hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures BFD for EIGRP in named mode
An engineer configures BFD for EIGRP in named mode. The BFD session is up, but the EIGRP neighbor relationship is not forming. The engineer checks that the K values match and that the interfaces are up. What is the most likely explanation?
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 'no neighbor' command is configured under the af-interface, disabling EIGRP on that interface.
In EIGRP named mode, the 'af-interface' configuration can have different settings than classic mode. Specifically, the 'no neighbor' command under the af-interface can disable EIGRP on that interface, preventing adjacency formation. BFD is configured under the af-interface as well, but if the interface is disabled for EIGRP, BFD will not help.
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 'no neighbor' command is configured under the af-interface, disabling EIGRP on that interface.
Why this is correct
Correct. In named mode, the 'no neighbor' command under the af-interface prevents EIGRP from forming adjacencies on that interface, even if BFD is up.
- ✗
The 'bfd' command is configured under the af-interface, but the 'bfd all-interfaces' command is missing under the EIGRP process.
Why it's wrong here
Incorrect. In named mode, BFD is enabled per af-interface, not globally. The 'bfd all-interfaces' command is not used in named mode.
- ✗
The EIGRP router ID is the same on both routers, causing a conflict.
Why it's wrong here
Incorrect. EIGRP does not use router ID for adjacency formation; it uses K values and AS number.
- ✗
The interface is configured with 'ip bandwidth-percent eigrp' set to 0, preventing EIGRP from using the interface.
Why it's wrong here
Incorrect. The bandwidth-percent command affects how much bandwidth EIGRP can use, not adjacency formation.
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.