- A
The 'ip flow-export destination' command is missing or specifies an incorrect UDP port number.
Correct because the export destination must include the correct IP and UDP port; if missing or wrong, export packets won't reach the collector.
- B
The router is using TCP for NetFlow export, but the collector only supports UDP.
Why wrong: Incorrect because NetFlow export uses UDP by default; TCP is not supported for NetFlow export.
- C
The flow monitor is not applied to any interface, so no flows are being collected.
Why wrong: Incorrect because even if no flows are collected, the export packets would be sent if the destination is configured; the issue is export reachability.
- D
The 'ip flow-export timeout rate' is set too high, causing export packets to be delayed.
Why wrong: Incorrect because the timeout setting affects when flows are exported, not whether export packets are sent or reach the collector.
Quick Answer
The answer is that the 'ip flow-export destination' command is missing or specifies an incorrect UDP port number. NetFlow export uses UDP as its transport protocol, meaning the router sends flow records to a collector listening on a specific UDP port—commonly 2055 or 9996—and if that port is misconfigured or omitted, the collector will never receive the packets, even though it remains reachable via ICMP. On the ENCOR 350-401 exam, this question tests your understanding that NetFlow relies on UDP, not TCP, and that the export destination command must include both the collector IP and the correct UDP port; a common trap is assuming a reachable IP alone guarantees delivery. Remember that NetFlow is a one-way UDP push, so the collector must be listening on the exact port specified. A handy memory tip: “UDP is the only way—NetFlow doesn’t shake hands.”
CCNP NetFlow and Telemetry Practice Question
This 350-401 practice question tests your understanding of netflow and telemetry. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is configuring NetFlow on a Cisco ISR 4451 router to analyze traffic patterns. The engineer wants to export flow data to a collector every 60 seconds. After applying the configuration, the engineer notices that the export packets are not reaching the collector. The collector is reachable via ICMP. 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 destination' command is missing or specifies an incorrect UDP port number.
NetFlow export uses UDP as the transport protocol, and the collector must be listening on the correct UDP port. Option A is correct because the export destination must specify the correct UDP port. Option B is incorrect because NetFlow does not require TCP. Option C is incorrect because the flow monitor is needed for Flexible NetFlow, but traditional NetFlow uses 'ip flow-export'. Option D is incorrect because the timeout setting affects when flows are exported, not the reachability of export packets.
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 destination' command is missing or specifies an incorrect UDP port number.
Why this is correct
Correct because the export destination must include the correct IP and UDP port; if missing or wrong, export packets won't reach the collector.
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 using TCP for NetFlow export, but the collector only supports UDP.
- ✗
The flow monitor is not applied to any interface, so no flows are being collected.
Why it's wrong here
Incorrect because even if no flows are collected, the export packets would be sent if the destination is configured; the issue is export reachability.
- ✗
The 'ip flow-export timeout rate' is set too high, causing export packets to be delayed.
Why it's wrong here
Incorrect because the timeout setting affects when flows are exported, not whether export packets are sent or reach the collector.
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.
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 350-401 NAT questions on configuration and troubleshooting.
- →
NetFlow and Telemetry — study guide chapter
Learn the concepts, then practise the questions
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NetFlow and Telemetry practice questions
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FAQ
Questions learners often ask
What does this 350-401 question test?
NetFlow and Telemetry — This question tests NetFlow and Telemetry — 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 destination' command is missing or specifies an incorrect UDP port number. — NetFlow export uses UDP as the transport protocol, and the collector must be listening on the correct UDP port. Option A is correct because the export destination must specify the correct UDP port. Option B is incorrect because NetFlow does not require TCP. Option C is incorrect because the flow monitor is needed for Flexible NetFlow, but traditional NetFlow uses 'ip flow-export'. Option D is incorrect because the timeout setting affects when flows are exported, not the reachability of export packets.
What should I do if I get this 350-401 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 350-401 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 18, 2026
This 350-401 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 350-401 exam.
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