The answer is that all routes received from neighbor 10.5.5.6 have their local preference set to 150, making them more preferred within the local AS. This occurs because the route-map SET-LP is applied inbound, and the set local-preference 150 command overrides the default value of 100 for every route entering R5 from that neighbor. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding of BGP path selection and the critical distinction between inbound and outbound route-map application. A common trap is confusing inbound local-preference manipulation with outbound MED or weight changes; remember that local preference is only meaningful within the local AS and is set on inbound updates. The key memory tip is “LP in = local win,” meaning setting local preference inbound makes the routes more attractive inside your own AS, influencing all routers in that AS to prefer that path.
300-410 BGP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of bgp troubleshooting. 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.
Consider the following BGP configuration on router R5:
router bgp 65005
bgp router-id 5.5.5.5
neighbor 10.5.5.6 remote-as 65006
neighbor 10.5.5.6 route-map SET-LP in
!
route-map SET-LP permit 10
set local-preference 150
!
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
All routes from 10.5.5.6 have their local preference set to 150, making them more preferred.
The route-map SET-LP is applied inbound. It sets the local preference to 150 for all routes received from 10.5.5.6. This makes those routes more preferred within the local AS compared to routes with default local preference (100).
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.
✓
All routes from 10.5.5.6 have their local preference set to 150, making them more preferred.
Why this is correct
The route-map matches all routes (no match condition) and sets local-preference to 150.
Only routes that match a prefix-list are affected; otherwise, default local preference is used.
Why it's wrong here
There is no match condition, so all routes are matched.
✗
Local preference is set to 150 for routes sent to 10.5.5.6.
Why it's wrong here
The keyword 'in' means it is applied to inbound updates.
✗
The route-map is ignored because local-preference can only be set outbound.
Why it's wrong here
Local-preference can be set inbound to influence route selection within the local AS.
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
Keyword trap
The keyword 'in' means it is applied to inbound updates.
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.
BGP Troubleshooting — This question tests BGP Troubleshooting — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: All routes from 10.5.5.6 have their local preference set to 150, making them more preferred. — The route-map SET-LP is applied inbound. It sets the local preference to 150 for all routes received from 10.5.5.6. This makes those routes more preferred within the local AS compared to routes with default local preference (100).
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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