The answer is to create an IP pool with the public IP address and set the type to Overload, enable logging on the firewall policy, and configure identity-based policy or authentication. This combination satisfies all three requirements because an Overload IP pool performs Port Address Translation (PAT), allowing many internal users to share a single public IP by mapping each session to a unique port. However, PAT alone does not identify which user initiated a connection; enabling logging on the policy records the source IP and port, while identity-based policy or authentication ties that session to a specific user account. On the Fortinet NSE 4 exam, this question tests your understanding that NAT and user tracking are separate functions—a common trap is thinking the IP pool itself tracks users. Remember the mnemonic “POL” for Pool (Overload), Logging, and identity-based Policy to recall the three required settings.
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 NAT for internal users accessing the internet. The requirements are: 1) All internal users must be translated to a single public IP. 2) The translation should use port address translation (PAT). 3) The configuration must allow tracking of which internal user initiated a connection. Which THREE settings must be configured? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable NAT on the firewall policy and select the IP pool
To translate to a single public IP with PAT, the admin should use an IP pool configured as overload (PAT). Additionally, to track users, the policy must have logging enabled for user activity, and optionally, identity-based policy or authentication can be used. The pool itself does not track users; logging does.
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.
✗
Set the policy's NAT to use the egress interface IP
Why it's wrong here
Using the interface IP would use PAT by default, but it wouldn't use a specific pool IP.
✗
Configure a central SNAT policy with the same pool
Why it's wrong here
Central SNAT is an alternative, but the question implies policy-based NAT is used.
✓
Enable NAT on the firewall policy and select the IP pool
Why this is correct
The policy must use NAT and reference the IP pool for translation.
Related concept
Static NAT maps one inside address to one outside address.
✓
Enable logging on the firewall policy to record user activity
Why this is correct
Logging allows tracking which internal IP made the connection.
Related concept
Static NAT maps one inside address to one outside address.
✓
Create an IP pool with the public IP address and set type to Overload
Why this is correct
Overload uses PAT to allow many internal IPs to share a single public IP.
Related concept
Static NAT maps one inside address to one outside address.
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: Enable NAT on the firewall policy and select the IP pool — To translate to a single public IP with PAT, the admin should use an IP pool configured as overload (PAT). Additionally, to track users, the policy must have logging enabled for user activity, and optionally, identity-based policy or authentication can be used. The pool itself does not track users; logging does.
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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