The answer is that the administrator must enable the newly created firewall policy and ensure no other policy above it allows traffic from 10.0.0.100. This is correct because in FortiGate, a firewall policy is disabled by default after creation, meaning the deny action will not be enforced until the policy is toggled to enabled. Additionally, FortiGate processes policies sequentially from top to bottom, so any higher-priority policy with a matching source and an ALLOW action would override the deny rule, making the block ineffective. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this scenario tests your understanding of policy order and default policy states—a common trap is assuming a newly created policy is active. A useful memory tip is “Enable first, then check the order above,” reminding you that a disabled policy is invisible to traffic and that the first match wins in FortiGate’s sequential evaluation.
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.
A FortiGate administrator needs to block all traffic from a specific IP address (10.0.0.100) to the internet, but allow all other internal users. The administrator has created a firewall policy with source=10.0.0.100, destination=all, service=all, action=DENY, and placed it at the top of the policy list. Which TWO additional steps should the administrator take to ensure the block is effective? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable the policy
Option A is correct because a newly created firewall policy in FortiGate is disabled by default. The administrator must explicitly enable the policy for it to be enforced. Without enabling, the deny rule will not process traffic, leaving the block ineffective.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Enable the policy
Why this is correct
Policies are disabled by default; an enabled policy is required for it to take effect.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure an IP Pool for the deny policy
Why it's wrong here
IP Pools are for source NAT, not relevant for deny policies.
✗
Add a schedule to the policy for business hours
Why it's wrong here
A schedule would limit when the policy is active, not needed for a constant block.
✓
Ensure no other policy above this one allows traffic from 10.0.0.100
Why this is correct
If a higher policy allows the traffic, the deny policy will never be matched.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set the action to ACCEPT
Why it's wrong here
ACCEPT would allow the traffic, not block it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often forget that new policies are disabled by default, and they may overlook the importance of policy order when a deny rule is placed at the top but a previous ACCEPT rule exists for the same source.
Detailed technical explanation
How to think about this question
FortiGate firewall policies are evaluated in sequential order from top to bottom, and the first matching policy determines the action. A disabled policy is skipped entirely during evaluation, so even if placed at the top, it will not match traffic. The administrator must also verify that no higher-priority policy (above the deny rule) matches the source IP with an ACCEPT action, as that would allow the traffic before the deny rule is reached.
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Enable the policy — Option A is correct because a newly created firewall policy in FortiGate is disabled by default. The administrator must explicitly enable the policy for it to be enforced. Without enabling, the deny rule will not process traffic, leaving the block ineffective.
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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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.
Question Discussion
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