The correct answer is the three commands: get router info bgp neighbors <neighbor> advertised-routes, get router info routing-table bgp, and diagnose ip router bgp all out. These three tools are essential for debugging BGP route not advertised issues because they form a logical troubleshooting chain: you first verify that the route actually exists in the local BGP table and routing table, then confirm what you are actually sending to the neighbor, and finally inspect the real-time BGP update process for errors or policy rejections. On the Fortinet NSE 7 Advanced Security NSE7 exam, this question tests your ability to isolate advertisement failures rather than just checking neighbor states or received prefixes—a common trap is choosing the “show summary” command, which only displays neighbor status, or the “received-routes” command, which shows inbound prefixes irrelevant to outbound advertisement. A reliable memory tip is to think “Route, Send, Debug”—first confirm the route exists, then check what you send, then debug the why.
NSE7 Troubleshooting and Diagnostics Practice Question
This NSE7 practice question tests your understanding of troubleshooting and diagnostics. 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.
You are troubleshooting BGP route advertisement issues. Which THREE debug commands would be useful to identify why a route is not being advertised to a neighbor? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
diagnose debug router bgp <neighbor>
Options B, C, and D are correct. Debug BGP (B) shows updates and errors. Show route (C) checks if route exists in table. Show advertised-routes (D) shows what is sent. Option A shows summary only. Option E shows received but not 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.
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
Shows received routes, not advertisement.
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 NSE7 OSPF questions on adjacency and route selection.
Troubleshooting and Diagnostics — This question tests Troubleshooting and Diagnostics — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: diagnose debug router bgp <neighbor> — Options B, C, and D are correct. Debug BGP (B) shows updates and errors. Show route (C) checks if route exists in table. Show advertised-routes (D) shows what is sent. Option A shows summary only. Option E shows received but not advertisement.
What should I do if I get this NSE7 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 NSE7 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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