mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Has configured BFD for OSPF as shown: interface…
A network engineer has configured BFD for OSPF as shown:
interface GigabitEthernet0/0
bfd interval 300 min_rx 300 multiplier 3 !
router ospf 1
bfd all-interfaces !
However, BFD sessions are not coming up. What is the most likely missing 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
✓
The interface has no IP address configured.
BFD requires that the interface has an IP address and is up/up. The configuration shown lacks an IP address on the interface, which is necessary for BFD to establish a session.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The 'bfd all-interfaces' command should be replaced with 'bfd interface GigabitEthernet0/0'.
Why it's wrong here
'bfd all-interfaces' is valid and enables BFD on all interfaces; it is not the issue.
- ✓
The interface has no IP address configured.
Why this is correct
Correct. Without an IP address on the interface, OSPF cannot form a neighbor relationship, and BFD requires an established OSPF adjacency to operate.
- ✗
The BFD timers must be set to 100 ms or less for OSPF.
Why it's wrong here
There is no such requirement; BFD timers can be any value supported by the platform.
- ✗
The router must be configured with 'bfd map' commands for each neighbor.
Why it's wrong here
BFD does not require 'bfd map' commands; that is used for static BFD, not for dynamic routing protocols.
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.