- 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.
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.
300-410 NetFlow and Flexible NetFlow Practice Question
This 300-410 practice question tests your understanding of netflow and flexible netflow. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 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?
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 10.0.0.0/8 le 24, meaning it allows prefixes with a length up to /24. The route 10.1.0.0/16 has a prefix length of /16, which is less than 24, so it should be permitted. However, the issue may be that the route-map also has a match statement for a flow monitor or NetFlow parameters that inadvertently filter the route. Alternatively, the redistribution may be affected by the order of operations: the route-map is applied to redistribution, but if the route-map also references a flow monitor (e.g., match flow monitor), it will not match routes. The correct answer is that the route-map includes a match flow monitor statement that only matches traffic flows, not routes, causing the route to be denied.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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
OSPF neighbours must agree on key parameters.
- ✗
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: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
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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 — OSPF neighbours must agree on key parameters..
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 10.0.0.0/8 le 24, meaning it allows prefixes with a length up to /24. The route 10.1.0.0/16 has a prefix length of /16, which is less than 24, so it should be permitted. However, the issue may be that the route-map also has a match statement for a flow monitor or NetFlow parameters that inadvertently filter the route. Alternatively, the redistribution may be affected by the order of operations: the route-map is applied to redistribution, but if the route-map also references a flow monitor (e.g., match flow monitor), it will not match routes. The correct answer is that the route-map includes a match flow monitor statement that only matches traffic flows, not routes, causing the route to be denied.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 19, 2026
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