The answer is that the VDOM is not assigned to any virtual cluster. In a FortiGate HA active-active configuration, load balancing across cluster units depends entirely on virtual cluster membership; each VDOM must be explicitly mapped to a virtual cluster to distribute its traffic. Without this assignment, the VDOM defaults to the primary unit, which is why you see no load balancing despite the cluster being in active-active mode. On the Fortinet NSE 7 Advanced Security NSE7 exam, this concept tests your understanding that virtual clusters are the mechanism for per-VDOM load balancing, and a common trap is assuming active-active mode automatically balances all VDOMs. Remember the memory tip: "No cluster assignment means no load distribution"—if a VDOM isn't linked to a virtual cluster, it stays pinned to the primary, regardless of the HA mode.
NSE7 Enterprise Firewall and VDOMs Practice Question
This NSE7 practice question tests your understanding of enterprise firewall and vdoms. 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 has configured a FortiGate HA cluster with two units. The cluster uses a virtual cluster for load balancing in active-active mode. The administrator notices that traffic from one VDOM is not being load-balanced and is only handled by one unit. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VDOM is not assigned to any virtual cluster
In an active-active HA cluster with virtual clusters, each VDOM must be explicitly assigned to a virtual cluster to participate in load balancing. If a VDOM is not assigned to any virtual cluster, it defaults to being handled only by the primary unit, regardless of the cluster mode. This explains why traffic from that VDOM is not load-balanced.
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.
✗
Session pickup is disabled
Why it's wrong here
Session pickup is for session synchronization, not load balancing.
✗
The HA priority is set to 0 on the secondary unit
Why it's wrong here
Priority affects which unit becomes primary, not load balancing per VDOM.
✓
The VDOM is not assigned to any virtual cluster
Why this is correct
VDOMs must be assigned to a virtual cluster for load balancing.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The management interface is not configured on the VDOM
Why it's wrong here
Management interface is for administrative access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume active-active mode automatically load-balances all traffic across both units, overlooking the requirement that each VDOM must be explicitly assigned to a virtual cluster to enable load balancing for that VDOM.
Detailed technical explanation
How to think about this question
When virtual clusters are used in active-active mode, each VDOM must be bound to a specific virtual cluster (e.g., virtual-cluster-1 or virtual-cluster-2) via the 'set vdom' command under the HA configuration. If a VDOM is unassigned, it remains in the default virtual cluster, which is handled solely by the primary unit. This design allows granular control over which VDOMs are load-balanced and which are not, useful for asymmetric traffic patterns or regulatory requirements.
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.
Enterprise Firewall and VDOMs — This question tests Enterprise Firewall and VDOMs — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The VDOM is not assigned to any virtual cluster — In an active-active HA cluster with virtual clusters, each VDOM must be explicitly assigned to a virtual cluster to participate in load balancing. If a VDOM is not assigned to any virtual cluster, it defaults to being handled only by the primary unit, regardless of the cluster mode. This explains why traffic from that VDOM is not load-balanced.
What should I do if I get this NSE7 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This NSE7 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 NSE7 exam.
Question Discussion
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