- 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.
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.
300-410 NetFlow and Flexible NetFlow Practice Question
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?
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: 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.
- ✓
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
Static NAT maps one inside address to one outside address.
- ✗
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: 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 300-410 NAT questions on configuration and troubleshooting.
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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 — Static NAT maps one inside address to one outside address..
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?
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 300-410 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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Last reviewed: Jun 19, 2026
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