The answer is local-in traffic exclusion. This is the most likely cause of an HA session synchronization mismatch because FortiGate A-P clusters only synchronize sessions that traverse the cluster, not sessions destined to the cluster’s own IP addresses. Local-in traffic—such as management sessions for HTTPS, SSH, or SNMP—is inherently unit-specific and never replicated to the secondary unit, so the primary will always show a higher session count when you run diagnose sys ha session-sync status. On the Fortinet NSE 7 Advanced Security NSE7 exam, this concept tests your understanding of HA session synchronization boundaries; a common trap is assuming all sessions are synchronized, but the key exception is any traffic that terminates on the FortiGate itself. Remember the memory tip: “Local-in stays local—it never syncs.”
NSE7 Troubleshooting and Diagnostics Practice Question
This NSE7 practice question tests your understanding of troubleshooting and diagnostics. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 cluster (A-P) has a session that is not synchronizing to the secondary unit. The administrator runs 'diagnose sys ha session-sync status' and sees that the session count is different between primary and secondary. Which 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 session was created by a local-in traffic (e.g., management traffic) which is not synchronized.
FortiGate A-P clusters synchronize sessions via the HA heartbeat interface, but local-in traffic (e.g., management sessions like HTTPS, SSH, or SNMP) is never synchronized because it is destined to the cluster IP itself and is inherently unit-specific. The 'diagnose sys ha session-sync status' command shows a session count mismatch because the primary unit has local-in sessions that the secondary does not replicate, making D the correct answer.
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 session is using a custom application control profile that prevents synchronization.
Why it's wrong here
Application control profiles do not affect session sync.
✗
The HA heartbeat interface is down.
Why it's wrong here
If heartbeat is down, no synchronization would occur at all.
✗
The secondary unit has insufficient memory to accept new sessions.
Why it's wrong here
Memory issues would cause more widespread problems.
✓
The session was created by a local-in traffic (e.g., management traffic) which is not synchronized.
Why this is correct
Local-in sessions are typically not synced across HA members.
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 assume all sessions are synchronized by default, but FortiGate explicitly excludes local-in traffic (management sessions) from HA synchronization, so a session count difference is normal and expected for those sessions.
Detailed technical explanation
How to think about this question
Local-in traffic is handled by the kernel's local-in chain and is not subject to session synchronization because it does not traverse the data plane in the same way as forwarded traffic. FortiGate HA uses the session synchronization daemon (hasync) to replicate session entries via UDP on the heartbeat interface, but local-in sessions are explicitly excluded to avoid unnecessary overhead and because each unit must independently manage its own control-plane sessions. In a real-world scenario, an administrator might see a session count difference of exactly one or two sessions, often corresponding to their own SSH or HTTPS management session to the cluster IP.
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.
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 session was created by a local-in traffic (e.g., management traffic) which is not synchronized. — FortiGate A-P clusters synchronize sessions via the HA heartbeat interface, but local-in traffic (e.g., management sessions like HTTPS, SSH, or SNMP) is never synchronized because it is destined to the cluster IP itself and is inherently unit-specific. The 'diagnose sys ha session-sync status' command shows a session count mismatch because the primary unit has local-in sessions that the secondary does not replicate, making D the correct answer.
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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