mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot BFD…
A network engineer runs the following command to troubleshoot BFD with OSPF:
R1# show ip ospf interface gigabitethernet 0/0
GigabitEthernet0/0 is up, line protocol is up Internet Address 10.1.1.1/24, Area 0 Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1 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 Index 1/1/1, flood queue length 0 Next 0x0(0)/0x0(0)/0x0(0) Last flood scan length is 1, maximum is 25 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) BFD enabled, BFD interval 100 msec, BFD multiplier 3
What does this output indicate?
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
✓
OSPF is using BFD with a 100 ms interval and multiplier 3, enabling sub-second failure detection.
The output shows that BFD is enabled on the OSPF interface with an interval of 100 ms and multiplier of 3. This provides fast failure detection for OSPF adjacency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
OSPF is using BFD with a 100 ms interval and multiplier 3, enabling sub-second failure detection.
Why this is correct
BFD is enabled with the specified parameters, allowing OSPF to detect failures quickly.
- ✗
BFD is disabled on this OSPF interface.
Why it's wrong here
The output clearly states 'BFD enabled'.
- ✗
BFD interval is set to 10 seconds, matching OSPF hello.
Why it's wrong here
BFD interval is 100 ms, not 10 seconds.
- ✗
BFD session is down, causing OSPF to use dead timer.
Why it's wrong here
No indication of BFD session state; OSPF adjacency is established.
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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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.