- 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. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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?
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 inbound on R1 (neighbor 192.168.1.2 route-map SET-LP in), which means it sets local preference on routes received from R2, not on routes sent to R2. Local preference is a BGP attribute that is propagated only to iBGP peers and is not exchanged between eBGP peers. To influence R2's best path selection, the route-map must be applied outbound on R1 (neighbor 192.168.1.2 route-map SET-LP out) so that the local-preference value is set on the update sent to R2. Since R1 sets local preference inbound, R2 never receives the modified value, and R2's best path selection defaults to the path from R3 with local preference 100, which is the only local preference R2 sees from R1 (default 100).
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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: answer the scenario, not the keyword
Cisco often tests the distinction between inbound and outbound route-map application on eBGP peers, specifically that local preference set inbound affects the local router's decision but is not sent to the neighbor, leading candidates to mistakenly think the neighbor will see the modified value.
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
Local preference is a well-known mandatory BGP attribute that is propagated only within an AS (iBGP) and is not included in eBGP updates unless explicitly set using an outbound route-map on the eBGP speaker. When a route-map is applied inbound on an eBGP peer, it modifies attributes after the update is received, which affects the local router's best path but does not change the attribute value sent to the neighbor. In real-world scenarios, service providers often use outbound route-maps on eBGP links to influence a customer's inbound traffic by setting local preference, but this requires the customer to honor the attribute (which they typically do not, as local preference is locally significant).
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Management — This question tests Device Management — Read the scenario before looking for a memorised answer..
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 inbound on R1 (neighbor 192.168.1.2 route-map SET-LP in), which means it sets local preference on routes received from R2, not on routes sent to R2. Local preference is a BGP attribute that is propagated only to iBGP peers and is not exchanged between eBGP peers. To influence R2's best path selection, the route-map must be applied outbound on R1 (neighbor 192.168.1.2 route-map SET-LP out) so that the local-preference value is set on the update sent to R2. Since R1 sets local preference inbound, R2 never receives the modified value, and R2's best path selection defaults to the path from R3 with local preference 100, which is the only local preference R2 sees from R1 (default 100).
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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