Question 1mediummulti select
Review the full routing breakdown →Question 607 of 1,000
Quick Answer
The correct answer is to create an SD-WAN rule that matches HTTP traffic and sets WAN1 as the preferred interface, combined with ensuring the default route points to WAN2. This works because SD-WAN rules on a FortiGate allow you to route HTTP traffic through a specific WAN interface based on application signatures, overriding the default routing table for selected traffic. On the Fortinet NSE 4 Network Security Professional exam, this scenario tests your understanding of SD-WAN’s per-application steering versus traditional policy-based routing—a common trap is confusing SD-WAN rules with PBR, but SD-WAN is the modern, recommended method for application-aware routing. Remember the memory tip: “SD-WAN steers apps, PBR steers packets”—for HTTP traffic, think “SD-WAN for the plan, default route for the rest.”
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 company has two internet connections (WAN1 and WAN2). The administrator wants to route HTTP traffic from the internal network through WAN1, and all other traffic through WAN2. Which TWO configurations are needed?
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
✓
Define an SD-WAN rule that matches HTTP and sets WAN1 as preferred
Option A is correct because SD-WAN rules allow you to define application-based routing policies. By creating an SD-WAN rule that matches HTTP traffic and sets WAN1 as the preferred interface, the FortiGate will automatically steer HTTP sessions out through WAN1 while using the default routing table (which points to WAN2) for all other traffic. This leverages the SD-WAN feature's ability to perform per-application load balancing and failover without requiring policy-based routing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse policy-based routing (Option D) with SD-WAN rules (Option A), not realizing that both are valid methods for application-based routing on FortiGate, and the question asks for TWO configurations needed, so both A and D are correct.
Detailed technical explanation
How to think about this question
SD-WAN rules in FortiOS operate at the application layer using Deep Packet Inspection (DPI) to identify traffic by service (e.g., HTTP on TCP port 80). When an SD-WAN rule matches, it overrides the default routing table for that session, allowing per-application steering. Policy-based routing (PBR) works at the network layer by matching source/destination IPs or ports, but requires explicit match conditions and can be less flexible than SD-WAN for application-aware routing. In real-world deployments, combining SD-WAN rules with link health checks ensures automatic failover if WAN1 becomes unavailable for HTTP traffic.
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
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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: Define an SD-WAN rule that matches HTTP and sets WAN1 as preferred — Option A is correct because SD-WAN rules allow you to define application-based routing policies. By creating an SD-WAN rule that matches HTTP traffic and sets WAN1 as the preferred interface, the FortiGate will automatically steer HTTP sessions out through WAN1 while using the default routing table (which points to WAN2) for all other traffic. This leverages the SD-WAN feature's ability to perform per-application load balancing and failover without requiring policy-based routing.
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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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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