The answer is that the dropped sessions are UDP, not TCP, because session pickup on FortiGate only synchronizes TCP sessions by default. This limitation stems from the fact that UDP is a stateless protocol, so the firewall does not track UDP connection state in the same way it tracks TCP’s three-way handshake and sequence numbers; session pickup replicates the TCP session table to the standby unit, but UDP sessions are simply not included in that synchronization. On the Fortinet NSE 7 Advanced Security NSE7 exam, this concept tests your understanding of HA session synchronization behavior and is a common trap where administrators assume session pickup covers all protocols. A reliable memory tip is “TCP gets picked up, UDP gets dropped off”—if you see dropped sessions after a failover and session pickup is enabled, always suspect UDP traffic first.
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.
An administrator observes that after a failover in an HA cluster, some established sessions are dropped. The cluster is configured with session pickup enabled. What is the most likely reason for the dropped sessions?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Session pickup only synchronizes TCP sessions, and the dropped sessions are UDP
Session pickup synchronizes sessions between HA members, but if the session was established before the cluster was fully synchronized, or if the session table is full, sessions may be dropped. However, the most common reason is that session pickup only works for TCP sessions, not UDP or other protocols.
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 failover occurred during a configuration synchronization
Why it's wrong here
Configuration sync is separate from session sync. Session pickup operates independently.
✗
The HA uptime is less than the session TTL
Why it's wrong here
This is not directly relevant; session pickup should still work if configured correctly.
✓
Session pickup only synchronizes TCP sessions, and the dropped sessions are UDP
Why this is correct
Session pickup by default only synchronizes TCP sessions. UDP and other protocols are not preserved during failover.
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 session helper for the protocol is not enabled
Why it's wrong here
Session helpers are for ALG handling, not for session synchronization.
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.
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 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 NSE7 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.
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: Session pickup only synchronizes TCP sessions, and the dropped sessions are UDP — Session pickup synchronizes sessions between HA members, but if the session was established before the cluster was fully synchronized, or if the session table is full, sessions may be dropped. However, the most common reason is that session pickup only works for TCP sessions, not UDP or other protocols.
What should I do if I get this NSE7 question wrong?
Identify which NSE7 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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Question Discussion
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