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300-410 Practice Question: Is troubleshooting a VRF-Lite setup where a…
A network engineer is troubleshooting a VRF-Lite setup where a router is configured with VRF_GREEN. The engineer pings the gateway IP of a host in VRF_GREEN from the router, but the ping fails. The 'show ip route vrf VRF_GREEN' command shows the connected network for the host's subnet. The 'show ip interface brief' shows the interface is up/up. 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 host's IP address is not in the same subnet as the router's interface IP in VRF_GREEN.
If the interface is up and the route is present, the issue might be with ARP resolution or the host's configuration. However, in VRF-Lite, the router might not be able to ping the gateway if the gateway IP is not in the same subnet as the interface IP, or if the host has a firewall blocking ICMP.
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 host's default gateway is not set to the router's interface IP in VRF_GREEN.
Why it's wrong here
This would cause the host to not send traffic to the router, but the router's ping to the host should still work if the host responds to ARP.
- ✗
The router's interface in VRF_GREEN has 'ip proxy-arp' disabled.
Why it's wrong here
Proxy ARP is not needed for direct communication within the same subnet.
- ✓
The host's IP address is not in the same subnet as the router's interface IP in VRF_GREEN.
Why this is correct
If the host's IP is in a different subnet, the router will not have a connected route for that host, and ARP will fail.
- ✗
The 'ip routing' command is disabled in VRF_GREEN.
Why it's wrong here
IP routing is a global command and cannot be disabled per VRF.
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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.