hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Configures Flexible NetFlow to export traffic…
A network engineer configures Flexible NetFlow to export traffic statistics for a VRF named CUSTOMER_A. The configuration includes 'flow exporter EXPORTER' with destination 10.10.10.10:2055 and 'vrf CUSTOMER_A' under the exporter. The flow monitor is applied to the VRF interface. However, 'show flow monitor name MONITOR cache' shows no entries for VRF traffic. 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 flow monitor is applied to the global routing table interface instead of the VRF interface.
For VRF-aware NetFlow, the flow monitor must be applied using the 'ip flow monitor MONITOR input' command under the VRF interface, and the exporter must reference the VRF. A common mistake is forgetting to apply the monitor to the interface in the VRF context.
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 exporter is missing the 'source' interface command.
Why it's wrong here
Missing source interface affects export reachability, not cache population.
- ✓
The flow monitor is applied to the global routing table interface instead of the VRF interface.
Why this is correct
The monitor must be applied under the VRF interface (e.g., interface GigabitEthernet0/1.100 with encapsulation dot1q and VRF forwarding CUSTOMER_A). Applying it to the physical interface without VRF will not capture VRF traffic.
- ✗
The VRF is not configured with 'ip flow-export' commands.
Why it's wrong here
VRF-aware export uses the exporter's VRF statement; separate 'ip flow-export' under VRF is not required.
- ✗
The flow record does not match any VRF-specific fields.
Why it's wrong here
Matching VRF fields is optional; flows are still generated based on standard keys.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
NetFlow Configuration
NetFlow Configuration is the process of setting up Cisco devices to collect and export metadata about network traffic flows for monitoring, analysis, and troubleshooting.
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
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