This NSE4 practice question tests your understanding of firewall policies and nat. 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.
An administrator runs 'diagnose sys session filter dport 443' and sees the following output:
proto=6 proto_state=01 duration=3600 expire=3599
What does this indicate about the session?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The session has been active for 3600 seconds and will expire in 3599 seconds
The output shows 'duration=3600' and 'expire=3599', which directly indicate the session has been active for 3600 seconds (1 hour) and will expire in 3599 seconds. The 'proto=6' confirms TCP (protocol 6), and 'proto_state=01' indicates an established TCP session. This is a standard FortiGate session diagnostic display.
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.
✗
The session is experiencing packet loss
Why it's wrong here
The output does not indicate packet loss; proto_state=01 is normal.
The session has been active for 3600 seconds and will expire in 3599 seconds
Why this is correct
duration=3600 means 3600 seconds (1 hour) since session start. expire=3599 means the session will be removed in 3599 seconds unless refreshed.
Related concept
Read the scenario before looking for a memorised answer.
✗
The session is blocked by a firewall policy
Why it's wrong here
If blocked, there would be no session entry.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may misinterpret 'duration' and 'expire' as packet loss or blocking indicators, or confuse 'proto=6' with UDP, when in fact these fields simply show session age and remaining lifetime for an active TCP session.
Trap categories for this question
Command / output trap
The output does not indicate packet loss; proto_state=01 is normal.
Detailed technical explanation
How to think about this question
The 'diagnose sys session filter dport 443' command filters sessions by destination port 443 (HTTPS). The 'proto_state=01' for TCP corresponds to the 'established' state in the FortiGate session table, meaning the three-way handshake completed. The 'expire' timer decrements from the session timeout value (here 3600 seconds, likely the default TCP timeout) and resets with traffic; a value of 3599 indicates the session is idle and will be removed if no packets arrive before the timer reaches 0.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Firewall Policies and NAT — This question tests Firewall Policies and NAT — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The session has been active for 3600 seconds and will expire in 3599 seconds — The output shows 'duration=3600' and 'expire=3599', which directly indicate the session has been active for 3600 seconds (1 hour) and will expire in 3599 seconds. The 'proto=6' confirms TCP (protocol 6), and 'proto_state=01' indicates an established TCP session. This is a standard FortiGate session diagnostic display.
What should I do if I get this NSE4 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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