol is up Internet Address 10.1.1.1/24, Area 0, Attached via Network Statement Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 Topology-MTID Cost Disabled Shutdown Topology Name 0 1 no no Base 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 Can be protected by per-prefix Loop-Free Fast Reroute Can be used for per-prefix Loop-Free Fast Reroute remote-LFA tunnels Index 1/1/1, flood queue length 0 Next 0x0(0)/0x0(0)/0x0(0) Last flood scan length is 1, maximum is 1 Last flood scan time is 0 msec, maximum is 0 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)

What does this output indicate?

Question 1easymultiple choice

Review the full OSPF breakdown →

A
The interface is an OSPF broadcast interface with a cost of 1, and the router is the Designated Router.
The output clearly states State DR, indicating this router is the Designated Router on this segment.
B
The interface has an administrative distance of 110.
Why wrong: Administrative distance is not shown in this output; it is a per-protocol value.
C
The neighbor 2.2.2.2 is not fully adjacent because it is a backup designated router.
Why wrong: The neighbor is listed as Adjacent, meaning full adjacency.
D
The OSPF process ID is 100.
Why wrong: The process ID is 1, not 100.

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 interface is an OSPF broadcast interface with a cost of 1, and the router is the Designated Router.

The output shows detailed OSPF interface information, including the cost, timers, and neighbor state. It does not directly show administrative distance, but it is relevant for understanding OSPF operation.

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 interface is an OSPF broadcast interface with a cost of 1, and the router is the Designated Router.
Why this is correct
The output clearly states State DR, indicating this router is the Designated Router on this segment.
Related concept
OSPF neighbours must agree on key parameters.
✗
The interface has an administrative distance of 110.
Why it's wrong here
Administrative distance is not shown in this output; it is a per-protocol value.
✗
The neighbor 2.2.2.2 is not fully adjacent because it is a backup designated router.
Why it's wrong here
The neighbor is listed as Adjacent, meaning full adjacency.
✗
The OSPF process ID is 100.
Why it's wrong here
The process ID is 1, not 100.

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
Administrative distance is not shown in this output; it is a per-protocol value.

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?

Administrative Distance — This question tests Administrative Distance — OSPF neighbours must agree on key parameters..

What is the correct answer to this question?

The correct answer is: The interface is an OSPF broadcast interface with a cost of 1, and the router is the Designated Router. — The output shows detailed OSPF interface information, including the cost, timers, and neighbor state. It does not directly show administrative distance, but it is relevant for understanding OSPF operation.

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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Last reviewed: Jun 18, 2026

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