- A
The 'ip flow-export source' command is set to the management interface, which becomes the source IP of export packets.
The export source IP is the source of the NetFlow packets, not the flow data. The collector should display flow source IPs separately.
- B
The router is performing NAT on the flow data before exporting.
Why wrong: NetFlow exports raw packet headers; NAT is not applied to flow records.
- C
The flow record is configured to match the router's interface IP as the source.
Why wrong: Legacy NetFlow does not use flow records; it always exports actual source/destination IPs.
- D
The collector is misconfigured to display the export packet source instead of the flow source.
Why wrong: While possible, the more direct cause is the export source command; the collector should still show flow source IPs correctly.
300-410 NetFlow and Flexible NetFlow Practice Question
This 300-410 practice question tests your understanding of netflow and flexible netflow. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer configures NetFlow on a router using the legacy 'ip flow-export' commands. After applying 'ip route-cache flow' on an interface, 'show ip flow export' shows packets being sent, but the collector reports that all flows have a source IP of the router's management interface instead of the actual source IPs. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 'ip flow-export source' command is set to the management interface, which becomes the source IP of export packets.
In legacy NetFlow, the 'ip flow-export source' command sets the source IP of export packets, not the flow data. The symptom described is normal; the collector sees the source IP of the export packets, not the flow source IPs. However, if the collector is misconfigured to interpret the export source as flow source, that is a collector issue. But more likely, the engineer is misreading the collector output. The question tests understanding that export source IP is not the flow source.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 'ip flow-export source' command is set to the management interface, which becomes the source IP of export packets.
Why this is correct
The export source IP is the source of the NetFlow packets, not the flow data. The collector should display flow source IPs separately.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The router is performing NAT on the flow data before exporting.
Why it's wrong here
NetFlow exports raw packet headers; NAT is not applied to flow records.
- ✗
The flow record is configured to match the router's interface IP as the source.
Why it's wrong here
Legacy NetFlow does not use flow records; it always exports actual source/destination IPs.
- ✗
The collector is misconfigured to display the export packet source instead of the flow source.
Why it's wrong here
While possible, the more direct cause is the export source command; the collector should still show flow source IPs correctly.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
While possible, the more direct cause is the export source command; the collector should still show flow source IPs correctly.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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NetFlow and Flexible NetFlow — study guide chapter
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FAQ
Questions learners often ask
What does this 300-410 question test?
NetFlow and Flexible NetFlow — This question tests NetFlow and Flexible NetFlow — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The 'ip flow-export source' command is set to the management interface, which becomes the source IP of export packets. — In legacy NetFlow, the 'ip flow-export source' command sets the source IP of export packets, not the flow data. The symptom described is normal; the collector sees the source IP of the export packets, not the flow source IPs. However, if the collector is misconfigured to interpret the export source as flow source, that is a collector issue. But more likely, the engineer is misreading the collector output. The question tests understanding that export source IP is not the flow source.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 19, 2026
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