Question 1,707 of 2,152

NetFlow and Flexible NetFlow →mediumMultiple ChoiceObjective-mapped

Bidirectional NetFlow Monitoring and Cache Timeouts

This 300-410 practice question tests your understanding of netflow and flexible netflow. 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.

Examine this partial configuration on router R3:

flow record RECORD-2 match ipv4 source address match ipv4 destination address match ipv4 protocol match transport source-port match transport destination-port collect counter bytes collect counter packets ! flow monitor MONITOR-3 record RECORD-2 cache timeout active 60 cache timeout inactive 15 !

interface GigabitEthernet0/3
 ip flow monitor MONITOR-3 input
 ip flow monitor MONITOR-3 output

Which statement is true about this configuration?

A
The router will create separate flow records for traffic entering and leaving GigabitEthernet0/3, doubling the cache entries.
Applying the same flow monitor in both input and output directions creates separate flow entries for each direction, effectively doubling the cache usage.
B
The router will aggregate input and output flows into a single cache entry for each unique flow.
Why wrong: Flexible NetFlow does not aggregate flows from different directions; each direction is tracked independently.
C
The inactive timeout of 15 seconds will cause flows to be exported only after 15 seconds of inactivity, overriding the active timeout.
Why wrong: Both timeouts are independent; active timeout exports ongoing flows every 60 seconds, while inactive timeout exports idle flows after 15 seconds.
D
The configuration is invalid because a flow monitor cannot be applied to both input and output on the same interface.
Why wrong: It is valid to apply the same flow monitor in both directions; this is a common practice for full traffic visibility.

Full breakdown with real-world context →

Quick Answer

The answer is that the router will create separate flow records for traffic entering and leaving GigabitEthernet0/3, doubling the cache entries. This occurs because the ip flow monitor command is applied to both the input and output directions on the same interface, and each direction is treated as an independent flow observation point. When bidirectional flow monitoring with both timeouts is configured, the router maintains distinct cache entries for inbound and outbound traffic, even for the same session, effectively doubling the number of records. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how flow monitors interact with interface directionality and cache timeout parameters like active 60 and inactive 15. A common trap is assuming that a single flow record captures both directions, but the cache timeout settings apply per-direction, so each direction generates its own entry. Memory tip: think of a door—traffic entering and leaving are two separate trips, each needing its own ticket in the cache.

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 router will create separate flow records for traffic entering and leaving GigabitEthernet0/3, doubling the cache entries.

This question tests understanding of bidirectional flow monitoring and cache timeout interaction.

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 router will create separate flow records for traffic entering and leaving GigabitEthernet0/3, doubling the cache entries.
Why this is correct
Applying the same flow monitor in both input and output directions creates separate flow entries for each direction, effectively doubling the cache usage.
Related concept
Read the scenario before looking for a memorised answer.
✗
The router will aggregate input and output flows into a single cache entry for each unique flow.
Why it's wrong here
Flexible NetFlow does not aggregate flows from different directions; each direction is tracked independently.
✗
The inactive timeout of 15 seconds will cause flows to be exported only after 15 seconds of inactivity, overriding the active timeout.
Why it's wrong here
Both timeouts are independent; active timeout exports ongoing flows every 60 seconds, while inactive timeout exports idle flows after 15 seconds.
✗
The configuration is invalid because a flow monitor cannot be applied to both input and output on the same interface.
Why it's wrong here
It is valid to apply the same flow monitor in both directions; this is a common practice for full traffic visibility.

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 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 router will create separate flow records for traffic entering and leaving GigabitEthernet0/3, doubling the cache entries. — This question tests understanding of bidirectional flow monitoring and cache timeout interaction.

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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