NSE4 System and Network Administration Practice Question
This NSE4 practice question tests your understanding of system and network administration. 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 of the following is required to allow a FortiGate to synchronize its clock with an NTP server?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Firewall policy allowing NTP traffic (UDP 123) from the FortiGate to the NTP server
A FortiGate synchronizes its clock with an NTP server using NTP traffic, which relies on UDP port 123. Without a firewall policy that explicitly permits outbound UDP 123 traffic from the FortiGate to the NTP server, the NTP packets are dropped by the FortiGate's own firewall engine, preventing clock synchronization. This policy is required even for traffic originating from the FortiGate itself, as the FortiGate applies firewall rules to all traffic, including management traffic.
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.
✓
Firewall policy allowing NTP traffic (UDP 123) from the FortiGate to the NTP server
Why this is correct
If the NTP server is on a different network, NTP traffic must be permitted.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable NTP in the admin settings
Why it's wrong here
NTP is enabled under config system ntp, not admin settings.
✗
Set the timezone using config system global
Why it's wrong here
Timezone setting does not affect NTP synchronization.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume management traffic (like NTP) is exempt from firewall policies, but FortiGate treats all traffic—including its own—as subject to policy enforcement, so a specific firewall policy for UDP 123 is mandatory for NTP synchronization to succeed.
Detailed technical explanation
How to think about this question
The FortiGate's firewall engine inspects all traffic, including traffic generated by the FortiGate itself (such as NTP, DNS, or FortiGuard queries). This means that even for outbound NTP requests from the FortiGate's NTP client, an explicit firewall policy with source interface (e.g., 'port1'), destination interface (e.g., 'wan1'), source address (the FortiGate's IP), destination address (NTP server IP), service (NTP/UDP 123), and action (accept) must exist. In some firmware versions, a default implicit policy may allow such traffic, but the NSE4 exam emphasizes that a configured policy is required for reliable operation, especially in hardened or multi-VDOM environments.
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.
System and Network Administration — This question tests System and Network Administration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Firewall policy allowing NTP traffic (UDP 123) from the FortiGate to the NTP server — A FortiGate synchronizes its clock with an NTP server using NTP traffic, which relies on UDP port 123. Without a firewall policy that explicitly permits outbound UDP 123 traffic from the FortiGate to the NTP server, the NTP packets are dropped by the FortiGate's own firewall engine, preventing clock synchronization. This policy is required even for traffic originating from the FortiGate itself, as the FortiGate applies firewall rules to all traffic, including management traffic.
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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