The answer is to use the commands diagnose sys session filter state syn-sent followed by diagnose sys session list. This combination works because the filter narrows the session table to only those TCP connections stuck in the initial handshake state—syn-sent—which are the classic sign of incomplete sessions that waste table resources. The list command then displays those filtered sessions, allowing you to see source and destination details. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this question tests your ability to diagnose session table exhaustion, a common performance issue. A frequent trap is confusing the session list with the sniffer or debug flow commands, which show packet-level data rather than session state. Remember the memory tip: “Filter the state, then list the fate”—meaning you must set the state filter before you can list the stuck sessions.
NSE4 High Availability and Diagnostics Practice Question
This NSE4 practice question tests your understanding of high availability 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.
A FortiGate administrator is investigating a performance issue and suspects that a large number of incomplete TCP connections are consuming session table resources. Which TWO commands would help identify such sessions? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
diagnose sys session stat
Diagnose sys session list with filter can show sessions by state. Diagnose sys session stat shows counts by state. The sniffer shows packets, not session state; debug flow is for tracing specific streams.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Flow debug is for tracing specific traffic, not aggregate session analysis.
✓
diagnose sys session stat
Why this is correct
Shows counts of sessions by state, including incomplete states.
Related concept
Read the scenario before looking for a memorised answer.
✗
diagnose sniffer packet any 'tcp' 4
Why it's wrong here
Packet capture shows packets, not session table entries.
✓
diagnose sys session filter state syn-sent ; diagnose sys session list
Why this is correct
Filters sessions in SYN-SENT state, indicating incomplete connections.
Related concept
Read the scenario before looking for a memorised answer.
✗
diagnose sys session filter proto 6 ; diagnose sys session list
Why it's wrong here
Filters all TCP sessions, not specifically incomplete ones.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
Packet capture shows packets, not session table entries.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the NSE4 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
Got this wrong? Here's your next step.
Identify which NSE4 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.
High Availability and Diagnostics — This question tests High Availability and Diagnostics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: diagnose sys session stat — Diagnose sys session list with filter can show sessions by state. Diagnose sys session stat shows counts by state. The sniffer shows packets, not session state; debug flow is for tracing specific streams.
What should I do if I get this NSE4 question wrong?
Identify which NSE4 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This NSE4 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 NSE4 exam.
Question Discussion
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