The correct answer is enabling the HTTP protocol decoder and, if HTTPS traffic is involved, enabling SSL deep inspection on the firewall policy. The IPS engine relies on protocol decoders to parse application-layer traffic; for HTTP, the decoder must be explicitly enabled on the IPS sensor so it can inspect the payload for exploits. However, if the web server traffic is encrypted via HTTPS, the decoder cannot read the payload unless SSL deep inspection is first configured to decrypt the traffic, allowing the HTTP decoder to analyze the plaintext. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this question tests your understanding that IPS decoders are protocol-specific and that decryption is a prerequisite for inspecting encrypted traffic—a common trap is assuming the decoder alone handles HTTPS. Remember the memory tip: “Decode first, decrypt if secure” to recall that HTTP decoders need the traffic unencrypted, so SSL inspection must precede decoding.
NSE4 Security Profiles Practice Question
This NSE4 practice question tests your understanding of security profiles. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 configuring IPS to protect against a known exploit targeting a web server. The administrator wants to ensure that the IPS engine can decode the HTTP protocol. Which TWO actions are necessary?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable the HTTP protocol decoder in the IPS sensor
IPS protocol decoders are enabled per protocol. For HTTP, you need to enable the HTTP decoder. Additionally, if the traffic is HTTPS, SSL deep inspection must be enabled to decrypt the traffic so the decoder can analyze it.
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.
✓
Enable the HTTP protocol decoder in the IPS sensor
Why this is correct
The decoder must be enabled for the engine to parse HTTP traffic.
Related concept
Read the scenario before looking for a memorised answer.
If traffic is HTTPS, deep inspection is required to decrypt and allow the HTTP decoder to inspect the content.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set the IPS action to 'block'
Why it's wrong here
Action 'block' is for when a signature matches, not for enabling protocol decoding.
✗
Disable the FTP protocol decoder
Why it's wrong here
Disabling other decoders is not necessary for HTTP inspection.
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.
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 — 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: Enable the HTTP protocol decoder in the IPS sensor — IPS protocol decoders are enabled per protocol. For HTTP, you need to enable the HTTP decoder. Additionally, if the traffic is HTTPS, SSL deep inspection must be enabled to decrypt the traffic so the decoder can analyze it.
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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