The answer is policy-based routing (PBR). This feature is correct because it allows you to override the routing table by applying a route map that matches specific traffic characteristics—such as destination IP or port—and explicitly sets the next-hop interface, ensuring traffic to that web server always exits through the designated ISP link regardless of dynamic route changes. On the Fortinet NSE 4 Network Security Professional exam, this tests your understanding of how PBR differs from static or dynamic routing, often appearing in scenario-based questions where the routing table’s default behavior must be bypassed for granular traffic control. A common trap is confusing PBR with policy routes in firewall policies; remember that PBR operates at the routing level, not the firewall policy level. Memory tip: “PBR picks the path, not the policy.”
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 wants to ensure that traffic to a specific web server always exits through a particular ISP link, regardless of route changes. Which feature should be configured?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Why wrong: ECMP distributes traffic across multiple paths; it does not force traffic to a specific link.
B
Policy-based routing (PBR)
Policy routes allow forwarding decisions based on source/destination, overriding the routing table.
C
Static route with higher distance
Why wrong: Higher distance makes the route less preferred; not suitable for forcing traffic.
D
SD-WAN with load balancing
Why wrong: SD-WAN load balancing can distribute traffic but not guarantee all traffic to a specific server goes out one link unless configured with rules.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Policy-based routing (PBR)
Policy-based routing (PBR) allows you to override the routing table by applying a route map to match traffic (e.g., source/destination IP, port) and explicitly set the next-hop interface or ISP link. This ensures traffic to the specific web server always exits through the designated ISP, regardless of dynamic route changes or the routing table's default behavior.
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.
✗
Equal-cost multi-path (ECMP) routing
Why it's wrong here
ECMP distributes traffic across multiple paths; it does not force traffic to a specific link.
✓
Policy-based routing (PBR)
Why this is correct
Policy routes allow forwarding decisions based on source/destination, overriding the routing table.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Static route with higher distance
Why it's wrong here
Higher distance makes the route less preferred; not suitable for forcing traffic.
✗
SD-WAN with load balancing
Why it's wrong here
SD-WAN load balancing can distribute traffic but not guarantee all traffic to a specific server goes out one link unless configured with rules.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse PBR with static routing or SD-WAN load balancing, thinking that a static route with a higher distance or SD-WAN can force traffic to a specific link, but only PBR provides the granular match-and-set logic to override the routing table for specific traffic flows regardless of route changes.
Detailed technical explanation
How to think about this question
PBR uses route maps with match and set statements; the 'set ip next-hop' command overrides the routing table for matched packets. In Fortinet's FortiOS, PBR is configured under 'config router policy' and can also use 'set output-device' to force traffic out a specific interface. A real-world scenario is when a company must route all traffic to a critical SaaS application through a dedicated MPLS link for compliance, while other traffic uses a cheaper broadband link.
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: Policy-based routing (PBR) — Policy-based routing (PBR) allows you to override the routing table by applying a route map to match traffic (e.g., source/destination IP, port) and explicitly set the next-hop interface or ISP link. This ensures traffic to the specific web server always exits through the designated ISP, regardless of dynamic route changes or the routing table's default behavior.
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: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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. An administrator attempts to configure a policy route to route specific traffic from an internal subnet (10.1.1.0/24) to the internet via a different ISP. The policy route is created but traffic is still using the default route. What is the most likely cause?
hard
✓ A.The outgoing interface in the policy route is down.
B.The policy route is not using the correct source interface.
C.The destination address in the policy route is incorrect.
D.The static default route has a lower administrative distance than the policy route.
Why A: Policy routes in FortiGate have a higher priority than static routes, but they are only applied if the specified outgoing interface is operationally up. If the outgoing interface is down, the policy route is skipped, and traffic falls back to the default route. This is the most likely cause because the administrator confirmed the policy route was created but traffic still uses the default route.
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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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