300-410 Route Maps and Route Filtering Practice Question
This 300-410 practice question tests your understanding of route maps and route filtering. 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.
An engineer configures a BGP route reflector with a route map that sets a higher local preference on routes received from a client. The route map is applied to the neighbor statement for the client. Unexpectedly, the route reflector does not reflect the modified local preference to other clients. Which is the most likely explanation?
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.
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 applied outbound, not inbound, so the local preference is set after the route is reflected.
When a route map is applied to a BGP neighbor inbound, it modifies the route before it is installed in the BGP table. However, route reflectors reflect routes based on the best path selection, and if the local preference is set, it should be reflected. The issue is that the route map is applied outbound instead of inbound, or the route map does not explicitly set the local preference before the route is processed. The most common edge case is that the route map is applied outbound, which does not affect the route before reflection.
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 route map is applied outbound, not inbound, so the local preference is set after the route is reflected.
Why this is correct
Outbound route maps affect routes sent to the neighbor, not routes received; reflection happens before outbound processing.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Route reflectors do not modify local preference; only the route reflector itself can set local preference.
Why it's wrong here
Route reflectors can modify attributes via route maps.
✗
The route map must be applied to the route reflector's cluster list, not the neighbor.
Why it's wrong here
Route maps are applied to neighbors, not cluster lists.
✗
The local preference is overridden by the next-hop-self command.
Why it's wrong here
Next-hop-self does not affect local preference.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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.
Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The route map is applied outbound, not inbound, so the local preference is set after the route is reflected. — When a route map is applied to a BGP neighbor inbound, it modifies the route before it is installed in the BGP table. However, route reflectors reflect routes based on the best path selection, and if the local preference is set, it should be reflected. The issue is that the route map is applied outbound instead of inbound, or the route map does not explicitly set the local preference before the route is processed. The most common edge case is that the route map is applied outbound, which does not affect the route before reflection.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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