Quick Answer
The answer is that the route map is missing a 'set' action, which causes it to deny all routes by default. In FortiGate OSPF redistribution, a route map that only uses a prefix list to match routes but lacks a 'set' statement—such as 'set metric' or 'set tag'—implicitly denies those matched routes, preventing them from being redistributed. This is because FortiGate treats a route map without a 'set' action as a deny filter, even if the prefix list matches correctly. On the Fortinet NSE 7 Advanced Security NSE7 exam, this concept tests your understanding of how route map redistribution interacts with OSPF, often appearing as a common trap where candidates assume matching alone is sufficient. A helpful memory tip is: "Match without set is a net that catches nothing—always set to inject."
This NSE7 practice question tests your understanding of advanced networking and sd-wan. 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.
An administrator configures a route map to control redistribution of connected routes into OSPF. The route map uses a prefix list to match routes. After applying the redistribution, no routes are redistributed. What is the most likely oversight?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The route map is missing a 'set' action, so it denies all routes
Without set, route map denies by default.
The prefix list is configured with the wrong sequence number
Why wrong: Sequence matters but usually would not prevent all routes.
OSPF process ID is incorrect
Why wrong: Would not affect route map application.
The connected routes are not in the routing table
Why wrong: If they exist, redistribution should work.
Answer choices
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 is missing a 'set' action, so it denies all routes
The route map must have a 'set' action or at least 'set metric' to actually redistribute. If the route map only matches but has no set statement, the routes are not injected. Also, the route map must be applied to the redistribution statement.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The route map is missing a 'set' action, so it denies all routes
Why this is correct
Without set, route map denies by default.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
The prefix list is configured with the wrong sequence number
Why it's wrong here
Sequence matters but usually would not prevent all routes.
OSPF process ID is incorrect
Why it's wrong here
Would not affect route map application.
The connected routes are not in the routing table
Why it's wrong here
If they exist, redistribution should work.
Common exam traps
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
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.
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
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
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 NSE7 OSPF questions on adjacency and route selection.
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FAQ
Advanced Networking and SD-WAN — This question tests Advanced Networking and SD-WAN — OSPF neighbours must agree on key parameters..
The correct answer is: The route map is missing a 'set' action, so it denies all routes — The route map must have a 'set' action or at least 'set metric' to actually redistribute. If the route map only matches but has no set statement, the routes are not injected. Also, the route map must be applied to the redistribution statement.
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 NSE7 OSPF questions on adjacency and route selection.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
OSPF neighbours must agree on key parameters.
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An administrator configures a route map on a FortiGate to redistribute connected routes into OSPF. The route map sets a metric of 100. After applying, the redistributed routes appear with metric 20. What is the most likely reason?
mediumWhy C: When redistributing into OSPF, the metric type can be set to type 1 or type 2. Type 2 (default) does not add internal cost, but the metric set in the route map should still apply. However, if the route map is not applied correctly or OSPF's default metric (20 for redistributed routes) overrides, the route map might be misconfigured. Option D is correct: the route map might not be applied to redistribution.
Variation 2. An administrator configures a route-map to match prefix-list 'PREFIX' and set metric 20. Which OSPF route redistribution uses this route-map correctly?
mediumLast reviewed: Jun 21, 2026
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