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300-410 Practice Question: An engineer must enable BFD for an OSPF…
An engineer must enable BFD for an OSPF single-hop session between two directly connected routers. Which TWO configuration changes are required on each router? (Choose TWO.)
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
✓
Configure the bfd interval command under the interface.
To enable BFD for OSPF, you must first enable BFD on the interface (bfd interval) and then enable BFD support under the OSPF routing process or interface (ip ospf bfd). The bfd neighbor command is for static BFD sessions, not OSPF. The router ospf command alone does not enable BFD. The bfd all-interfaces command enables BFD on all OSPF interfaces but still requires interface-level BFD configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure the bfd interval command under the interface.
Why this is correct
Correct. The bfd interval command enables BFD on the interface and sets the timers.
- ✓
Configure the ip ospf bfd command under the interface.
Why this is correct
Correct. This command enables BFD support for OSPF on that specific interface.
- ✗
Configure the bfd neighbor command under global configuration.
Why it's wrong here
Incorrect. The bfd neighbor command is used for static BFD sessions, not for dynamic protocols like OSPF.
- ✗
Configure the router ospf command and then use the bfd all-interfaces command.
Why it's wrong here
Incorrect. While bfd all-interfaces enables BFD on all OSPF interfaces, it still requires the interface-level bfd interval command to be present; this option alone is insufficient.
- ✗
Configure the bfd slow-timers command under the interface.
Why it's wrong here
Incorrect. The bfd slow-timers command is used for multihop BFD sessions and is not required for single-hop OSPF BFD.
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 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.