The answer is a firewall policy with the destination set to the VIP and an application control profile applied. This configuration is necessary because the Virtual IP (VIP) translates the public destination address to the web server’s private IP, allowing inbound HTTPS traffic to reach the internal server, while the application control profile on the same policy enforces the blocking of specific web applications within that traffic. On the Fortinet NSE 4 Network Security Professional exam, this scenario tests your understanding of how VIPs and application control profiles must be combined in a single firewall policy—not separate policies—to inspect and filter application-layer traffic. A common trap is assuming a VIP alone handles security or that application control can be applied on a different policy; in reality, both components must coexist on the same rule for the profile to inspect the decrypted HTTPS stream. Memory tip: think “VIP maps the address, App Control polices the payload—same policy, same flow.”
NSE4 Firewall Policies and NAT Practice Question
This NSE4 practice question tests your understanding of firewall policies and nat. 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 admin needs to allow inbound HTTPS traffic to a web server while also applying an application control profile to block certain web applications. The web server has a VIP configured. Which TWO components are necessary for this configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A VIP configured to map the public IP to the web server's private IP
Option B is correct because a Virtual IP (VIP) is required to map the public IP address to the web server's private IP, allowing inbound traffic to reach the internal server. Option E is correct because a firewall policy must have the destination set to the VIP and must include an application control profile to enforce blocking of specific web applications on the HTTPS traffic.
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.
✗
A central SNAT rule to translate the server's response
Why it's wrong here
The VIP handles both inbound and outbound translation automatically.
✓
A VIP configured to map the public IP to the web server's private IP
Why this is correct
The VIP is required for destination NAT to reach the internal server.
Related concept
Read the scenario before looking for a memorised answer.
✗
A security profile group containing only the antivirus profile
Why it's wrong here
Antivirus is not mentioned; application control is needed, not antivirus.
✗
A traffic shaping policy to prioritize HTTPS
Why it's wrong here
Traffic shaping is optional and not required for application control.
✓
A firewall policy with destination set to the VIP and application control profile applied
Why this is correct
The policy matches traffic destined to the VIP and applies the profile.
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 often think a central SNAT rule is required for return traffic, but FortiGate automatically handles reverse NAT for VIP traffic, making option A a common distractor.
Detailed technical explanation
How to think about this question
When a VIP is configured, FortiGate performs destination NAT (DNAT) to translate the public IP to the private IP of the web server. For the return traffic, FortiGate automatically performs source NAT (SNAT) to translate the server's private IP back to the VIP's public IP, ensuring asymmetric routing is handled correctly. Application control profiles inspect application-layer traffic (e.g., HTTP/HTTPS) and can block specific web applications based on signatures, which is independent of traffic shaping or antivirus profiles.
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.
Firewall Policies and NAT — This question tests Firewall Policies and NAT — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A VIP configured to map the public IP to the web server's private IP — Option B is correct because a Virtual IP (VIP) is required to map the public IP address to the web server's private IP, allowing inbound traffic to reach the internal server. Option E is correct because a firewall policy must have the destination set to the VIP and must include an application control profile to enforce blocking of specific web applications on the HTTPS traffic.
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.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An admin needs to allow inbound SMTP traffic from the internet to a mail server in the DMZ. The public IP is 203.0.113.10, and the mail server's private IP is 10.0.0.5. Which VIP configuration is correct?
medium
✓ A.VIP: external IP 203.0.113.10 port 25 -> internal IP 10.0.0.5 port 25
B.VIP: external IP 203.0.113.10 port 25 -> internal IP 10.0.0.5 port 80
C.VIP: external IP 203.0.113.10 all ports -> internal IP 10.0.0.5 all ports
D.VIP: external IP 203.0.113.10 port 80 -> internal IP 10.0.0.5 port 80
Why A: Option A is correct because it configures a Virtual IP (VIP) that maps the public IP 203.0.113.10 on TCP port 25 (SMTP) to the internal mail server IP 10.0.0.5 on port 25. This allows inbound SMTP traffic from the internet to reach the mail server in the DMZ, performing both destination NAT (DNAT) and port forwarding for the specific SMTP service.
Variation 2. An admin needs to allow traffic from a specific IP to a web server on port 8080. The web server is behind a VIP that forwards port 80 to port 8080. When configuring the security policy, which destination should be used?
medium
A.The virtual IP address of the FortiGate
B.The real server IP address
✓ C.The VIP object
D.Any destination, because the VIP translates automatically
Why C: When using VIP, the security policy destination should reference the VIP object, not the real server IP. The VIP handles the translation of destination IP and port.
Last reviewed: Jun 24, 2026
Question Discussion
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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.
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