- A
The flow monitor is configured with a sampler that causes the router to process packets in software, and the software path learns more specific routes from routing updates that are not summarized.
When a sampler is used, packets are punted to the CPU for sampling, and the CPU may process routing updates that contain more specific routes, which are then installed in the routing table, bypassing the summary.
- B
The flow monitor is using a flow record that includes the 'ipv4 destination prefix' field, causing the router to install a route for each destination.
Why wrong: Flow records do not install routes.
- C
The summary route is not configured correctly; it should be a range of /8, but the more specific routes are from a different EIGRP process.
Why wrong: The summary route is configured, but the more specific routes appear, indicating a leak.
- D
The flow exporter is sending the more specific routes to the collector, which then redistributes them back.
Why wrong: The collector does not inject routes into the routing table.
Quick Answer
The answer is that a sampler configured in the Flexible NetFlow monitor forces the router to process packets in the software path, which learns more specific routes from routing updates that bypass the configured summary. When a sampler is applied, the router cannot use Cisco Express Forwarding (CEF) in hardware for sampled packets, so it punts them to the CPU for software switching. In the software path, the router processes every routing update individually, including the more specific prefixes that the summary command was intended to suppress, causing them to appear in the routing table alongside the summary route. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of how Flexible NetFlow interacts with CEF and route summarization—a common trap is assuming NetFlow only affects monitoring, not forwarding behavior. Remember the memory tip: “Sampling sends to software, breaking the summary’s shelter.”
300-410 NetFlow and Flexible NetFlow Practice Question
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.
A network uses route summarization to reduce routing table size. After enabling Flexible NetFlow, some routes that were previously summarized are now being advertised individually. Router R1 has: interface GigabitEthernet0/0 ip summary-address eigrp 100 10.0.0.0 255.0.0.0. The flow monitor is applied to the same interface. show ip route eigrp | include (10.0.0.0/8) shows the summary route, but also shows more specific routes like 10.1.0.0/16. What is the root cause?
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 monitor is configured with a sampler that causes the router to process packets in software, and the software path learns more specific routes from routing updates that are not summarized.
Flexible NetFlow can cause the router to process packets differently, but it should not affect route summarization. However, if the flow monitor is configured with a flow record that includes the 'ipv4 source prefix' or 'ipv4 destination prefix' fields, it might cause the router to install more specific routes in the routing table due to the way the router handles flow cache entries. The correct answer is that the flow monitor is using a flow record that includes the 'ipv4 destination prefix' field, and the router is using that to create a route cache that overrides the summary route. But this is not standard behavior. The more likely root cause is that the summary route is configured on the interface, but the flow monitor is applied in the input direction, and the router's CEF (Cisco Express Forwarding) is affected by the flow monitor, causing it to punt packets to the CPU, which then learns more specific routes via the routing protocol. Actually, the correct answer is that the flow monitor is configured with a sampler that causes the router to process packets in software, and the software path learns more specific routes from the routing updates that are not summarized.
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 flow monitor is configured with a sampler that causes the router to process packets in software, and the software path learns more specific routes from routing updates that are not summarized.
Why this is correct
When a sampler is used, packets are punted to the CPU for sampling, and the CPU may process routing updates that contain more specific routes, which are then installed in the routing table, bypassing the summary.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The flow monitor is using a flow record that includes the 'ipv4 destination prefix' field, causing the router to install a route for each destination.
Why it's wrong here
Flow records do not install routes.
- ✗
The summary route is not configured correctly; it should be a range of /8, but the more specific routes are from a different EIGRP process.
Why it's wrong here
The summary route is configured, but the more specific routes appear, indicating a leak.
- ✗
The flow exporter is sending the more specific routes to the collector, which then redistributes them back.
Why it's wrong here
The collector does not inject routes into the routing table.
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 flow monitor is configured with a sampler that causes the router to process packets in software, and the software path learns more specific routes from routing updates that are not summarized. — Flexible NetFlow can cause the router to process packets differently, but it should not affect route summarization. However, if the flow monitor is configured with a flow record that includes the 'ipv4 source prefix' or 'ipv4 destination prefix' fields, it might cause the router to install more specific routes in the routing table due to the way the router handles flow cache entries. The correct answer is that the flow monitor is using a flow record that includes the 'ipv4 destination prefix' field, and the router is using that to create a route cache that overrides the summary route. But this is not standard behavior. The more likely root cause is that the summary route is configured on the interface, but the flow monitor is applied in the input direction, and the router's CEF (Cisco Express Forwarding) is affected by the flow monitor, causing it to punt packets to the CPU, which then learns more specific routes via the routing protocol. Actually, the correct answer is that the flow monitor is configured with a sampler that causes the router to process packets in software, and the software path learns more specific routes from the routing updates that are not summarized.
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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