Question 626 of 2,152

NetFlow and Flexible NetFlow →hardMultiple SelectObjective-mapped

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.

An engineer configures Flexible NetFlow with a user-defined flow record that includes 'match ipv4 source address' and 'collect counter bytes'. Which TWO additional statements about this configuration are true? (Choose TWO.)

A
The flow record must be applied directly to an interface using the 'ip flow record' command.
Why wrong: Incorrect. The flow record is not applied directly to an interface. It is referenced by a flow monitor, which is then applied to the interface via 'ip flow monitor'.
B
The 'match ipv4 source address' command defines a key field that is used to uniquely identify flows.
Correct. Match fields are key fields; flows are differentiated based on their values. Here, only the source IP is used as a key.
C
The 'collect counter bytes' command causes the router to count the total number of bytes for each unique flow.
Correct. The 'collect counter bytes' field is a non-key field that accumulates the byte count for each flow key.
D
If no 'match' commands are configured, the router will use the default match fields from the 'netflow-original' record.
Why wrong: Incorrect. A user-defined flow record must include at least one 'match' command; otherwise, the configuration is rejected.
E
The flow record can be used by both IPv4 and IPv6 traffic simultaneously without additional configuration.
Why wrong: Incorrect. Flow records are protocol-specific. To monitor both IPv4 and IPv6, you need separate flow records (e.g., 'match ipv4 ...' and 'match ipv6 ...') or use the 'ip' keyword for both.

Full breakdown with real-world context →

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 'match ipv4 source address' command defines a key field that is used to uniquely identify flows.

In Flexible NetFlow, the 'match' fields define the flow key; flows are uniquely identified by the combination of all match fields. The 'collect' fields define non-key data that is aggregated per flow. The flow record must be referenced by a flow monitor, which is then applied to an interface. The default flow record is 'netflow-original', which includes many default keys. The 'match' fields cannot be omitted; at least one match field is required. The 'collect' fields are optional and can include counters, timestamps, etc.

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.

✗
The flow record must be applied directly to an interface using the 'ip flow record' command.
Why it's wrong here
Incorrect. The flow record is not applied directly to an interface. It is referenced by a flow monitor, which is then applied to the interface via 'ip flow monitor'.
✓
The 'match ipv4 source address' command defines a key field that is used to uniquely identify flows.
Why this is correct
Correct. Match fields are key fields; flows are differentiated based on their values. Here, only the source IP is used as a key.
Related concept
Read the scenario before looking for a memorised answer.
✓
The 'collect counter bytes' command causes the router to count the total number of bytes for each unique flow.
Why this is correct
Correct. The 'collect counter bytes' field is a non-key field that accumulates the byte count for each flow key.
Related concept
Read the scenario before looking for a memorised answer.
✗
If no 'match' commands are configured, the router will use the default match fields from the 'netflow-original' record.
Why it's wrong here
Incorrect. A user-defined flow record must include at least one 'match' command; otherwise, the configuration is rejected.
✗
The flow record can be used by both IPv4 and IPv6 traffic simultaneously without additional configuration.
Why it's wrong here
Incorrect. Flow records are protocol-specific. To monitor both IPv4 and IPv6, you need separate flow records (e.g., 'match ipv4 ...' and 'match ipv6 ...') or use the 'ip' keyword for both.

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.

Trap categories for this question

Keyword trap
Incorrect. Flow records are protocol-specific. To monitor both IPv4 and IPv6, you need separate flow records (e.g., 'match ipv4 ...' and 'match ipv6 ...') or use the 'ip' keyword for both.
Command / output trap
Incorrect. A user-defined flow record must include at least one 'match' command; otherwise, the configuration is rejected.

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 300-410 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 300-410 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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FAQ

Questions learners often ask

What does this 300-410 question test?

NetFlow and Flexible NetFlow — This question tests NetFlow and Flexible NetFlow — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The 'match ipv4 source address' command defines a key field that is used to uniquely identify flows. — In Flexible NetFlow, the 'match' fields define the flow key; flows are uniquely identified by the combination of all match fields. The 'collect' fields define non-key data that is aggregated per flow. The flow record must be referenced by a flow monitor, which is then applied to an interface. The default flow record is 'netflow-original', which includes many default keys. The 'match' fields cannot be omitted; at least one match field is required. The 'collect' fields are optional and can include counters, timestamps, etc.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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