- A
The prefix-list is misconfigured; it should be permit 10.0.0.0/8 le 16 to include /16 prefixes.
Why wrong: le 24 includes /16, so that is not the issue.
- B
The route-map includes a match flow monitor statement that only matches NetFlow monitored traffic, not routing prefixes, causing the route to be denied.
If the route-map uses match flow monitor, it will not match any route because routes are not flows. This is a common misconfiguration when combining NetFlow with route-maps.
- C
The EIGRP metric is too high, causing the route to be suppressed.
Why wrong: The metric is set, but that would not prevent redistribution; it would only affect the metric.
- D
The OSPF route is not in the routing table due to a missing network statement.
Why wrong: The route exists in OSPF, as it is being redistributed, but the route-map is blocking it.
Route Redistribution and NetFlow Match Interaction
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. A key principle to apply: route-map with match flow monitor. 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 company uses EIGRP with route redistribution from OSPF. After configuring Flexible NetFlow to monitor traffic, engineers notice that some routes are missing from the routing table. Router R1 has: router eigrp 100 redistribute ospf 1 metric 10000 100 255 1 1500 route-map FILTER-OSPF. The route-map FILTER-OSPF uses a match ip address prefix-list ALLOWED. The prefix-list ALLOWED permits 10.0.0.0/8 le 24. However, a specific route 10.1.0.0/16 is not being redistributed. What is the root cause?
Quick Answer
The answer is a route-map match flow monitor statement that only matches NetFlow monitored traffic, not routing prefixes, causing the route to be denied. When troubleshooting route redistribution with NetFlow match, it is critical to understand that a match flow monitor condition in a route-map evaluates traffic flows, not routing table entries; therefore, a prefix like 10.1.0.0/16, which is permitted by the prefix-list ALLOWED (10.0.0.0/8 le 24), will still be filtered out because the route-map requires a NetFlow flow match that no route can satisfy. On the Cisco CCNP ENARSI 300-410 exam, this tests your ability to distinguish between route-map match clauses that apply to routing protocols versus those tied to Flexible NetFlow, a common trap where engineers focus only on prefix-length logic and overlook the flow monitor condition. Remember the memory tip: “Flow filters flows, not routes” — if you see match flow monitor in a redistribution route-map, the route will be denied regardless of prefix-list permissions.
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 route-map includes a match flow monitor statement that only matches NetFlow monitored traffic, not routing prefixes, causing the route to be denied.
The prefix-list permits 10.1.0.0/16 (le 24), so the route should match. However, the scenario states that Flexible NetFlow was configured, and the missing routes occur after that. The most likely cause is that the route-map inadvertently includes a `match flow monitor` statement (common when integrating NetFlow with routing). This statement only matches packets that are being monitored by a flow monitor, not routing prefixes. Therefore, the redistributed route is denied by the route-map's implied deny. The correct answer is B.
Key principle: Route-map with match flow monitor
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 prefix-list is misconfigured; it should be permit 10.0.0.0/8 le 16 to include /16 prefixes.
Why it's wrong here
le 24 includes /16, so that is not the issue.
- ✓
The route-map includes a match flow monitor statement that only matches NetFlow monitored traffic, not routing prefixes, causing the route to be denied.
Why this is correct
If the route-map uses match flow monitor, it will not match any route because routes are not flows. This is a common misconfiguration when combining NetFlow with route-maps.
Related concept
Route-map with match flow monitor
- ✗
The EIGRP metric is too high, causing the route to be suppressed.
Why it's wrong here
The metric is set, but that would not prevent redistribution; it would only affect the metric.
- ✗
The OSPF route is not in the routing table due to a missing network statement.
Why it's wrong here
The route exists in OSPF, as it is being redistributed, but the route-map is blocking it.
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
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Route-map with match flow monitor
- Flexible NetFlow interaction with route redistribution
TExam Day Tips
- 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
Route-map with match flow monitor
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
What to study next
Got this wrong? Here's your next step.
Review route-map with match flow monitor, then practise related 300-410 questions on the same topic to reinforce the concept.
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NetFlow and Flexible NetFlow — study guide chapter
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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 — Route-map with match flow monitor.
What is the correct answer to this question?
The correct answer is: The route-map includes a match flow monitor statement that only matches NetFlow monitored traffic, not routing prefixes, causing the route to be denied. — The prefix-list permits 10.1.0.0/16 (le 24), so the route should match. However, the scenario states that Flexible NetFlow was configured, and the missing routes occur after that. The most likely cause is that the route-map inadvertently includes a `match flow monitor` statement (common when integrating NetFlow with routing). This statement only matches packets that are being monitored by a flow monitor, not routing prefixes. Therefore, the redistributed route is denied by the route-map's implied deny. The correct answer is B.
What should I do if I get this 300-410 question wrong?
Review route-map with match flow monitor, then practise related 300-410 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Route-map with match flow monitor
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Last reviewed: Jun 19, 2026
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