Quick Answer
The answer is active-passive HA mode. This is correct because in a FortiGate high availability cluster operating in active-passive mode, only one unit assumes the primary role to actively process traffic, while the other unit remains in standby, ready to take over only if the primary fails. The administrator observed exactly this behavior—one unit labeled as primary and the other as standby—with no load balancing configured, which is the defining characteristic of active-passive HA. On the Fortinet NSE 4 Network Security Professional exam, this question tests your ability to distinguish between active-passive and active-active HA modes based on role labels and traffic distribution. A common trap is assuming that any two-unit cluster must be load-balanced; remember that active-active requires explicit load balancing configuration and both units showing as primary. For a quick memory tip, think “one active, one passive—no sharing, just standing by.”
This NSE4 practice question tests your understanding of high availability and diagnostics. 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 notices that the FortiGate HA cluster has two units, but only one is shown as 'primary' and the other as 'standby'. The administrator did not configure any load balancing. Which HA mode is in use?
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.
Active-passive
Active-passive uses primary/standby roles.
Load-balanced cluster
Why wrong: This is not a standard HA mode; active-active with load balancing is a variant.
Standalone
Why wrong: Standalone is not an HA mode.
Active-active
Why wrong: Active-active has both units actively processing traffic.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Active-passive
In active-passive HA, one unit is primary (active) and the other is standby (passive).
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.
Active-passive
Why this is correct
Active-passive uses primary/standby roles.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Load-balanced cluster
Why it's wrong here
This is not a standard HA mode; active-active with load balancing is a variant.
Standalone
Why it's wrong here
Standalone is not an HA mode.
Active-active
Why it's wrong here
Active-active has both units actively processing traffic.
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.
High Availability and Diagnostics — study guide chapter
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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: Active-passive — In active-passive HA, one unit is primary (active) and the other is standby (passive).
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.
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Last reviewed: Jun 21, 2026
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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