The answer is policy-based routing (PBR), which should be configured with a policy matching the destination IP 203.0.113.50 and service TCP/443 to force that traffic out WAN2. PBR is the correct choice because it allows you to selectively override the default routing table based on criteria like source, destination, or service, ensuring that only specific traffic follows a different path while all other traffic continues to use the regular route via WAN1. On the Fortinet NSE 4 Network Security Professional exam, this scenario tests your understanding of how PBR differs from static routing and SD-WAN rules—a common trap is confusing PBR with policy-based NAT or route-based IPsec, but remember that PBR is purely about next-hop selection, not address translation. A useful memory tip: think of PBR as a “traffic bouncer” that checks each packet’s ID (destination and port) and sends it to a specific exit door, while the rest of the crowd flows through the main entrance.
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.
An organization has a FortiGate with two internet connections (WAN1 and WAN2). They want traffic to a specific web service (203.0.113.50 port 443) to always exit via WAN2. All other internet traffic should use WAN1. Which feature should be used to achieve this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Policy-based routing (PBR) configured with a policy matching the destination and service
Policy-based routing (PBR) allows traffic matching a policy to be routed to a specific next-hop or interface, overriding the regular routing table. This is the correct approach for selective routing.
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.
✗
Central NAT policy to force the traffic out of WAN2
Why it's wrong here
Central NAT only handles NAT, not routing decisions.
✗
Static route with a higher priority for WAN2 to 203.0.113.0/24
Why it's wrong here
A static route would affect all traffic to that subnet, but the requirement is for a specific service only.
✗
SD-WAN with a strategy of 'Best Quality'
Why it's wrong here
SD-WAN could achieve this, but the question asks for a feature; PBR is more direct.
✓
Policy-based routing (PBR) configured with a policy matching the destination and service
Why this is correct
PBR allows routing decisions based on firewall policy criteria.
Clue confirmation
The clue word "always" in the question point toward this answer.
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: Policy-based routing (PBR) configured with a policy matching the destination and service — Policy-based routing (PBR) allows traffic matching a policy to be routed to a specific next-hop or interface, overriding the regular routing table. This is the correct approach for selective routing.
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.
Are there clue words in this question I should notice?
Yes — watch for: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
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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. A FortiGate has multiple WAN interfaces (port1, port2) connected to different ISPs. The administrator wants traffic from the internal network to use port1 for general internet access but use port2 for traffic to a specific cloud service (203.0.113.0/24). Which feature should be used to achieve this?
medium
A.Create a VIP for the cloud service
B.Configure static routes with different distances
C.Use SD-WAN rules to load balance
✓ D.Use policy-based routing (PBR) to route traffic based on destination
Why D: Policy-based routing (PBR) allows you to override the default routing table based on criteria such as source/destination IP, protocol, or port. In this scenario, PBR can match traffic destined to 203.0.113.0/24 and force it out through port2, while all other internet traffic follows the default route via port1. This provides granular control without affecting the general routing behavior.
Last reviewed: Jun 21, 2026
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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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