The answer is that config sync is not enabled, which is the most likely cause when a secondary unit lacks the latest configuration after a FortiGate HA failover. Config sync is the mechanism that replicates all configuration changes from the primary unit to the secondary unit in real time; without it, the secondary unit never receives updates, so when it assumes the primary role during a failover, it operates with an outdated or default configuration. On the Fortinet NSE 7 Advanced Security NSE7 exam, this concept tests your understanding of HA cluster synchronization fundamentals, often appearing as a trap where candidates mistakenly blame session synchronization or link failover instead. Remember that session sync handles active sessions, while config sync handles persistent settings—a common pitfall is confusing the two. A useful memory tip: “Config sync copies the blueprint, session sync copies the blueprint’s current use.”
NSE7 Enterprise Firewall and VDOMs Practice Question
This NSE7 practice question tests your understanding of enterprise firewall and vdoms. 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.
During a failover test in an HA cluster, the administrator observes that the secondary unit becomes primary but does not have the latest configuration. 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
✓
Config sync is not enabled
Config sync is the mechanism that replicates configuration changes from the primary unit to the secondary unit in a FortiGate HA cluster. If config sync is not enabled, the secondary unit will not receive configuration updates, so when it becomes primary after a failover, it will operate with an outdated or default configuration. This directly explains why the secondary unit lacks the latest configuration after the failover.
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 password encryption is mismatched
Why it's wrong here
Password encryption mismatch would cause authentication issues, not config sync failure.
✓
Config sync is not enabled
Why this is correct
Config sync must be enabled to replicate configuration changes.
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.
✗
The HA priority is set too low
Why it's wrong here
Priority determines which unit becomes primary but does not affect config sync.
✗
session-pickup is disabled
Why it's wrong here
session-pickup is for session failover, not config sync.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse session-pickup (which handles session state) with config sync (which handles configuration replication), leading them to incorrectly select option D when the actual issue is the missing config sync mechanism.
Detailed technical explanation
How to think about this question
Config sync in FortiGate HA uses TCP port 703 (by default) to replicate the entire configuration database from the primary to the secondary unit(s). The synchronization is triggered by configuration changes on the primary and is independent of HA priority or session-pickup settings. In a real-world scenario, if an administrator forgets to enable config sync during initial HA setup, a failover will result in the new primary running a stale configuration, potentially causing network outages or security policy mismatches.
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 practitioner preparing for the NSE7 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Enterprise Firewall and VDOMs — This question tests Enterprise Firewall and VDOMs — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Config sync is not enabled — Config sync is the mechanism that replicates configuration changes from the primary unit to the secondary unit in a FortiGate HA cluster. If config sync is not enabled, the secondary unit will not receive configuration updates, so when it becomes primary after a failover, it will operate with an outdated or default configuration. This directly explains why the secondary unit lacks the latest configuration after the failover.
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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Question Discussion
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