The answer is the `show ip bgp neighbors <neighbor> advertised-routes` command and the `show ip bgp <prefix>` command. These two commands are correct because `show ip bgp neighbors <neighbor> advertised-routes` directly lists every prefix being sent to a specific peer, while `show ip bgp <prefix>` displays the BGP table entry for a route, including an "advertised to" field that shows each neighbor the prefix has been sent to. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to distinguish between verification commands and operational or debug tools; a common trap is confusing `advertised-routes` with `routes`, which shows only received prefixes. To verify route advertisement to a neighbor, always think "outbound" for `advertised-routes` and "per-prefix detail" for `show ip bgp <prefix>`. A helpful memory tip is "AD for ADvertised" — use `advertised-routes` to see what you are sending out.
300-410 BGP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of bgp troubleshooting. 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 is troubleshooting a BGP route advertisement issue. Which TWO commands can be used to verify whether a prefix is being advertised to a specific BGP neighbor? (Choose TWO.)
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 <prefix>
To verify BGP advertisement to a neighbor, 'show ip bgp neighbors <neighbor> advertised-routes' shows all routes advertised to that neighbor. 'show ip bgp <prefix>' includes an entry for each neighbor the route is advertised to. 'show ip bgp neighbors <neighbor> routes' shows routes received from the neighbor, not advertised. 'debug ip bgp updates' is a debug command, not a verification command. 'show ip bgp summary' shows neighbor states and counts, not specific prefix advertisement.
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 neighbors <neighbor> routes
Why it's wrong here
Incorrect. This command shows routes received from the neighbor, not advertised.
✓
show ip bgp <prefix>
Why this is correct
Correct. This command displays the BGP entry for a prefix, including the neighbor(s) to which the route is advertised.
Incorrect. This is a debug command used for real-time troubleshooting, not for static verification.
✗
show ip bgp summary
Why it's wrong here
Incorrect. This command shows BGP neighbor states and prefix counts, not which specific prefixes are advertised.
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 command shows routes received from the neighbor, not advertised.
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: show ip bgp <prefix> — To verify BGP advertisement to a neighbor, 'show ip bgp neighbors <neighbor> advertised-routes' shows all routes advertised to that neighbor. 'show ip bgp <prefix>' includes an entry for each neighbor the route is advertised to. 'show ip bgp neighbors <neighbor> routes' shows routes received from the neighbor, not advertised. 'debug ip bgp updates' is a debug command, not a verification command. 'show ip bgp summary' shows neighbor states and counts, not specific prefix advertisement.
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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