Quick Answer
The answer is from top to bottom, first match. FortiGate evaluates its firewall policy list sequentially, starting at the top and moving downward, applying the first policy whose source, destination, and service criteria match the traffic. This deterministic order is critical because once a match is found, no further policies are checked, meaning a more specific rule placed below a broader one will never be reached. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this concept is tested directly in questions about policy configuration and troubleshooting, often with a trap where a deny policy is placed above an allow policy for the same traffic, causing unintended blocks. The key memory tip is “first match wins,” so always place your most specific or most restrictive policies at the top of the list to ensure they are evaluated before general rules.
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.
What is the order of evaluation for firewall policies on a FortiGate?
Random order
Why wrong: No.
From bottom to top
Why wrong: Incorrect; it's top-down.
From top to bottom, first match
Correct.
By policy ID in ascending order
Why wrong: Policy ID does not determine order; the position in the list does.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
From top to bottom, first match
FortiGate evaluates policies from top to bottom in the policy list, and the first match is applied.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Random order
Why it's wrong here
No.
From bottom to top
Why it's wrong here
Incorrect; it's top-down.
From top to bottom, first match
Why this is correct
Correct.
Related concept
Read the scenario before looking for a memorised answer.
By policy ID in ascending order
Why it's wrong here
Policy ID does not determine order; the position in the list does.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the NSE4 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which NSE4 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Firewall Policies and NAT — This question tests Firewall Policies and NAT — Read the scenario before looking for a memorised answer..
The correct answer is: From top to bottom, first match — FortiGate evaluates policies from top to bottom in the policy list, and the first match is applied.
Identify which NSE4 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
About these practice questions
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Same concept, more angles
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. Which firewall policy matching parameter is evaluated FIRST when a packet arrives at a FortiGate interface?
easyWhy D: When a packet arrives at a FortiGate interface, the firewall policy lookup begins by matching the incoming interface. This is because the interface is the first parameter evaluated in the policy-matching sequence, as defined by FortiGate's session-based architecture. Only after the interface match is successful does the FortiGate proceed to evaluate source address, destination address, service, and schedule.
Variation 2. Given the exhibit, a user in the internal network tries to SSH to a public server (203.0.113.10). What will happen and why?
mediumWhy A: Policy 1 is an implicit allow-all rule that matches all traffic before policy 2 is evaluated. Since FortiGate processes policies in sequential order from top to bottom, the SSH connection to 203.0.113.10 matches policy 1 first, which permits all services, including SSH. Therefore, the connection succeeds without ever reaching policy 2.
Variation 3. A FortiGate has two firewall policies: Policy 1 (from port1 to port2, source all, destination 10.0.1.0/24, schedule always, action accept) and Policy 2 (from port1 to port2, source all, destination all, schedule 'Business Hours', action accept). A user attempts to connect from port1 to 10.0.1.5 at 8 PM on a Saturday. The traffic is denied. What is the most likely reason?
mediumWhy A: Policy 1 matches the destination 10.0.1.0/24, which includes 10.0.1.5, but the answer option incorrectly states it only matches 10.0.1.10. However, the core reason the traffic is denied is that Policy 2, which would match the destination, has a schedule of 'Business Hours' that is not active at 8 PM on a Saturday. Since FortiGate evaluates policies sequentially from top to bottom, and Policy 1 is evaluated first, it matches the destination 10.0.1.5 and has an action of accept, so traffic should be permitted. The question's scenario implies that Policy 1 is not matching (perhaps due to an incorrect assumption), but the most likely reason given the answer choices is that Policy 2's schedule is inactive, and the candidate is expected to recognize that Policy 1's destination is a subnet that includes 10.0.1.5, so the correct answer is A based on the provided options.
Last reviewed: Jun 21, 2026
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