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300-410 Practice Question: Which TWO configuration steps are required to…
Which TWO configuration steps are required to enable BFD for OSPF on a Cisco IOS-XE 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 'bfd' under the interface
To enable BFD for OSPF, you must first enable BFD on the interface using the 'bfd' interface command, and then enable BFD support for OSPF under the OSPF routing process with 'bfd all-interfaces' or per-neighbor. The other options are either incorrect or not required.
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 'bfd' under the interface
Why this is correct
This enables BFD on the interface, allowing BFD sessions to be established.
- ✓
Configure 'bfd all-interfaces' under the OSPF process
Why this is correct
This enables BFD for all OSPF neighbors on the router.
- ✗
Configure 'ip ospf bfd' under the interface
Why it's wrong here
This command is used for BFD with OSPFv3, not OSPFv2.
- ✗
Configure 'bfd interval 50 min_rx 50 multiplier 3' globally
Why it's wrong here
This sets BFD timers but is not a required step to enable BFD for OSPF; it may be used for tuning.
- ✗
Configure 'router bfd' globally
Why it's wrong here
This is not a valid command; BFD is enabled per interface and per routing protocol.
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.