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300-410 Practice Question: Is troubleshooting a VRF-Lite configuration on a…
A network engineer is troubleshooting a VRF-Lite configuration on a Cisco router. The router has two VRFs (VRF_CUSTOMER_A and VRF_CUSTOMER_B). The engineer notices that traffic from VRF_CUSTOMER_A is being routed to the wrong next-hop, causing connectivity issues. The 'show ip route vrf VRF_CUSTOMER_A' shows a route to the destination via a next-hop that belongs to VRF_CUSTOMER_B. 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 'route-target import' command in VRF_CUSTOMER_A is importing routes from VRF_CUSTOMER_B.
This issue is typically caused by route leaking between VRFs, which can happen if the route-target import/export commands are misconfigured or if there is a shared interface with incorrect VRF assignment.
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 'route-target import' command in VRF_CUSTOMER_A is importing routes from VRF_CUSTOMER_B.
Why this is correct
This causes routes from VRF_CUSTOMER_B to appear in VRF_CUSTOMER_A's routing table, leading to incorrect next-hop selection.
- ✗
The router has a default route that points to the next-hop in VRF_CUSTOMER_B.
Why it's wrong here
A default route would only be used if no specific route exists, and the route in question is specific.
- ✗
The 'ip cef' command is disabled globally.
Why it's wrong here
Disabling CEF would affect performance but not cause cross-VRF route selection.
- ✗
The 'ip vrf forwarding' command is applied to the same physical interface for both VRFs.
Why it's wrong here
An interface can only belong to one VRF; applying it to both would cause an error.
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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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.