Quick Answer
The answer is FQDN, Subnet, and Geography. A Subnet address object defines a range of IP addresses using a network address and subnet mask, such as 192.168.1.0/24, making it a fundamental building block for firewall policies that match traffic based on source or destination IP ranges. An FQDN object resolves a fully qualified domain name to its current IP addresses dynamically, while a Geography object matches traffic based on the country or region of the source or destination IP. On the Fortinet NSE 4 Network Security Professional exam, this question tests your ability to distinguish between the core object types used in policy configuration; a common trap is confusing a simple IP address range with a Subnet object or mistaking a wildcard FQDN for a standard FQDN. Remember the mnemonic “SFG” for Subnet, FQDN, and Geography—these three are the only valid types among the common choices, and you can always spot a Geography object by its country-code syntax like “US” or “CN.”
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.
Which THREE of the following are valid address object types in FortiGate? (Choose three.)
Subnet
Standard address object.
MAC address
Why wrong: Not a standard address object type in policies.
Geography
Country-based object.
FQDN
Fully Qualified Domain Name object.
Wildcard
Why wrong: Wildcard is not a separate type; Wildcard FQDN is a type.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Subnet
A is correct because a Subnet address object in FortiGate defines a range of IP addresses using a network address and subnet mask (e.g., 192.168.1.0/24). This is one of the fundamental object types used in firewall policies to match traffic based on source or destination IP ranges.
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.
Subnet
Why this is correct
Standard address object.
Related concept
Read the scenario before looking for a memorised answer.
MAC address
Why it's wrong here
Not a standard address object type in policies.
Geography
Why this is correct
Country-based object.
Related concept
Read the scenario before looking for a memorised answer.
FQDN
Why this is correct
Fully Qualified Domain Name object.
Related concept
Read the scenario before looking for a memorised answer.
Wildcard
Why it's wrong here
Wildcard is not a separate type; Wildcard FQDN is a type.
Common exam traps
The trap here is that candidates often confuse the 'Wildcard' address type with the wildcard subnet mask notation (e.g., 0.0.0.255) used within a Subnet object, leading them to incorrectly select Wildcard as a separate object type.
Detailed technical explanation
FortiGate supports address objects of types Subnet, IP Range, FQDN, and Geography, each serving different policy-matching needs. Geography objects leverage MaxMind GeoIP databases to match traffic by country, while FQDN objects resolve domain names to IP addresses at policy evaluation time, with a default TTL-based cache. Understanding these types is critical for designing efficient firewall policies that minimize object count and avoid resolution delays.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
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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: Subnet — A is correct because a Subnet address object in FortiGate defines a range of IP addresses using a network address and subnet mask (e.g., 192.168.1.0/24). This is one of the fundamental object types used in firewall policies to match traffic based on source or destination IP ranges.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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 address object type allows you to match traffic based on the domain name in the HTTPS SNI field?
easyWhy B: Wildcard FQDN objects can match domain names (fully qualified domain names) even with wildcards, and FortiGate can use SNI to match HTTPS traffic.
Variation 2. Which type of address object allows a FortiGate to perform DNS resolution to match traffic based on a domain name?
easyWhy C: Option C is correct because an FQDN (Fully Qualified Domain Name) address object in FortiGate allows the firewall to perform DNS resolution to match traffic based on a domain name. When a policy uses an FQDN object, FortiGate resolves the domain name to IP addresses via DNS and updates the policy dynamically as the DNS record changes, enabling traffic matching by domain rather than static IP.
Variation 3. Which address object type can be used to match traffic based on the source country?
easyWhy C: Geography address objects allow matching based on country (or region) using the IP geolocation database. This is useful for geo-blocking.
Variation 4. Which of the following is a valid address object type in FortiGate that can be used to match traffic based on the domain name of the destination?
easyWhy C: FQDN address objects allow matching traffic based on fully qualified domain names, which are resolved to IP addresses dynamically.
Variation 5. Which of the following is NOT a valid address object type in FortiGate?
easyWhy D: FortiGate address objects support Subnet, Wildcard FQDN, and Geography types, but MAC addresses are not a valid address object type. MAC addresses are used in other contexts like static ARP entries or DHCP reservations, not as firewall address objects.
Variation 6. An admin wants to allow traffic only from specific countries to access a web server. Which type of address object should be used in the firewall policy?
easyWhy B: FortiGate supports geography-based address objects that allow or deny traffic based on the source IP's country. These are configured using geography objects.
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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