hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Is troubleshooting a VRF-Lite setup where two…
A network engineer is troubleshooting a VRF-Lite setup where two routers are connected via a serial link. Each router has VRF_SALES configured. The engineer configures EIGRP in VRF_SALES. The 'show ip eigrp vrf VRF_SALES neighbors' shows no neighbors. The 'show ip eigrp vrf VRF_SALES interfaces' shows the serial interface is passive. What is the most likely cause?
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 'passive-interface default' command is configured under the EIGRP process for VRF_SALES.
If an interface is marked as passive in EIGRP, it will not send or receive hello packets, preventing neighbor formation. This is a common misconfiguration.
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 'passive-interface default' command is configured under the EIGRP process for VRF_SALES.
Why this is correct
This command makes all interfaces passive by default, and if the serial interface is not explicitly set to no passive, it will remain passive.
- ✗
The 'network' command for the serial interface's subnet is missing.
Why it's wrong here
Missing network command would prevent EIGRP from running on the interface, but the interface would not show as passive.
- ✗
The 'autonomous-system' number is different on the two routers.
Why it's wrong here
Different AS numbers would prevent neighbor formation, but the interface would still be active, not passive.
- ✗
The 'metric weights' command is misconfigured.
Why it's wrong here
Metric weights affect route calculation, not neighbor discovery.
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.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
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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.