The answer is that the session output indicates an established TCP session for HTTPS traffic. This is correct because `proto=6` corresponds to TCP in the IP protocol number mapping, while `proto_state=01` specifically signifies a fully established TCP connection, and `dport=443` confirms the destination port for HTTPS. The `duration` and `expire` values further show the session has been active for 3600 seconds with 3599 seconds remaining, confirming it is live and not in a handshake or closing state. On the Fortinet NSE 4 exam, this command tests your ability to interpret real-time session diagnostics, a core skill for troubleshooting firewall policies and traffic flows. A common trap is confusing `proto_state=01` with a SYN-SENT or TIME_WAIT state, but remember that state 01 always means established in FortiOS session output. Memory tip: think of “01” as the number one connection—fully up and running.
NSE4 System and Network Administration Practice Question
This NSE4 practice question tests your understanding of system and network administration. 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 admin 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?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The session is an established TCP session for HTTPS traffic
The output shows `proto=6` (TCP), `proto_state=01` (TCP established), `dport=443` (HTTPS), and a duration/expire indicating an active session. This confirms an established TCP session for HTTPS traffic, making D correct.
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 a half-open TCP connection
Why it's wrong here
Half-open connections have proto_state=00 or other values indicating SYN received.
✗
The session is a multicast session
Why it's wrong here
Multicast uses UDP and different protocols; this is TCP.
The session is an established TCP session for HTTPS traffic
Why this is correct
Proto=6 is TCP, proto_state=01 means established, and dport 443 is HTTPS.
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 misinterpret `proto_state=01` as a half-open connection (like SYN_SENT) because they confuse the numeric state value with TCP flags, when in fact 01 specifically means ESTABLISHED in FortiGate's session table.
Detailed technical explanation
How to think about this question
In FortiGate session diagnostics, `proto=6` corresponds to TCP (per IANA protocol numbers), and `proto_state=01` maps to the TCP state ESTABLISHED (0x01). The `dport=443` indicates HTTPS traffic, which uses TCP. The `expire=3599` seconds shows the session is still active with a typical TCP timeout. This command is useful for verifying that HTTPS sessions are properly tracked and not stuck in intermediate states like SYN_SENT or FIN_WAIT.
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.
System and Network Administration — This question tests System and Network Administration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The session is an established TCP session for HTTPS traffic — The output shows `proto=6` (TCP), `proto_state=01` (TCP established), `dport=443` (HTTPS), and a duration/expire indicating an active session. This confirms an established TCP session for HTTPS traffic, making D correct.
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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