300-440 Question 285
Single answerA network engineer has configured Flexible NetFlow on a Cisco router to monitor traffic patterns. However, the NetFlow collector is not receiving any data from the router. Upon reviewing the configuration, the engineer verifies that the flow exporter and flow monitor are configured correctly. What is the most likely cause of this issue?
- A
The flow monitor is not applied to any interface.
- B
The NetFlow version configured on the router does not match the collector's version.
- C
The router does not have sufficient CPU resources to export the NetFlow data.
- D
The flow record is missing the 'match' and 'collect' fields.
Show answer and explanation
Correct answer: A
Explanation
In Flexible NetFlow, it is essential to apply the flow monitor to an interface for traffic data to be collected and exported. Even if the flow exporter and monitor are correctly configured, failing to apply the monitor to an interface will prevent traffic data from being sent to the NetFlow collector.
- A. Correct.
For Flexible NetFlow to function properly, the flow monitor must be applied to an interface. Without this step, no data will be collected or sent to the NetFlow collector.
- B. Incorrect.
While a mismatch in NetFlow versions can cause issues, in this scenario the configuration of the flow exporter and monitor has already been verified, so this is unlikely the primary cause.
- C. Incorrect.
CPU resource constraints can cause NetFlow export issues, but this is not the most common cause for the described symptoms.
- D. Incorrect.
A missing 'match' or 'collect' field in the flow record would prevent proper data collection, but this would likely have been identified during the configuration verification process.