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 create a firewall policy that allows outbound traffic to the internet but denies access to a specific list of malicious IP addresses. The malicious IP list is updated frequently. Which address object type should be used for the destination addresses to block?
IP Range address object
Why wrong: IP ranges are static and not ideal for frequently changing lists.
FQDN address object
FQDN objects can be updated via DNS or external dynamic lists.
Geography address object
Why wrong: Geography objects block by country, not specific IPs.
Subnet address object
Why wrong: Subnet objects are static and not suitable for dynamic lists.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
FQDN address object
FQDN address objects can resolve to a list of IP addresses that change dynamically, making them suitable for frequently updated IP lists. Subnet objects are static.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
IP Range address object
Why it's wrong here
IP ranges are static and not ideal for frequently changing lists.
FQDN address object
Geography address object
Why it's wrong here
Geography objects block by country, not specific IPs.
Subnet address object
Why it's wrong here
Subnet objects are static and not suitable for dynamic lists.
Common exam traps
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
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
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related NSE4 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Firewall Policies and NAT — This question tests Firewall Policies and NAT — CIDR notation defines the prefix length..
The correct answer is: FQDN address object — FQDN address objects can resolve to a list of IP addresses that change dynamically, making them suitable for frequently updated IP lists. Subnet objects are static.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related NSE4 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 21, 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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