The answer is that the configuration has not been saved on the primary unit. This is the most likely cause of a FortiGate HA synchronization failure because the HA cluster requires a committed configuration—written to flash via the `execute backup config` or `write memory` command—before the primary can push changes to the secondary. Without a saved configuration, the primary unit has no stable baseline to synchronize, so the HA status shows 'synchronization failed' even when the cluster heartbeat and link health are normal. On the Fortinet NSE 7 Advanced Security NSE7 exam, this question tests your understanding that HA synchronization is a two-step process: save first, then sync. A common trap is assuming that live CLI changes are automatically replicated, but FortiGate HA only synchronizes saved configurations. Remember the memory tip: "No save, no sync"—if you see a synchronization failure with an otherwise healthy cluster, always check that the primary’s config has been committed to memory.
NSE7 Troubleshooting and Diagnostics Practice Question
This NSE7 practice question tests your understanding of troubleshooting 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.
A FortiGate is set up in a high availability (HA) cluster. The administrator notices that the primary unit is not synchronizing configuration changes to the secondary unit. The HA status shows 'synchronization failed'. 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.
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The configuration has not been saved on the primary unit.
Option D is correct because FortiGate HA requires the configuration to be saved (via 'execute backup config' or 'write memory') on the primary unit before it can be synchronized to the secondary unit. If the configuration is not saved, the primary unit does not have a committed configuration to push, leading to a 'synchronization failed' status even though the HA cluster is otherwise healthy.
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 firmware versions are different on the two units.
Why it's wrong here
Firmware mismatch would prevent HA from forming at all.
✗
The HA heartbeat interface is down.
Why it's wrong here
A down heartbeat interface would cause cluster split, not just sync failure.
The configuration has not been saved on the primary unit.
Why this is correct
HA sync only occurs after the configuration is saved; unsaved changes are not synchronized.
Clue confirmation
The clue words "most likely", "primary" 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
The trap here is that candidates often assume HA synchronization issues are always caused by network or heartbeat problems, overlooking the fundamental requirement that the configuration must be saved before it can be synchronized.
Detailed technical explanation
How to think about this question
FortiGate HA uses a proprietary synchronization mechanism that only transmits the running configuration after it has been saved to flash (the 'config' file). The 'execute ha synchronize start' command can force a sync, but it still requires a saved configuration on the primary. In real-world scenarios, administrators often make changes in the CLI without using 'end' or 'write memory', causing the secondary unit to remain out of sync until the configuration is committed.
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.
Troubleshooting and Diagnostics — This question tests Troubleshooting and Diagnostics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The configuration has not been saved on the primary unit. — Option D is correct because FortiGate HA requires the configuration to be saved (via 'execute backup config' or 'write memory') on the primary unit before it can be synchronized to the secondary unit. If the configuration is not saved, the primary unit does not have a committed configuration to push, leading to a 'synchronization failed' status even though the HA cluster is otherwise healthy.
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", "primary". 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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