mediumMultiple Choice
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 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?
⚠ Common exam trap
300-410 often tests reading OSPF interface output carefully — candidates see 'Designated Router (ID) 10.1.1.2' and assume R1 is the DR, missing the 'State BDR' line and the 'Backup Designated router (ID) 10.1.1.1' line that identifies R1 as BDR.
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 dead timer is set to 40 seconds and is functioning correctly.
The output shows 'Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5', confirming the dead timer is 40 seconds (4× the hello interval), which is the default and functioning correctly. R1 is BDR (Backup Designated Router), not DR, and its priority is 1, not 0.
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 on this segment.
Why it's wrong here
R1's State field reads BDR, and the Designated Router is 10.1.1.2, so R1 is the backup, not the DR. The option is tempting because R1 does appear as Backup Designated router with its own interface address. It would be correct only if the State line read DR.
- ✗
Router R1 has a priority of 0, preventing it from becoming DR.
Why it's wrong here
The output lists Priority 1, not 0, so R1 remains eligible to become DR. Priority 0 is tempting because it genuinely disqualifies a router from DR/BDR election, and it is configured when a device should never hold either role. Here the stated value simply contradicts the output.
- ✓
The dead timer is set to 40 seconds and is functioning correctly.
Why this is correct
The Dead interval of 40 seconds matches four times the Hello interval of 10 seconds, the default ratio for broadcast networks, so the timer is operating as expected. The stem's BROADCAST network type confirms these defaults apply, and the adjacency with the DR shows the timer is not expiring prematurely.
- ✗
Router R1 is not receiving hello packets from the DR.
Why it's wrong here
R1 shows an adjacency with the DR (10.1.1.2) and a Hello due in three seconds, confirming hellos are being exchanged. The option is tempting because a dead timer or mismatched hello interval would genuinely break adjacency. Neither condition appears in this output.
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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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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