- A
Create a Virtual IP (VIP) mapping 203.0.113.5 to 192.168.1.10
A VIP is necessary for destination NAT (DNAT) to forward public IP to internal server.
- B
Create a firewall policy from WAN to DMZ allowing HTTPS and referencing the VIP as destination
A firewall policy must permit the traffic; the VIP object is used as the destination in the policy.
- C
Configure Central SNAT to translate the server's source IP for return traffic
Why wrong: Central SNAT is not needed; the VIP handles both forward and return translation.
- D
Create an IP pool with fixed port range for source translation
Why wrong: Fixed port range is for source NAT, not required for inbound HTTPS; the server's response uses the VIP's translation.
- E
Enable 'allow source port translation' on the VIP
Why wrong: There is no such setting on VIP; VIP does not translate source ports.
Quick Answer
The answer is creating a firewall policy from WAN to DMZ allowing HTTPS and referencing the VIP as destination, along with configuring the Virtual IP (VIP) object itself. This is correct because a VIP performs destination NAT by mapping the public IP 203.0.113.5 to the internal server 192.168.1.10, while the firewall policy must explicitly reference that VIP as the destination to activate the translation and permit the inbound HTTPS traffic. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this tests your understanding that VIPs alone do not allow traffic—they only define the NAT mapping, and a policy is required to apply it. A common trap is thinking the VIP alone handles everything, but the policy is the enforcement point. Memory tip: “VIP maps, policy permits—both are needed for inbound HTTPS to hit its target.”
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 administrator needs to allow inbound HTTPS traffic to a web server located at 192.168.1.10. The public IP is 203.0.113.5. The administrator wants to translate the destination to the internal server and also translate the source port to a fixed range for logging purposes. Which TWO configuration elements are required?
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
Create a Virtual IP (VIP) mapping 203.0.113.5 to 192.168.1.10
A Virtual IP (VIP) is required to map the public IP (203.0.113.5) to the internal server IP (192.168.1.10) for destination NAT. This allows inbound HTTPS traffic to be translated to the private server. Additionally, a firewall policy from WAN to DMZ must reference the VIP as the destination and allow HTTPS to permit the traffic and apply the NAT translation.
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.
- ✓
Create a Virtual IP (VIP) mapping 203.0.113.5 to 192.168.1.10
Why this is correct
A VIP is necessary for destination NAT (DNAT) to forward public IP to internal server.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Create a firewall policy from WAN to DMZ allowing HTTPS and referencing the VIP as destination
Why this is correct
A firewall policy must permit the traffic; the VIP object is used as the destination in the policy.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure Central SNAT to translate the server's source IP for return traffic
Why it's wrong here
Central SNAT is not needed; the VIP handles both forward and return translation.
- ✗
Create an IP pool with fixed port range for source translation
- ✗
Enable 'allow source port translation' on the VIP
Why it's wrong here
There is no such setting on VIP; VIP does not translate source ports.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VIPs (destination NAT) with IP pools (source NAT) or Central SNAT, mistakenly thinking source translation is needed for inbound traffic, when the question specifically requires destination translation and fixed port mapping for logging.
Detailed technical explanation
How to think about this question
Under the hood, a FortiGate VIP performs destination NAT (DNAT) by rewriting the destination IP (and optionally port) of incoming packets. The 'fixed port' option within the VIP configuration ensures that the destination port is not randomized, which is critical for logging and application compatibility. In real-world scenarios, this is often used for HTTPS servers where consistent port mapping simplifies firewall logs and security monitoring.
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.
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FAQ
Questions learners often ask
What does this NSE4 question test?
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: Create a Virtual IP (VIP) mapping 203.0.113.5 to 192.168.1.10 — A Virtual IP (VIP) is required to map the public IP (203.0.113.5) to the internal server IP (192.168.1.10) for destination NAT. This allows inbound HTTPS traffic to be translated to the private server. Additionally, a firewall policy from WAN to DMZ must reference the VIP as the destination and allow HTTPS to permit the traffic and apply the NAT translation.
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 →
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Last reviewed: Jun 24, 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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