Quick Answer
The answer is the diagnose ip router bgp routes command. This command is the correct tool because it displays the full BGP route table with the specific reason a route is marked as valid but not best, such as a lower weight, shorter local preference, longer AS path, or higher MED value. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your ability to troubleshoot BGP path selection when a session is up but routes fail to install in the routing table. A common trap is to use get router info bgp network, which only shows the BGP table without the tie-breaking diagnostics. The key distinction is that diagnose ip router bgp routes reveals the exact “not best” cause, while show ip bgp simply confirms the route exists. Remember the mnemonic: “Diagnose digs deeper” — when a route is valid but not best, you need the diagnostic depth to find why.
This NSE7 practice question tests your understanding of troubleshooting and diagnostics. 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.
A BGP route from an ISP is not appearing in the FortiGate's routing table. The BGP session is established and 'show ip bgp' shows the route as valid but not best. Which command should the admin use to investigate why the route is not selected as best?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
execute router bgp show
Why wrong: This is not a valid FortiGate command.
diagnose ip router bgp routes
This command shows BGP route details and best path selection reasons.
get router info bgp summary
Why wrong: This shows BGP session status, not route selection.
diagnose ip router bgp network
Why wrong: This command is not valid.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
diagnose ip router bgp routes
The 'diagnose ip router bgp routes' command provides detailed BGP route information, including the reason why a route is not best (e.g., weight, local preference, AS path, MED). Option A is correct.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
execute router bgp show
Why it's wrong here
This is not a valid FortiGate command.
diagnose ip router bgp routes
get router info bgp summary
Why it's wrong here
This shows BGP session status, not route selection.
diagnose ip router bgp network
Why it's wrong here
This command is not valid.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
This is not a valid FortiGate command.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related NSE7 NAT questions on configuration and troubleshooting.
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FAQ
Troubleshooting and Diagnostics — This question tests Troubleshooting and Diagnostics — Static NAT maps one inside address to one outside address..
The correct answer is: diagnose ip router bgp routes — The 'diagnose ip router bgp routes' command provides detailed BGP route information, including the reason why a route is not best (e.g., weight, local preference, AS path, MED). Option A is correct.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related NSE7 NAT questions on configuration and troubleshooting.
Yes — watch for: "best", "which command". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
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