- A
The route-map is applied inbound on R1, but it should be applied outbound to affect the local preference on routes sent to R2.
Inbound route-maps affect routes received from the neighbor; outbound affects routes sent. To set local preference on routes advertised to R2, the route-map must be applied outbound.
- B
The local-preference value of 150 is not high enough; it should be at least 200 to override the path from R3.
Why wrong: Local preference 150 is higher than 100, so it should be preferred; the issue is that the value is not being applied to the advertised route.
- C
R2 has a route-map that sets local preference to 100 for all routes, overriding the value set by R1.
Why wrong: No such route-map is mentioned; the scenario focuses on R1's configuration.
- D
The prefix 10.10.0.0/16 is not in the BGP table of R1 because it is not originated or learned.
Why wrong: R1 is advertising the prefix, so it must be in its BGP table.
300-410 Device Management Practice Question
This 300-410 practice question tests your understanding of device management. 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 BGP speaker R1 is advertising a prefix 10.10.0.0/16 to its eBGP neighbor R2. R2 is also receiving the same prefix from another eBGP neighbor R3 with a lower local preference. R1 configuration: router bgp 100, neighbor 192.168.1.2 remote-as 200, neighbor 192.168.1.2 route-map SET-LP in. Route-map SET-LP sets local-preference 150. R2 shows: 'show ip bgp 10.10.0.0/16' shows two paths: one from R1 with local pref 150, and one from R3 with local pref 100. The best path is via R3. Why is the path from R1 not selected?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 is applied inbound on R1, but it should be applied outbound to affect the local preference on routes sent to R2.
The route-map SET-LP is applied in the inbound direction on R1, meaning it sets local preference on routes received from R2, not on routes sent to R2. R1 should apply the route-map outbound to affect the local preference on R2. Since the local preference is set incorrectly, R2 prefers the path from R3 due to lower local preference (100 vs 150, but note: higher local preference is preferred, so 150 should win; however, the issue is that the local preference is not being set on the advertised route, so R2 sees default local pref 100 from R1, and 150 from R3, so R3 wins). The root cause is the route-map direction.
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 inbound on R1, but it should be applied outbound to affect the local preference on routes sent to R2.
Why this is correct
Inbound route-maps affect routes received from the neighbor; outbound affects routes sent. To set local preference on routes advertised to R2, the route-map must be applied outbound.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The local-preference value of 150 is not high enough; it should be at least 200 to override the path from R3.
Why it's wrong here
Local preference 150 is higher than 100, so it should be preferred; the issue is that the value is not being applied to the advertised route.
- ✗
R2 has a route-map that sets local preference to 100 for all routes, overriding the value set by R1.
Why it's wrong here
No such route-map is mentioned; the scenario focuses on R1's configuration.
- ✗
The prefix 10.10.0.0/16 is not in the BGP table of R1 because it is not originated or learned.
Why it's wrong here
R1 is advertising the prefix, so it must be in its BGP table.
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.
Trap categories for this question
Scenario analysis trap
No such route-map is mentioned; the scenario focuses on R1's configuration.
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?
Device Management — This question tests Device Management — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The route-map is applied inbound on R1, but it should be applied outbound to affect the local preference on routes sent to R2. — The route-map SET-LP is applied in the inbound direction on R1, meaning it sets local preference on routes received from R2, not on routes sent to R2. R1 should apply the route-map outbound to affect the local preference on R2. Since the local preference is set incorrectly, R2 prefers the path from R3 due to lower local preference (100 vs 150, but note: higher local preference is preferred, so 150 should win; however, the issue is that the local preference is not being set on the advertised route, so R2 sees default local pref 100 from R1, and 150 from R3, so R3 wins). The root cause is the route-map direction.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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