- A
The session is offloaded to the NPU and is not being sent to the IPS engine
In flow-based mode, sessions can be offloaded to hardware accelerators (NPU). When offloaded, the IPS engine does not inspect each packet; only session setup is checked. This is expected behavior for flow-based inspection.
- B
The antivirus profile is set to proxy-based, conflicting with flow-based IPS
Why wrong: Proxy-based and flow-based can coexist in a policy but inspection mode is per-session; flow-based would still inspect packets sent to CPU.
- C
The IPS profile is configured with 'monitor' mode instead of 'protect'
Why wrong: Monitor mode would still inspect packets, but would not block; the output would still show inspection happening.
- D
The traffic is UDP and flow-based inspection does not inspect UDP
Why wrong: Flow-based inspection can inspect UDP as well, though offloading may still occur.
Quick Answer
The answer is that the session is offloaded to the NPU and is not being sent to the IPS engine. In flow-based mode, FortiGate leverages its network processors to handle packet forwarding at wire speed, bypassing the CPU-based inspection engine for established sessions. When you see packets forwarded without inspection in the `diagnose ips packet-list` output, it confirms that the traffic is being processed by the NPU, which performs only essential checks and forwards the packets without deep content analysis. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this concept tests your understanding of how flow-based inspection differs from proxy-based inspection—specifically that non-TCP traffic or offloaded sessions skip the IPS engine entirely. A common trap is assuming all traffic is inspected equally, but flow-based mode prioritizes performance by offloading. Remember the mnemonic: "NPU offload means packets go, no IPS show."
NSE4 Security Profiles Practice Question
This NSE4 practice question tests your understanding of security profiles. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is configured with flow-based antivirus and an IPS profile on a policy. The administrator runs 'diagnose ips packet-list' and sees that packets are being forwarded without inspection. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer choices
Why each option matters
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 offloaded to the NPU and is not being sent to the IPS engine
Flow-based inspection offloads traffic to the network processor (NPU) for forwarding without sending all packets to the CPU for inspection. The IPS diagnostic output showing packets forwarded without inspection indicates flow-based mode is skipping inspection for non-TCP traffic or when a session is offloaded.
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 offloaded to the NPU and is not being sent to the IPS engine
Why this is correct
In flow-based mode, sessions can be offloaded to hardware accelerators (NPU). When offloaded, the IPS engine does not inspect each packet; only session setup is checked. This is expected behavior for flow-based inspection.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The antivirus profile is set to proxy-based, conflicting with flow-based IPS
Why it's wrong here
Proxy-based and flow-based can coexist in a policy but inspection mode is per-session; flow-based would still inspect packets sent to CPU.
- ✗
The IPS profile is configured with 'monitor' mode instead of 'protect'
Why it's wrong here
Monitor mode would still inspect packets, but would not block; the output would still show inspection happening.
- ✗
The traffic is UDP and flow-based inspection does not inspect UDP
Why it's wrong here
Flow-based inspection can inspect UDP as well, though offloading may still occur.
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
Monitor mode would still inspect packets, but would not block; the output would still show inspection happening.
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.
- →
Security Profiles — study guide chapter
Learn the concepts, then practise the questions
- →
Security Profiles practice questions
Targeted practice on this topic area only
- →
All NSE4 questions
1,000 questions across all exam domains
- →
Fortinet NSE 4 Network Security Professional NSE4 study guide
Full concept coverage aligned to exam objectives
- →
NSE4 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related NSE4 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
System and Network Administration practice questions
Practise NSE4 questions linked to System and Network Administration.
Firewall Policies and NAT practice questions
Practise NSE4 questions linked to Firewall Policies and NAT.
Authentication and VPN practice questions
Practise NSE4 questions linked to Authentication and VPN.
Security Profiles practice questions
Practise NSE4 questions linked to Security Profiles.
High Availability and Diagnostics practice questions
Practise NSE4 questions linked to High Availability and Diagnostics.
NSE4 fundamentals practice questions
Practise NSE4 questions linked to NSE4 fundamentals.
NSE4 scenario practice questions
Practise NSE4 questions linked to NSE4 scenario.
NSE4 troubleshooting practice questions
Practise NSE4 questions linked to NSE4 troubleshooting.
Practice this exam
Start a free NSE4 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this NSE4 question test?
Security Profiles — This question tests Security Profiles — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The session is offloaded to the NPU and is not being sent to the IPS engine — Flow-based inspection offloads traffic to the network processor (NPU) for forwarding without sending all packets to the CPU for inspection. The IPS diagnostic output showing packets forwarded without inspection indicates flow-based mode is skipping inspection for non-TCP traffic or when a session is offloaded.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 21, 2026
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
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.