Quick Answer
The answer is the FQDN address object. This is correct because a FortiGate FQDN object dynamically resolves a fully qualified domain name to its current IP address at the time of policy evaluation, automatically updating the destination whenever the server’s IP changes. This eliminates the need for manual reconfiguration, making it the ideal choice for environments where an external server’s IP is not static. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this concept tests your understanding of dynamic address objects versus static IP or subnet objects, often appearing in scenario-based questions about firewall policy configuration for frequently changing destinations. A common trap is confusing FQDN objects with DNS filter profiles or wildcard FQDN objects, which serve different purposes. Memory tip: Think “FQDN = Follows the Domain, Not the IP” to remember it updates automatically with DNS resolution.
This NSE4 practice question tests your understanding of firewall policies and nat. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 wants to allow traffic from the internal network to a specific external server using its fully qualified domain name (FQDN) rather than an IP address, because the server's IP changes frequently. Which type of address object should the administrator create for the destination?
Subnet object
Why wrong: Subnet objects are static IP ranges.
Wildcard FQDN object
Why wrong: Wildcard FQDN matches multiple domains, not a single server.
Geography object
Why wrong: Geography objects match by country, not specific server.
FQDN object
FQDN object resolves a single domain name to its IP address.
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 object
The correct answer is D, FQDN object. FortiGate FQDN objects resolve domain names to IP addresses dynamically, allowing the firewall to update the destination IP automatically when the server's IP changes. This is ideal for scenarios where the external server uses a fully qualified domain name and its IP address is not static.
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 object
Why it's wrong here
Subnet objects are static IP ranges.
Wildcard FQDN object
Why it's wrong here
Wildcard FQDN matches multiple domains, not a single server.
Geography object
Why it's wrong here
Geography objects match by country, not specific server.
FQDN object
Why this is correct
FQDN object resolves a single domain name to its IP address.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may confuse Wildcard FQDN objects (used for domain pattern matching) with standard FQDN objects (used for DNS resolution to a single IP), leading them to select Option B incorrectly.
Detailed technical explanation
FortiGate FQDN objects rely on DNS resolution to map the domain name to an IP address, and the firewall periodically re-resolves the FQDN based on the configured TTL (Time-To-Live) from the DNS response. This allows the policy to adapt to IP changes without manual intervention, but note that the FQDN object must be used in a policy with the 'set type fqdn' option enabled, and the DNS server must be reachable for resolution to occur. In real-world scenarios, this is critical for accessing cloud services like AWS or Azure endpoints that use dynamic IPs.
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: FQDN object — The correct answer is D, FQDN object. FortiGate FQDN objects resolve domain names to IP addresses dynamically, allowing the firewall to update the destination IP automatically when the server's IP changes. This is ideal for scenarios where the external server uses a fully qualified domain name and its IP address is not static.
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.
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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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