The answer is that the HA override setting being disabled is the most likely cause of the failover issue. In a FortiGate active-passive cluster, when both units have equal priority, the primary is determined by the lower serial number, not by priority alone—so equal priorities do not inherently block failover. The real problem arises because, with the override setting disabled, a secondary unit cannot preempt or take over from the primary during a failure, even if the primary goes down; the cluster remains stuck. This concept is frequently tested on the Fortinet NSE 4 exam as a common trap—students often assume equal priorities cause the issue, but the exam wants you to recognize that failover still occurs unless override is turned off. A useful memory tip: think of “override” as the permission slip that lets the backup step up when the leader falters; without it, equal priorities mean nobody can take charge.
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.
A network administrator is troubleshooting a FortiGate HA cluster that is not failing over as expected. The cluster consists of two units in active-passive mode. The administrator issues the command 'diagnose sys ha status' and sees that both units have the same priority. What is the most likely cause of the failover issue?
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.
With override disabled, a secondary unit with lower priority cannot preempt the primary after a failback. The primary must fail completely for a failover to occur.
B
The HA mode is set to active-active instead of active-passive
Why wrong: Active-active would still fail over, and the status would show different roles.
C
The session pickup feature is enabled
Why wrong: Session pickup does not affect failover triggering.
D
The HA heartbeat interfaces are not properly connected
Why wrong: Heartbeat connectivity would cause split-brain or communication loss, not a failover failure due to priority.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The HA override setting is disabled
In active-passive HA, the unit with the higher priority (lower number) becomes primary. If priorities are equal, the primary is determined by serial number. Equal priorities do not prevent failover; the issue is likely that the override setting is disabled, so a lower-priority unit cannot take over even if the primary fails unless override is enabled.
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.
✓
The HA override setting is disabled
Why this is correct
With override disabled, a secondary unit with lower priority cannot preempt the primary after a failback. The primary must fail completely for a failover to occur.
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 HA mode is set to active-active instead of active-passive
Why it's wrong here
Active-active would still fail over, and the status would show different roles.
✗
The session pickup feature is enabled
Why it's wrong here
Session pickup does not affect failover triggering.
✗
The HA heartbeat interfaces are not properly connected
Why it's wrong here
Heartbeat connectivity would cause split-brain or communication loss, not a failover failure due to priority.
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.
Trap categories for this question
Command / output trap
Active-active would still fail over, and the status would show different roles.
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: The HA override setting is disabled — In active-passive HA, the unit with the higher priority (lower number) becomes primary. If priorities are equal, the primary is determined by serial number. Equal priorities do not prevent failover; the issue is likely that the override setting is disabled, so a lower-priority unit cannot take over even if the primary fails unless override is enabled.
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: "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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