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CCNP Practice Question: Issues the following command on Router R8: R8#…

A network engineer issues the following command on Router R8:

R8# show ip ospf neighbor detail

 Neighbor 1.1.1.1, interface address 192.168.1.1

In the area 0 via interface GigabitEthernet0/0

Neighbor priority is 1, State is FULL, 6 state changes

DR is 192.168.1.2, BDR is 192.168.1.1 Options is 0x42 (L LSR LSRR L LSR) Dead timer due in 00:00:34

Neighbor is up for 00:12:45

Index 1/1/1, retransmission queue length 0, number of retransmission 0 First 0x0(0)/0x0(0)/0x0(0) Next 0x0(0)/0x0(0)/0x0(0) Last retransmission scan length is 0, last retransmission scan time is 0 msec

Based on this output, what can be concluded?

⚠ Common exam trap

Cisco often tests the distinction between the neighbor's Router ID (1.1.1.1) and its interface address (192.168.1.1), causing candidates to confuse which router is the DR or BDR based on the Router ID rather than the explicit DR/BDR fields.

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

✓

Router 1.1.1.1 is the Backup Designated Router.

The output shows 'BDR is 192.168.1.1', which is the interface address of neighbor 1.1.1.1. This directly indicates that router 1.1.1.1 is the Backup Designated Router on this segment. The neighbor state is FULL, confirming adjacency is fully established.

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 1.1.1.1 is the Designated Router on this segment.

    Why it's wrong here

    In a broadcast multi-access network, the Designated Router is the router that forms full adjacencies with all other routers on the segment. The output identifies the DR as 192.168.1.2, whereas the neighbor with router ID 1.1.1.1 has the interface address 192.168.1.1. Therefore, asserting that 1.1.1.1 is the DR directly contradicts the DR field in the neighbor table, so this option is incorrect.

  • ✓

    Router 1.1.1.1 is the Backup Designated Router.

    Why this is correct

    The neighbor entry shows that 1.1.1.1 has an interface address of 192.168.1.1 and is in the FULL state. On the same line, the BDR field lists 192.168.1.1, which means this neighbor occupies the Backup Designated Router role for this multi-access segment. Because the BDR is the router that takes over if the DR fails, and the output explicitly assigns that address to this router, it is correct to conclude that 1.1.1.1 is the BDR.

  • ✗

    The neighbor state is 2WAY.

    Why it's wrong here

    The neighbor state in the output is FULL, not 2WAY. The 2WAY state merely confirms that two routers can communicate bidirectionally, but it is not a state where full adjacency exists. Since the neighbor is a BDR, OSPF establishes a full adjacency with it, meaning the state must be FULL, as shown; therefore the claim of 2WAY is unsupported by the output.

  • ✗

    The dead timer is 40 seconds.

    Why it's wrong here

    The output shows a dead timer of 34 seconds, which is the time remaining before the router considers the neighbor dead, not the configured OSPF dead interval. While the default dead interval on broadcast networks is often 40 seconds (four times the 10-second hello), the displayed value is the real-time countdown. Thus asserting that the dead timer is 40 seconds confuses the configured interval with the current remaining time, making the statement incorrect.

Visual reference

R1 R2 R3 R4 10 100 10 100 OSPF picks R1→R2→R4 (cost 20) over R1→R3→R4 (cost 200)

Quick reference

Routing Protocol Comparison

ProtocolMetricMax HopsAlgorithmType
RIP v2Hop count15Bellman-FordDistance vector
OSPFCost (bandwidth)UnlimitedDijkstra (SPF)Link state
EIGRPComposite metricUnlimitedDUALHybrid
IS-ISCostUnlimitedDijkstraLink state
BGPPolicy / attributesUnlimitedPath vectorPath vector

RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.