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.
An administrator configures a policy route to send all traffic from a specific subnet to a different next-hop. However, traffic from that subnet is still using the default route. Which configuration could be causing this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy route is applied to the wrong incoming interface
Policy routes are evaluated based on the incoming interface of the traffic. If the policy route is applied to the wrong incoming interface, traffic from the specified subnet arriving on a different interface will not match the policy and will instead follow the default route. This is a common misconfiguration where the administrator assumes the policy applies globally rather than per-interface.
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.
✗
The firewall policy denies the traffic before policy routing
Why it's wrong here
Policy routing occurs before firewall policy lookup.
✓
The policy route is applied to the wrong incoming interface
Why this is correct
If the source interface does not match the incoming interface of the traffic, the policy route will not apply.
Related concept
Read the scenario before looking for a memorised answer.
✗
The default route has a higher administrative distance
Why it's wrong here
Higher distance means less preferred, so policy route would take precedence.
✗
The policy route destination is set to all
Why it's wrong here
This would not cause the issue; it would match all destinations.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume policy routes apply globally to all traffic matching the source/destination, forgetting that FortiGate requires the incoming interface to be explicitly specified for policy routes to be evaluated.
Detailed technical explanation
How to think about this question
FortiGate processes traffic in a specific order: first, policy routing (based on incoming interface and source/destination), then firewall policies, then routing table lookups. Policy routes are interface-specific and defined under 'config router policy' with a 'input-device' parameter. If the input device does not match the actual incoming interface, the policy route is skipped entirely, and the traffic falls through to the routing table where the default route (usually with administrative distance 10) is selected. In real-world scenarios, this often happens when traffic enters via a VLAN interface but the policy route is applied to the physical interface or a different subinterface.
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: The policy route is applied to the wrong incoming interface — Policy routes are evaluated based on the incoming interface of the traffic. If the policy route is applied to the wrong incoming interface, traffic from the specified subnet arriving on a different interface will not match the policy and will instead follow the default route. This is a common misconfiguration where the administrator assumes the policy applies globally rather than per-interface.
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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