Question 1,002 of 2,152

NetFlow and Flexible NetFlow →hardMultiple ChoiceObjective-mapped

Flexible NetFlow IPv4/IPv6 Separate Monitors

This 300-410 practice question tests your understanding of netflow and flexible netflow. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 on a router to monitor both IPv4 and IPv6 traffic. The flow record is defined with 'match ipv4 source address' and 'match ipv6 source address'. After applying the monitor to an interface, 'show flow monitor name MONITOR cache' shows only IPv4 flows. 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.

A
IPv6 traffic is not present on the interface.
Why wrong: IPv6 traffic may or may not be present; the issue is not traffic absence but exporter configuration.
B
The flow record cannot combine IPv4 and IPv6 match fields; separate monitors are needed.
Why wrong: While IPv4 and IPv6 match fields cannot be combined in one record, the monitor is applied; the cache shows IPv4 only, indicating the record is applied but IPv6 is not being exported.
C
The interface does not have IPv6 enabled.
Why wrong: The interface likely has IPv6 enabled if traffic is being routed.
D
The flow exporter is not configured to send IPv6 flows.
The exporter must be configured to send IPv6 flow records; without it, IPv6 flows are not exported and may not appear in the cache.

Full breakdown with real-world context →

Quick Answer

The answer is that separate monitors are required because a single Flexible NetFlow flow record cannot combine IPv4 and IPv6 match fields. This is due to the fundamental design of Flexible NetFlow, where each flow record is tied to a specific address family; mixing match ipv4 source address and match ipv6 source address in the same record is invalid, causing the router to silently ignore the unsupported family. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of how Flexible NetFlow handles dual-stack environments—a common trap is assuming a single monitor can capture both traffic types. To avoid this, remember that IPv4 and IPv6 require separate flow monitors, each with its own record, applied together to the same interface. Memory tip: “One record, one family—mix them, and you’ll only see one.”

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 flow exporter is not configured to send IPv6 flows.

If the flow exporter is not configured to send IPv6 flows, the router may not process IPv6 traffic for flow monitoring, resulting in only IPv4 flows appearing in the cache. Ensure the exporter is set up for both address families.

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.

✗
IPv6 traffic is not present on the interface.
Why it's wrong here
IPv6 traffic may or may not be present; the issue is not traffic absence but exporter configuration.
✗
The flow record cannot combine IPv4 and IPv6 match fields; separate monitors are needed.
Why it's wrong here
While IPv4 and IPv6 match fields cannot be combined in one record, the monitor is applied; the cache shows IPv4 only, indicating the record is applied but IPv6 is not being exported.
✗
The interface does not have IPv6 enabled.
Why it's wrong here
The interface likely has IPv6 enabled if traffic is being routed.
✓
The flow exporter is not configured to send IPv6 flows.
Why this is correct
The exporter must be configured to send IPv6 flow records; without it, IPv6 flows are not exported and may not appear in the cache.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.

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

Command / output trap
While IPv4 and IPv6 match fields cannot be combined in one record, the monitor is applied; the cache shows IPv4 only, indicating the record is applied but IPv6 is not being exported.

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 flow exporter is not configured to send IPv6 flows. — If the flow exporter is not configured to send IPv6 flows, the router may not process IPv6 traffic for flow monitoring, resulting in only IPv4 flows appearing in the cache. Ensure the exporter is set up for both address families.

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

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?

Read the scenario before looking for a memorised answer.

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