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300-410 Practice Question: Consider the following partial configuration on a…
Consider the following partial configuration on a router:
interface GigabitEthernet0/1 ip address 10.1.1.1 255.255.255.252
bfd interval 100 min_rx 100 multiplier 3 !
router ospf 1 network 10.1.1.0 0.0.0.3 area 0
!
What is the effect of this configuration?
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
✓
BFD is configured on the interface but will not be used by OSPF unless the 'bfd all-interfaces' command is added under router ospf.
The BFD configuration is applied under the interface, but OSPF must be explicitly configured to use BFD via the 'bfd all-interfaces' command under the OSPF routing process. Without this, BFD will not be used for OSPF neighbor failure detection.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BFD is enabled for OSPF on this interface and will detect failures faster than OSPF's hello/dead timers.
Why it's wrong here
Incorrect because OSPF must be configured to use BFD with 'bfd all-interfaces' or 'bfd interface' under the OSPF process.
- ✓
BFD is configured on the interface but will not be used by OSPF unless the 'bfd all-interfaces' command is added under router ospf.
Why this is correct
Correct. BFD interface configuration alone does not enable BFD for OSPF; the routing protocol must be told to use it.
- ✗
BFD will only be used if the neighbor also has BFD configured with the same timer values.
Why it's wrong here
While BFD requires both sides to have BFD configured, the primary issue here is that OSPF is not enabled to use BFD.
- ✗
The BFD configuration is invalid because the interval and min_rx values must be identical on both sides.
Why it's wrong here
BFD timers are negotiated; they do not need to be identical. The router proposes its values and the neighbor may accept or adjust.
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.