The answer is to enable the override setting with 'set override enable' under config system ha. This is required because, by default, FortiGate HA operates in a non-preemptive mode, meaning that once a secondary unit takes over as primary—even after a reboot of the original primary with a higher priority—it will not automatically relinquish its role. The override command forces the cluster to preempt the current primary and restore the higher-priority unit as the active master upon its recovery, ensuring the designated primary always remains preferred unless it fails. On the Fortinet NSE 4 exam, this concept tests your understanding of HA preemption behavior, often appearing as a trap where candidates assume priority alone dictates master election without considering the override flag. A common memory tip is to think of "override" as the "take-back" switch: without it, the cluster is "set it and forget it," but with it, the primary can reclaim its throne.
NSE4 High Availability and Diagnostics Practice Question
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 needs to ensure that in an active-passive HA cluster, the primary unit always remains the preferred master unless it fails, regardless of other factors. The administrator sets the primary's HA priority to 200 and the secondary to 100. However, after a reboot of the primary, the secondary becomes the primary. What additional step is required?
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.
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set 'set override enable' under config system ha
In HA, the 'override' setting (or 'set override enable') ensures that when the primary recovers, it will preempt the current primary and become active again. Without override, the cluster uses a non-preemptive mode: once a unit becomes primary, it stays primary even if a higher-priority unit comes back online.
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.
✗
Set 'set ha-mgmt-status enable' on the primary
Why it's wrong here
This enables management interface, not related to failback.
✗
Reduce the secondary priority to 0
Why it's wrong here
Still without override, the secondary will not give up mastership.
✗
Increase the primary priority to 255
Why it's wrong here
Higher priority is already set, but without override, the cluster will not switch back.
✓
Set 'set override enable' under config system ha
Why this is correct
Enabling override tells HA to actively switch back to the highest priority unit when it recovers. Without override, the cluster does not preempt.
Clue confirmation
The clue words "primary", "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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
Got this wrong? Here's your next step.
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.
High Availability and Diagnostics — This question tests High Availability and Diagnostics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set 'set override enable' under config system ha — In HA, the 'override' setting (or 'set override enable') ensures that when the primary recovers, it will preempt the current primary and become active again. Without override, the cluster uses a non-preemptive mode: once a unit becomes primary, it stays primary even if a higher-priority unit comes back online.
What should I do if I get this NSE4 question wrong?
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.
Are there clue words in this question I should notice?
Yes — watch for: "primary", "always". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
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 →
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. A FortiGate cluster in active-passive HA is configured with two heartbeat interfaces. The primary unit fails completely. The secondary unit detects the failure and becomes primary. After the original primary recovers, it remains in passive mode. What is the most likely reason for this behavior?
medium
A.The heartbeat interfaces are not properly configured
✓ B.The HA override setting is disabled
C.The priority of the original primary is lower than the current primary
D.The HA override setting is enabled
Why B: When override is disabled (the default), the recovered unit will not preempt the current primary. The cluster stays with the current primary until it fails. This is the expected behavior for graceful recovery.
Last reviewed: Jun 21, 2026
Question Discussion
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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.
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