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 FortiGate is configured with two equal-cost static routes to the same destination network (0.0.0.0/0) via two different ISPs. The administrator wants to use both links simultaneously for load balancing. What must be enabled?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ECMP (Equal Cost Multi-Path) routing
Equal Cost Multi-Path (ECMP) routing is the correct feature to enable because it allows a FortiGate to load-balance traffic across multiple static routes that have the same metric (distance) to the same destination (0.0.0.0/0). By default, FortiGate uses a single best route; enabling ECMP distributes sessions across both ISP links based on a hash algorithm (e.g., source-destination IP), achieving simultaneous utilization without requiring dynamic routing protocols.
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.
✓
ECMP (Equal Cost Multi-Path) routing
Why this is correct
ECMP allows the FortiGate to distribute traffic across multiple paths with equal cost.
Related concept
Read the scenario before looking for a memorised answer.
✗
SD-WAN
Why it's wrong here
SD-WAN is an overlay that uses multiple links but is not required for basic ECMP.
✗
Link load balancing
Why it's wrong here
Link load balancing is a different concept, often used in HA.
✗
Policy routing
Why it's wrong here
Policy routing is used for overriding destination-based routing for specific traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse ECMP with SD-WAN, assuming SD-WAN is mandatory for any multi-WAN load balancing, when in fact ECMP alone suffices for equal-cost static routes without application-aware steering or link health monitoring.
Detailed technical explanation
How to think about this question
ECMP in FortiOS uses a per-session load-balancing method (default: source-IP-based hash) to ensure that all packets of a single session follow the same path, preventing out-of-order delivery. The hash algorithm can be configured via 'config system settings' with options like 'source-ip-based' or 'weighted' for unequal distribution. In real-world scenarios, ECMP is commonly used with BGP or static routes to dual-homed ISPs, but it does not provide health-checking—if one link fails, the route remains active unless combined with route monitoring or SD-WAN.
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: ECMP (Equal Cost Multi-Path) routing — Equal Cost Multi-Path (ECMP) routing is the correct feature to enable because it allows a FortiGate to load-balance traffic across multiple static routes that have the same metric (distance) to the same destination (0.0.0.0/0). By default, FortiGate uses a single best route; enabling ECMP distributes sessions across both ISP links based on a hash algorithm (e.g., source-destination IP), achieving simultaneous utilization without requiring dynamic routing protocols.
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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