- A
show ip bgp neighbor X.X.X.X advertised-routes
Correct. This shows the routes actually advertised to the neighbor, reflecting the outbound route-map filtering.
- B
show route-map
Correct. This displays the route-map sequences, match/set conditions, and hit counts, helping verify if routes are being matched.
- C
show ip bgp
Correct. The BGP table shows all routes, including those that might be filtered; you can compare with advertised routes to see filtering effect.
- D
show ip bgp neighbors
Why wrong: Incorrect. This shows neighbor status and capabilities, but not the filtered routes or route-map application details.
- E
show ip prefix-list
Why wrong: Incorrect. This shows the prefix-list entries but does not show how they are used in a route-map or the filtering results.
300-410 Route Maps and Route Filtering Practice Question
This 300-410 practice question tests your understanding of route maps and route filtering. 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.
Which THREE commands can be used to verify the effects of a route-map applied to a BGP neighbor for outbound route filtering? (Choose THREE.)
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
show ip bgp neighbor X.X.X.X advertised-routes
To verify outbound route-map filtering on a BGP neighbor, you can check the route-map itself, the BGP table for routes that should be filtered, and the neighbor's advertised routes. show ip bgp neighbor advertised-routes shows what the router is actually sending. show route-map displays the route-map configuration and match counts. show ip bgp shows the BGP table with path attributes. show ip bgp neighbors displays neighbor information but not the filtered routes. show ip prefix-list shows prefix-list entries but not the route-map application.
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.
- ✓
show ip bgp neighbor X.X.X.X advertised-routes
Why this is correct
Correct. This shows the routes actually advertised to the neighbor, reflecting the outbound route-map filtering.
Related concept
OSPF neighbours must agree on key parameters.
- ✓
show route-map
Why this is correct
Correct. This displays the route-map sequences, match/set conditions, and hit counts, helping verify if routes are being matched.
Related concept
OSPF neighbours must agree on key parameters.
- ✓
show ip bgp
- ✗
show ip bgp neighbors
Why it's wrong here
Incorrect. This shows neighbor status and capabilities, but not the filtered routes or route-map application details.
- ✗
show ip prefix-list
Why it's wrong here
Incorrect. This shows the prefix-list entries but does not show how they are used in a route-map or the filtering results.
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
Command / output trap
Incorrect. This shows neighbor status and capabilities, but not the filtered routes or route-map application details.
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?
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: show ip bgp neighbor X.X.X.X advertised-routes — To verify outbound route-map filtering on a BGP neighbor, you can check the route-map itself, the BGP table for routes that should be filtered, and the neighbor's advertised routes. show ip bgp neighbor advertised-routes shows what the router is actually sending. show route-map displays the route-map configuration and match counts. show ip bgp shows the BGP table with path attributes. show ip bgp neighbors displays neighbor information but not the filtered routes. show ip prefix-list shows prefix-list entries but not the route-map application.
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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Last reviewed: Jun 18, 2026
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