NSE7 Enterprise Firewall and VDOMs Practice Question
This NSE7 practice question tests your understanding of enterprise firewall and vdoms. 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 FortiGate administrator runs the following command and sees the output:
diagnose sys session filter dport 443
diagnose sys session list
Output shows sessions with proto=6 and expire time decreasing. What does this indicate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The sessions are TCP sessions and are active
The command 'diagnose sys session filter dport 443' filters sessions with destination port 443, and 'diagnose sys session list' displays them. The output shows 'proto=6', which is the protocol number for TCP (per IANA protocol numbers). The 'expire time decreasing' indicates that the session timer is counting down, which is normal behavior for an active TCP session that is being refreshed by ongoing traffic. Therefore, the sessions are TCP and active.
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 FortiGate is performing deep packet inspection on these sessions
Why it's wrong here
The output does not indicate inspection; it only shows session details.
✗
The sessions are being blocked by a firewall policy
Why it's wrong here
Blocked sessions would not appear in the session list.
✓
The sessions are TCP sessions and are active
Why this is correct
proto=6 indicates TCP. The sessions are listed, meaning they are active and being tracked.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'expire time decreasing' with a session being blocked or expiring, when in fact it is a normal indicator of an active TCP session that is being refreshed by traffic.
Trap categories for this question
Command / output trap
The output does not indicate inspection; it only shows session details.
Detailed technical explanation
How to think about this question
The 'diagnose sys session list' command displays the kernel session table, where each session has a 'proto' field indicating the IP protocol number (e.g., 6 for TCP, 17 for UDP). The 'expire' timer for TCP sessions is typically set to 3600 seconds (1 hour) by default and decrements in real-time; it resets to the timeout value each time matching traffic is seen. In contrast, UDP sessions have a shorter timeout (e.g., 180 seconds) and are not tracked with the same stateful mechanism as TCP.
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 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
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.
Enterprise Firewall and VDOMs — This question tests Enterprise Firewall and VDOMs — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The sessions are TCP sessions and are active — The command 'diagnose sys session filter dport 443' filters sessions with destination port 443, and 'diagnose sys session list' displays them. The output shows 'proto=6', which is the protocol number for TCP (per IANA protocol numbers). The 'expire time decreasing' indicates that the session timer is counting down, which is normal behavior for an active TCP session that is being refreshed by ongoing traffic. Therefore, the sessions are TCP and active.
What should I do if I get this NSE7 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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