The answer is to verify that the BGP neighbor IP is reachable via the routing table. When a BGP neighbor state remains Idle despite correct configuration, it almost always signals that the underlying IP connectivity is broken—either the interface is down, a static route is missing, or the neighbor’s IP is not present in the routing table. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your ability to distinguish between configuration errors and Layer 3 reachability issues; a common trap is to immediately suspect BGP timers or authentication when the real culprit is a missing route. Remember that BGP will not even begin the OpenConfirm or Established process until it can successfully ping the neighbor’s update-source IP. A useful memory tip: “Idle means no path—check the route table first.”
NSE7 Troubleshooting and Diagnostics Practice Question
This NSE7 practice question tests your understanding of troubleshooting and diagnostics. 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.
A BGP peering between two FortiGates is not establishing. The administrator runs 'get router info bgp neighbor' and sees that the neighbor state is 'Idle' and the BGP configuration appears correct. What should the administrator check next?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify that the BGP neighbor IP is reachable via the routing table
Option D is correct. A neighbor state of 'Idle' often indicates that BGP is administratively disabled or there is a problem with the underlying connectivity. The most common cause is that the BGP neighbor is not reachable via a valid route or the interface is down. Checking the routing table and connectivity is the next step.
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.
✗
Run 'diagnose ip router bgp all enable' to enable debug
Why it's wrong here
Debug is helpful but not the next step; connectivity should be checked first.
✗
Check the BGP AS number configuration
Why it's wrong here
AS number mismatch would cause 'Active' or 'Connect' state, not 'Idle'.
✓
Verify that the BGP neighbor IP is reachable via the routing table
Why this is correct
If the neighbor is unreachable, BGP stays in Idle state.
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.
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: Verify that the BGP neighbor IP is reachable via the routing table — Option D is correct. A neighbor state of 'Idle' often indicates that BGP is administratively disabled or there is a problem with the underlying connectivity. The most common cause is that the BGP neighbor is not reachable via a valid route or the interface is down. Checking the routing table and connectivity is the next step.
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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