mediumMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show flow exporter EXPORTER-1
Flow Exporter EXPORTER-1: Description: Exports to collector Export protocol: NetFlow Version 9 Transport Configuration: Destination IP address: 192.168.1.100 Source IP address: 10.0.0.1 Transport Protocol: UDP Destination Port: 2055 Source Port: 0 Collector Configuration: VRFs: Default Options Configuration: Sampler: Not configured Export Statistics: Number of Flows exported: 0 Number of Packets exported: 0 Number of Source IP address unreachable: 0 Number of Packets dropped: 0
Based on this output, what is the most likely reason that no flows are being exported?
⚠ Common exam trap
300-410 often tests the dependency between flow exporters, monitors, and interface application; candidates may focus on port numbers or sampler settings, missing that the exporter must be referenced in a flow monitor.
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 exporter is not referenced in any flow monitor applied to an interface.
The output shows that the flow exporter has no flows exported, and the export statistics are all zero. This indicates that the exporter is not actively exporting data, likely because it is not referenced in a flow monitor that is applied to an interface. Without a flow monitor, the exporter is not triggered to export any flows.
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 destination port is incorrect; NetFlow version 9 requires port 9996.
Why it's wrong here
NetFlow version 9 uses the configurable destination port shown here, commonly 2055; 9996 belongs to IPFIX, so the port is valid. It is tempting because port mismatches do block exports, and that would be correct if the collector actually listened on a different port.
- ✓
The flow exporter is not referenced in any flow monitor applied to an interface.
Why this is correct
Export statistics show zero flows added, so the exporter itself is idle rather than failing. A flow exporter only receives records when a flow monitor referencing it is applied to an interface; without that binding, no cache entries exist to export, matching the zero counters.
- ✗
The source IP address is not reachable from the destination.
Why it's wrong here
The output shows zero source-IP-unreachable events, so reachability is not the fault; the counter would be non-zero if packets failed to route. It is tempting because an unreachable collector genuinely stops exports, and that would be the correct diagnosis when that counter increments.
- ✗
The sampler is not configured, causing all packets to be dropped.
Why it's wrong here
The sampler is optional and only controls flow sampling; its absence does not drop packets, and the dropped counter reads zero. It is tempting because sampling errors can suppress exports, and configuring a sampler would be correct when the collector expects sampled flow records.
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Same concept, more angles
1 more way this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command on Router R1: R1# show flow exporter EXPORTER-1 statistics Flow Exporter: EXPORTER-1 Packet send statistics (last 30 seconds): Packets sent: 0 Packets dropped: 0 Packets unsent: 0 Client send statistics: Packets sent: 0 Packets dropped: 0 Packets unsent: 0 Export statistics: Number of Flows exported: 0 Number of Packets exported: 0 Number of Source IP address unreachable: 0 Number of Packets dropped (no route): 0 Number of Packets dropped (queue full): 0 Based on this output, what is the most likely cause of no exports?
medium- A.The destination IP address is unreachable.
- ✓ B.The flow exporter is not referenced in any flow monitor, or the flow monitor is not attached to an interface.
- C.The UDP port is blocked by a firewall.
- D.The source IP address is not configured on any interface.
Why B: The output shows zero packets sent, zero dropped, and zero unsent across all statistics, with no errors like unreachable destination or no route. This indicates the exporter is not being invoked at all, which typically means the flow exporter is not referenced by any flow monitor, or the flow monitor is not attached to an interface. Without that binding, no flows are exported.
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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