Quick Answer
The answer is `diagnose debug application sip -1`. This command is correct because it enables real-time SIP ALG debugging on a FortiGate, allowing you to see exactly how the ALG processes and modifies SIP headers, including any incorrect translations that could break call signaling. On the Fortinet NSE 7 Advanced Security NSE7 exam, this question tests your ability to isolate ALG-related issues in VoIP environments, a common scenario where the ALG’s SIP helper can inadvertently alter contact headers or SDP payloads. A frequent trap is confusing this with `diagnose debug flow` or `diagnose sniffer packet`, which show network traffic but not the ALG’s internal SIP-specific transformations. Remember, the `-1` flag sets the debug level to maximum verbosity, so you see every SIP message the ALG touches. A useful memory tip: think “SIP minus one” as “SIP minus the guesswork” — it strips away the mystery of what the ALG is doing to your packets.
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.
An administrator configures an ALG for SIP traffic but notices that some SIP calls are failing. The admin suspects the ALG is modifying SIP headers incorrectly. Which debug command can help verify the ALG's actions on SIP packets?
diagnose debug application sip -1
This enables detailed SIP ALG debug output.
diagnose debug application alg -1
Why wrong: There is no generic 'alg' debug; each ALG has its own application name.
get system performance status
Why wrong: This shows system health, not ALG behavior.
diagnose sys session filter proto 17
Why wrong: This filters sessions but does not show ALG processing.
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 debug application sip -1
'diagnose debug application sip -1' enables SIP ALG debugging, showing how the ALG processes SIP messages.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
diagnose debug application sip -1
Why this is correct
This enables detailed SIP ALG debug output.
Related concept
Read the scenario before looking for a memorised answer.
diagnose debug application alg -1
Why it's wrong here
There is no generic 'alg' debug; each ALG has its own application name.
get system performance status
Why it's wrong here
This shows system health, not ALG behavior.
diagnose sys session filter proto 17
Why it's wrong here
This filters sessions but does not show ALG processing.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
This shows system health, not ALG behavior.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the NSE7 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which NSE7 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Troubleshooting and Diagnostics — This question tests Troubleshooting and Diagnostics — Read the scenario before looking for a memorised answer..
The correct answer is: diagnose debug application sip -1 — 'diagnose debug application sip -1' enables SIP ALG debugging, showing how the ALG processes SIP messages.
Identify which NSE7 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 21, 2026
This NSE7 practice question is part of Courseiva's free Fortinet certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the NSE7 exam.
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