The answer is to increase the NetFlow export buffer size and configure the export retry interval. This is correct because NetFlow export relies on UDP, a connectionless and unreliable protocol, meaning flow records can be lost if the collector is temporarily unreachable. By enlarging the export buffer, the switch stores more records locally, and the retry mechanism ensures those buffered records are re-sent until the collector acknowledges receipt or the retry limit is exhausted. On the ENCOR 350-401 exam, this concept tests your understanding of NetFlow reliability mechanisms versus common misconceptions—many candidates mistakenly assume TCP is supported for export, but Cisco Nexus switches only use UDP for NetFlow v9 and IPFIX. A frequent trap is confusing NetFlow buffering with SNMP traps or IP SLA, which do not store flow data. Memory tip: think "UDP is unreliable, so buffer and retry are your safety net."
CCNP NetFlow and Telemetry Practice Question
This 350-401 practice question tests your understanding of netflow and telemetry. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 Nexus 7000 switch to monitor traffic between two data centers. The engineer wants to ensure that flow records are exported even if the export destination is temporarily unreachable. Which feature should the engineer enable?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the NetFlow export buffer size and configure the export retry interval.
NetFlow export uses UDP, which is unreliable. Option A is correct because NetFlow export buffer and retry mechanisms (like 'ip flow-export buffer-size' and 'ip flow-export retry') can store and retransmit records. Option B is incorrect because TCP is not supported for NetFlow export. Option C is incorrect because SNMP traps are not for flow data. Option D is incorrect because IP SLA does not buffer NetFlow records.
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.
✓
Increase the NetFlow export buffer size and configure the export retry interval.
Why this is correct
Correct because increasing the buffer allows storing more records during outages, and retry intervals ensure re-transmission attempts.
Related concept
Static NAT maps one inside address to one outside address.
✗
Change the export protocol to TCP to ensure reliable delivery.
Why it's wrong here
Incorrect because NetFlow export does not support TCP; it uses UDP exclusively.
✗
Enable SNMP traps to notify the collector of flow data.
Why it's wrong here
Incorrect because SNMP traps are not used for NetFlow data; they are for event notifications.
✗
Configure IP SLA to monitor the collector and buffer flows locally.
Why it's wrong here
Incorrect because IP SLA monitors reachability but does not buffer NetFlow records.
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 — 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: Increase the NetFlow export buffer size and configure the export retry interval. — NetFlow export uses UDP, which is unreliable. Option A is correct because NetFlow export buffer and retry mechanisms (like 'ip flow-export buffer-size' and 'ip flow-export retry') can store and retransmit records. Option B is incorrect because TCP is not supported for NetFlow export. Option C is incorrect because SNMP traps are not for flow data. Option D is incorrect because IP SLA does not buffer NetFlow records.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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