The answer is to create individual Virtual IPs for each internal server and then group them into a VIP group, then configure a firewall policy with the destination set to that VIP group and the action set to allow. This is correct because each VIP maps a unique external port to a specific internal IP and port, and the VIP group bundles these mappings so a single firewall policy can handle all port-forwarding rules for the same public IP. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this scenario tests your understanding of how VIP groups streamline policy management when multiple internal services share one public IP but use different ports. A common trap is trying to use a single VIP with multiple port mappings, which FortiGate does not support—each internal server requires its own VIP. A helpful memory tip: think of the VIP group as a “port-forwarding playlist” where each VIP is a unique song, and the firewall policy is the speaker that plays them all.
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.
An admin needs to configure a FortiGate to allow multiple internal servers to be accessible from the internet using the same public IP but different ports. For example, internal server A (192.168.1.10:80) should be reachable via 203.0.113.10:8080, and internal server B (192.168.1.20:443) via 203.0.113.10:8443. Which TWO configuration steps are required?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create two separate VIPs, one for each server, and add them to a VIP group
Option A is correct because each internal server requires a unique Virtual IP (VIP) to map a specific external port to a specific internal IP and port. Adding these VIPs to a VIP group allows a single firewall policy to reference all of them, enabling the FortiGate to differentiate traffic based on the destination port and forward it to the correct internal server.
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 two separate VIPs, one for each server, and add them to a VIP group
Why this is correct
VIP groups allow combining multiple VIPs under one destination object.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable NAT on the policy to preserve the source IP
Why it's wrong here
NAT is not required for inbound traffic; the VIP handles destination translation.
✓
Configure a firewall policy with destination set to the VIP group and action set to allow
Why this is correct
The policy uses the VIP group as the destination and enables inbound access.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure Central SNAT to translate the source IP
Why it's wrong here
Central SNAT is for outbound traffic, not inbound.
✗
Create a single VIP with port forwarding that maps multiple ports
Why it's wrong here
A single VIP cannot map multiple ports; port forwarding is per VIP.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think a single VIP with multiple port mappings can handle different internal servers, but FortiGate VIPs are one-to-one mappings; a VIP group is required to aggregate multiple VIPs under one policy.
Detailed technical explanation
How to think about this question
Under the hood, each VIP creates a destination NAT (DNAT) entry that rewrites the destination IP and port of incoming packets. The VIP group acts as a logical container that the firewall policy matches against; the FortiGate uses the destination port in the packet to select the correct VIP from the group. In real-world deployments, this is commonly used for hosting multiple services (e.g., HTTP, HTTPS, SSH) behind a single public IP while preserving the ability to scale or change internal servers independently.
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: Create two separate VIPs, one for each server, and add them to a VIP group — Option A is correct because each internal server requires a unique Virtual IP (VIP) to map a specific external port to a specific internal IP and port. Adding these VIPs to a VIP group allows a single firewall policy to reference all of them, enabling the FortiGate to differentiate traffic based on the destination port and forward it to the correct internal server.
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.
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Question Discussion
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