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300-410 Practice Question: Is troubleshooting a sudden drop in NetFlow data…

A network engineer is troubleshooting a sudden drop in NetFlow data on a Cisco router running IOS-XE 17.x. The engineer verifies that 'ip flow-export destination 10.1.1.100 2055' is configured, and the collector is reachable. However, 'show ip flow export' shows zero packets exported. 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

✓

No flow monitor is applied to any interface.

The issue is that NetFlow generation requires at least one monitor or flow record to be applied to an interface. Without a 'ip flow monitor' or 'ip route-cache flow' command on an interface, no flows are created and thus nothing is exported.

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 collector IP address is incorrect.

    Why it's wrong here

    The engineer already verified reachability, so this is unlikely.

  • ✓

    No flow monitor is applied to any interface.

    Why this is correct

    NetFlow data is only generated when a monitor or flow is enabled on an interface; without it, no flows are exported.

  • ✗

    The export version is set to 9 but the collector expects version 5.

    Why it's wrong here

    Version mismatch would cause the collector to reject packets, but 'show ip flow export' would still show packets sent.

  • ✗

    The router is in a VRF that is not configured for NetFlow export.

    Why it's wrong here

    VRF-specific export configuration is needed only for VRF-aware NetFlow, but the symptom of zero exported packets points to no flow generation.

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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.