NSE4 System and Network Administration Practice Question
This NSE4 practice question tests your understanding of system and network administration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company wants to ensure that administrative access to FortiGate is only allowed from the internal trusted network (192.168.1.0/24) and that all other access attempts are blocked. Which CLI command should the administrator configure first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
config system admin; edit admin; set trusthost 192.168.1.0 255.255.255.0; end
Option A is correct because the `config system admin` command with `set trusthost` restricts administrative login attempts to only the specified source IP address or subnet. By setting `trusthost 192.168.1.0 255.255.255.0`, the FortiGate will only allow admin access from the 192.168.1.0/24 network, blocking all other sources. This is the foundational step to enforce source-based access control for administrative interfaces.
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.
✓
config system admin; edit admin; set trusthost 192.168.1.0 255.255.255.0; end
Why this is correct
Trusted hosts restrict administrative access to specified source IPs.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
config system interface; edit port1; set allowaccess ping https ssh; end
Why it's wrong here
This grants access from any source, not restricting to 192.168.1.0/24.
✗
config system global; set admin-http-redirect enable; end
This only changes the port, does not restrict access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `set allowaccess` (which enables protocols on an interface) with `set trusthost` (which restricts source IPs for admin login), leading them to select Option B thinking it controls who can access the device.
Detailed technical explanation
How to think about this question
The `trusthost` setting is evaluated before any authentication attempt; if the source IP does not match the configured trusthost, the FortiGate drops the connection at the TCP level without even presenting a login prompt. This provides a first line of defense against brute-force attacks from untrusted networks. In a real-world scenario, an administrator might combine multiple trusthost entries (e.g., for VPN or jump-box IPs) to allow access from specific remote locations while still blocking the rest of the internet.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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: config system admin; edit admin; set trusthost 192.168.1.0 255.255.255.0; end — Option A is correct because the `config system admin` command with `set trusthost` restricts administrative login attempts to only the specified source IP address or subnet. By setting `trusthost 192.168.1.0 255.255.255.0`, the FortiGate will only allow admin access from the 192.168.1.0/24 network, blocking all other sources. This is the foundational step to enforce source-based access control for administrative interfaces.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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