mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip ospf neighbor 10.1.1.2 Neighbor 10.1.1.2, interface address 192.168.12.2
In the area 0 via interface GigabitEthernet0/0
Neighbor priority is 1, State is FULL, 6 state changes
DR is 10.1.1.2, BDR is 10.1.1.1 Options is 0x12 (L L S R) Dead timer due in 00:00:36
Neighbor is up for 00:15:42
Index 1/1/1, retransmission queue length 0, number of retransmission 0 First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0) Last retransmission scan length is 0, time is 0 msec Last retransmission scan time is 0 msec
Based on this output, what is the role of Router R1 on this segment?
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 R1 is the Backup Designated Router.
The output shows that the BDR is 10.1.1.1, which is Router R1's router ID. Therefore, R1 is the Backup Designated Router. The DR is 10.1.1.2.
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.
Why it's wrong here
The DR is listed as 10.1.1.2, not 10.1.1.1.
- ✓
Router R1 is the Backup Designated Router.
Why this is correct
The BDR is 10.1.1.1, which is R1's router ID.
- ✗
Router R1 is a DROTHER router.
Why it's wrong here
The state is FULL, and BDR is specified, so R1 is not a DROTHER.
- ✗
Router R1 has no special role on this segment.
Why it's wrong here
It is the BDR, which is a specific role.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Same concept, more angles
2 more ways this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command on Router R1: R1# show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DROTHER 00:00:35 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 FULL/DR 00:00:32 192.168.13.3 GigabitEthernet0/1 Based on this output, which statement is correct?
medium- A.Router R1 is the DR on the segment connected to GigabitEthernet0/0.
- ✓ B.Router R1 has a full adjacency with both neighbors and is in a stable state.
- C.Router R1 is experiencing a neighbor timeout on GigabitEthernet0/1.
- D.Router R1 is not receiving hello packets from 10.1.1.2.
Why B: The output shows two OSPF neighbors. The neighbor with state FULL/DROTHER indicates it is not the DR or BDR on that segment. The neighbor with state FULL/DR is the designated router. The dead times are within normal range, indicating the adjacency is stable.
Variation 2. 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?
medium- A.Router R1 is the Designated Router on this segment.
- B.Router R1 has a priority of 0, preventing it from becoming DR.
- ✓ C.The dead timer is set to 40 seconds and is functioning correctly.
- D.Router R1 is not receiving hello packets from the DR.
Why C: 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.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 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 300-410 exam.