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300-410 Practice Question: Examine the partial BFD configuration on a…
Examine the partial BFD configuration on a router:
interface GigabitEthernet0/0
bfd interval 100 min_rx 100 multiplier 3 !
interface GigabitEthernet0/1
bfd interval 200 min_rx 200 multiplier 3 !
router ospf 1
bfd all-interfaces !
The router has OSPF neighbors on both interfaces. Which statement is true?
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 BFD session on GigabitEthernet0/0 will detect failures in 300 ms, and on GigabitEthernet0/1 in 600 ms.
BFD timers are configured per interface. Each BFD session independently uses the timers configured on its respective interface. The multiplier is applied per 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.
- ✗
Both BFD sessions will use the same timer values because OSPF is configured with 'bfd all-interfaces'.
Why it's wrong here
BFD timers are interface-specific; 'bfd all-interfaces' only enables BFD on all OSPF interfaces, but each interface retains its own timers.
- ✓
The BFD session on GigabitEthernet0/0 will detect failures in 300 ms, and on GigabitEthernet0/1 in 600 ms.
Why this is correct
Correct. Detection time = multiplier * interval. For Gi0/0: 3*100=300 ms; for Gi0/1: 3*200=600 ms.
- ✗
The BFD session on GigabitEthernet0/1 will not form because the interval is too high.
Why it's wrong here
200 ms is a valid BFD interval; there is no upper limit that prevents session formation.
- ✗
The router will use the minimum interval across all interfaces for consistency.
Why it's wrong here
BFD timers are independent per interface.
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.