Quick Answer
The answer is Full SSL Inspection (Deep Inspection). This is the correct choice because it performs a man-in-the-middle decryption and re-encryption of all HTTPS traffic, allowing the FortiGate to inspect the payload of encrypted sessions regardless of the port used, including non-standard ports. On the Fortinet NSE 4 Network Security Professional exam, this concept tests your understanding of how Deep Inspection differs from certificate-based inspection, which only works on port 443; a common trap is assuming that simply enabling SSL inspection on a firewall policy will catch traffic on arbitrary ports like 8443 or 8080. Remember that Full SSL Inspection is the only method that can decrypt and inspect encrypted sessions on any port, making it essential for catching threats hidden in non-standard applications. A helpful memory tip: “Full = all ports, all payloads; Certificate = port 443 only.”
This NSE4 practice question tests your understanding of security profiles. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
When configuring SSL inspection, which type of inspection decrypts and inspects all HTTPS traffic including applications using non-standard ports?
SSL Offloading
Why wrong: SSL offloading is a different concept for load balancers.
Certificate Inspection
Why wrong: Certificate inspection only checks the certificate, not the content.
Full SSL Inspection (Deep Inspection)
Deep inspection decrypts and inspects all traffic.
Flow-based Inspection
Why wrong: Flow-based inspection is a mode, not a type of SSL inspection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Full SSL Inspection (Deep Inspection)
Full SSL Inspection (Deep Inspection) is the correct answer because it performs a man-in-the-middle decryption and re-encryption of all HTTPS traffic, regardless of the port used. This allows the FortiGate to inspect the payload of encrypted sessions, including those on non-standard ports, for threats and policy violations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
SSL Offloading
Why it's wrong here
SSL offloading is a different concept for load balancers.
Certificate Inspection
Why it's wrong here
Certificate inspection only checks the certificate, not the content.
Full SSL Inspection (Deep Inspection)
Why this is correct
Deep inspection decrypts and inspects all traffic.
Related concept
Read the scenario before looking for a memorised answer.
Flow-based Inspection
Why it's wrong here
Flow-based inspection is a mode, not a type of SSL inspection.
Common exam traps
The trap here is confusing the processing mode (Flow-based vs. Proxy-based) with the actual SSL inspection method, leading candidates to incorrectly select Flow-based Inspection as a type of SSL decryption.
Detailed technical explanation
Full SSL Inspection works by intercepting the TLS handshake, presenting a FortiGate-generated certificate to the client, and then establishing a separate TLS session with the server. This allows the FortiGate to inspect the decrypted traffic for signatures, malware, and data leakage. A subtle behavior is that this inspection can break applications using certificate pinning, requiring the administrator to exempt such traffic or install the FortiGate CA certificate on clients.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Profiles — study guide chapter
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FAQ
Security Profiles — This question tests Security Profiles — Read the scenario before looking for a memorised answer..
The correct answer is: Full SSL Inspection (Deep Inspection) — Full SSL Inspection (Deep Inspection) is the correct answer because it performs a man-in-the-middle decryption and re-encryption of all HTTPS traffic, regardless of the port used. This allows the FortiGate to inspect the payload of encrypted sessions, including those on non-standard ports, for threats and policy violations.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 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.
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