- A
NetFlow v9 uses a template-based export format.
Correct because v9 introduces templates that define which fields are exported, allowing flexibility.
- B
IPFIX is the IETF standard version of NetFlow, based on NetFlow v9.
Correct because IPFIX (RFC 7011) is derived from NetFlow v9 and is the standardized version.
- C
NetFlow v5 supports variable-length fields and custom flow keys.
Why wrong: Incorrect because v5 has a fixed format with 7 predefined fields; it does not support variable-length or custom keys.
- D
NetFlow export uses TCP by default to ensure reliable delivery.
Why wrong: Incorrect because NetFlow uses UDP by default; TCP can be configured but is not the default.
- E
NetFlow v5 can export IPv6 flow information.
Why wrong: Incorrect because v5 was designed for IPv4 only; IPv6 support requires v9 or IPFIX.
Quick Answer
The correct answer is that IPFIX is the IETF standard version of NetFlow, based on NetFlow v9, because v9 introduced template-based flexibility that IPFIX formalized into a standardized protocol. NetFlow v5, by contrast, uses a fixed-format record with exactly seven key fields, making it rigid but simple, while v9 and IPFIX allow custom field definitions through templates, enabling far greater adaptability for modern network monitoring. On the ENCOR 350-401 exam, this distinction tests your understanding of how NetFlow evolved from a static to a dynamic export model, often appearing in questions about default transport protocols—remember that UDP is the default (port 2055 for v5, port 4729 for IPFIX), not TCP, which is a common trap. A useful memory tip: think of v5 as “fixed five” (seven fields, but the name sticks), v9 as “variable nine” (template-driven), and IPFIX as “IETF’s fix” on v9.
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.
Which two statements about NetFlow flow records and export are correct? (Choose two.)
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
NetFlow v9 uses a template-based export format.
NetFlow v5 has a fixed format with 7 key fields, while v9 is template-based and flexible. IPFIX is the IETF standard based on v9. NetFlow export uses UDP by default (port 2055 for v5, 4729 for IPFIX). TCP is not the default transport.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
NetFlow v9 uses a template-based export format.
Why this is correct
Correct because v9 introduces templates that define which fields are exported, allowing flexibility.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
IPFIX is the IETF standard version of NetFlow, based on NetFlow v9.
Why this is correct
Correct because IPFIX (RFC 7011) is derived from NetFlow v9 and is the standardized version.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
NetFlow v5 supports variable-length fields and custom flow keys.
Why it's wrong here
Incorrect because v5 has a fixed format with 7 predefined fields; it does not support variable-length or custom keys.
- ✗
NetFlow export uses TCP by default to ensure reliable delivery.
- ✗
NetFlow v5 can export IPv6 flow information.
Why it's wrong here
Incorrect because v5 was designed for IPv4 only; IPv6 support requires v9 or IPFIX.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-401 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 350-401 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: NetFlow v9 uses a template-based export format. — NetFlow v5 has a fixed format with 7 key fields, while v9 is template-based and flexible. IPFIX is the IETF standard based on v9. NetFlow export uses UDP by default (port 2055 for v5, 4729 for IPFIX). TCP is not the default transport.
What should I do if I get this 350-401 question wrong?
Identify which 350-401 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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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