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300-410 Practice Question: Which THREE symptoms indicate a misconfiguration…
Which THREE symptoms indicate a misconfiguration in a VRF-Lite deployment where two routers are connected via a trunk link and each VRF should have connectivity? (Choose THREE.)
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
✓
Pings between hosts in the same VRF across the trunk link fail.
Common symptoms include: pings failing between devices in the same VRF across the link, missing routes in the VRF routing table, and the VRF interface showing up/down due to misconfiguration. The incorrect options: a default route in the global table is not a VRF-Lite symptom; high CPU is not specific to VRF-Lite.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Pings between hosts in the same VRF across the trunk link fail.
Why this is correct
Indicates that the VRF forwarding or subinterface configuration may be incorrect.
- ✓
The 'show ip route vrf <vrf-name>' command shows no routes for the connected subnet.
Why this is correct
Missing routes suggest that the interface is not correctly assigned to the VRF or the routing protocol is not configured.
- ✓
The interface assigned to the VRF is in 'up/down' state.
Why this is correct
Often caused by mismatched VLAN encapsulation or VRF misconfiguration on the subinterface.
- ✗
The global routing table contains a default route pointing to the ISP.
Why it's wrong here
This is normal for Internet connectivity and not a symptom of VRF-Lite misconfiguration.
- ✗
The router CPU utilization is consistently above 90%.
Why it's wrong here
High CPU can have many causes; it is not a specific symptom of VRF-Lite issues.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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