The answer is that policy-based NAT on a FortiGate is configured directly in the firewall policy using the 'set nat' option. This is correct because, in policy-based NAT, the source NAT translation is an attribute of the firewall policy itself, meaning you enable it with the 'set nat' command within the policy configuration, rather than defining a separate translation rule. In contrast, Central NAT uses a dedicated NAT policy table that operates independently from the firewall policies, allowing for more granular control and easier management of large rule sets. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this distinction tests your understanding of the two NAT architectures and their configuration workflows; a common trap is assuming both methods use the same policy table. A helpful memory tip is to think of policy-based NAT as "inline" NAT—the translation lives inside the firewall policy—while Central NAT is "out-of-line," living in its own separate policy table.
NSE4 Firewall Policies and NAT Practice Question
This NSE4 practice question tests your understanding of firewall policies and nat. 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.
Which of the following is a characteristic of policy-based NAT on a FortiGate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
NAT is configured directly in the firewall policy using the 'set nat' option
Policy-based NAT uses the 'set nat' command in a firewall policy to enable source NAT, while Central NAT uses a separate NAT policy table.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
NAT is configured directly in the firewall policy using the 'set nat' option
Policy-based NAT can use IP pools or overload without pool.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related NSE4 NAT questions on configuration and troubleshooting.
Firewall Policies and NAT — This question tests Firewall Policies and NAT — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: NAT is configured directly in the firewall policy using the 'set nat' option — Policy-based NAT uses the 'set nat' command in a firewall policy to enable source NAT, while Central NAT uses a separate NAT policy table.
What should I do if I get this NSE4 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related NSE4 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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