Quick Answer
The answer is that the primary immediately takes over as active. This occurs because HA override is enabled on the cluster, meaning the FortiGate unit with the higher priority—in this case, the primary with priority 200—will preempt the secondary (priority 100) as soon as it recovers and rejoins the cluster. The override setting forces an immediate failback to the higher-priority device, overriding the default behavior where the active unit remains unchanged unless it fails again. On the Fortinet NSE 4 Network Security Professional exam, this scenario tests your understanding of HA preemption logic, often appearing as a trap where candidates mistakenly think the primary waits or that a manual intervention is required. Remember the key distinction: without override, the recovered primary stays passive; with override, it seizes the active role instantly. A simple memory tip is “Override = Overrule the standby,” meaning the higher priority always reclaims control.
This NSE4 practice question tests your understanding of high availability and diagnostics. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 HA override on a cluster with priority 200 on primary and 100 on secondary. The primary fails, secondary takes over. When primary recovers, what happens?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Both units become active, causing a conflict
Why wrong: HA prevents split-brain.
Secondary remains active until next failover
Why wrong: Override causes preemption.
The administrator must manually trigger failback
Why wrong: Override automates failback.
Primary immediately takes over as active
Override enables preemption: when the higher priority unit recovers, it becomes active.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Primary immediately takes over as active
With HA override enabled, the higher priority unit (primary) will preempt the secondary upon recovery, assuming it has higher priority.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Both units become active, causing a conflict
Why it's wrong here
HA prevents split-brain.
Secondary remains active until next failover
Why it's wrong here
Override causes preemption.
The administrator must manually trigger failback
Why it's wrong here
Override automates failback.
Primary immediately takes over as active
Why this is correct
Override enables preemption: when the higher priority unit recovers, it becomes active.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the NSE4 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which NSE4 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
High Availability and Diagnostics — This question tests High Availability and Diagnostics — Read the scenario before looking for a memorised answer..
The correct answer is: Primary immediately takes over as active — With HA override enabled, the higher priority unit (primary) will preempt the secondary upon recovery, assuming it has higher priority.
Identify which NSE4 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
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 is configuring a FortiGate HA cluster and wants to ensure that the primary unit is always preferred based on its configuration priority. Which setting should be enabled to allow the primary unit to resume its role after a failover if it regains connectivity?
mediumWhy B: Option C is correct. The HA override setting allows a higher-priority unit to take over the primary role when it rejoins the cluster after a failure, even if it was previously secondary.
Last reviewed: Jun 21, 2026
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