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CCNP OSPF Practice Question

This 350-401 practice question tests your understanding of ospf. 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 issues the following command on Router R2:

R2# show ip ospf interface GigabitEthernet0/0

GigabitEthernet0/0 is up, line protocol is up Internet Address 192.168.1.2/24, Area 0 Process ID 1, Router ID 2.2.2.2, Network Type BROADCAST, Cost: 10 Transmit Delay is 1 sec, State DR, Priority 1 Designated Router (ID) 2.2.2.2, Interface address 192.168.1.2 Backup Designated router (ID) 1.1.1.1, Interface address 192.168.1.1 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:03 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 2, Adjacent neighbor count is 2

Adjacent with neighbor 1.1.1.1 (Backup Designated Router) Adjacent with neighbor 3.3.3.3

Based on this output, what can be concluded?

Question 1hardmultiple choice
Review the full OSPF breakdown →

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

✓

R2 has a full OSPF adjacency with all neighbors on this segment.

The output shows that R2 is the Designated Router (DR) on this broadcast segment, with two neighbors listed: 1.1.1.1 (BDR) and 3.3.3.3. The 'Adjacent neighbor count is 2' and both neighbors are listed as 'Adjacent with neighbor', confirming that R2 has formed full OSPF adjacencies with all neighbors on this segment. In OSPF broadcast networks, only the DR and BDR form full adjacencies with all routers, while non-DR/BDR routers only form full adjacencies with the DR and BDR.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✓

    R2 has a full OSPF adjacency with all neighbors on this segment.

    Why this is correct

    The adjacent neighbor count is 2, equal to the neighbor count, meaning all neighbors are fully adjacent.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    R2 is the Backup Designated Router on this segment.

    Why it's wrong here

    The state is DR, not BDR.

  • ✗

    The OSPF cost to reach the network 192.168.1.0/24 is 20.

    Why it's wrong here

    The cost on this interface is 10, not 20.

  • ✗

    R2 will send hello packets every 40 seconds.

    Why it's wrong here

    The hello interval is 10 seconds, not 40.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the distinction between 'neighbor count' and 'adjacent neighbor count' — candidates may incorrectly assume that all neighbors are fully adjacent, but in broadcast networks, only the DR and BDR have full adjacencies with all routers, while other routers only have full adjacency with the DR and BDR.

Detailed technical explanation

How to think about this question

In OSPF broadcast multiaccess networks, the DR and BDR are elected based on highest priority (default 1) and then highest Router ID; the DR forms full adjacencies with all other routers on the segment, while non-DR routers only exchange LSAs with the DR and BDR to reduce flooding overhead. The 'Adjacent neighbor count is 2' indicates that R2 has established full adjacency with both the BDR and the other neighbor (3.3.3.3), which is expected for a DR. In real-world deployments, misconfigured priorities or Router IDs can lead to suboptimal DR election, affecting convergence and link-state database synchronization.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 350-401 question test?

OSPF — This question tests OSPF — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: R2 has a full OSPF adjacency with all neighbors on this segment. — The output shows that R2 is the Designated Router (DR) on this broadcast segment, with two neighbors listed: 1.1.1.1 (BDR) and 3.3.3.3. The 'Adjacent neighbor count is 2' and both neighbors are listed as 'Adjacent with neighbor', confirming that R2 has formed full OSPF adjacencies with all neighbors on this segment. In OSPF broadcast networks, only the DR and BDR form full adjacencies with all routers, while non-DR/BDR routers only form full adjacencies with the DR and BDR.

What should I do if I get this 350-401 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 24, 2026

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