The answer is to enable FortiSandbox in the antivirus profile and set the action for unknown files to Block. This configuration is correct because when FortiGate encounters a file its local antivirus engine cannot classify, it submits that file to FortiSandbox for analysis while simultaneously blocking it from reaching the endpoint. The file remains blocked until FortiSandbox returns a verdict—either clean or malicious—ensuring no potentially harmful content is delivered during the analysis window. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your understanding of how FortiGate integrates with FortiSandbox to handle unknown threats, often appearing as a configuration-based question where a common trap is confusing the Block action with Monitor, which would allow the file through pending analysis. Remember the key distinction: Block means “hold until verdict,” while Monitor means “allow and check later.” A useful memory tip is “Block the unknown, wait for the verdict,” reinforcing that the file is quarantined until FortiSandbox finishes its assessment.
NSE7 Advanced Threat Protection Practice Question
This NSE7 practice question tests your understanding of advanced threat protection. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 administrator notices that traffic classified as 'unknown' by the antivirus is being allowed. The administrator wants to ensure that such files are submitted to FortiSandbox for analysis and blocked until a verdict is received. Which configuration is required?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable FortiSandbox in the antivirus profile and set 'Action for unknown files' to 'Block'
Option B is correct because when FortiSandbox is enabled in the antivirus profile and 'Action for unknown files' is set to 'Block', the FortiGate will submit files that cannot be identified by the local antivirus engine to FortiSandbox for analysis. While the file is being analyzed, it is blocked from reaching the client, ensuring that no potentially malicious content is delivered until a verdict (clean or malicious) is received. This directly addresses the administrator's requirement to block unknown files pending sandbox analysis.
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.
✗
Create a custom IPS signature for unknown files
Why it's wrong here
IPS does not handle file submission to FortiSandbox.
✓
Enable FortiSandbox in the antivirus profile and set 'Action for unknown files' to 'Block'
Why this is correct
This configuration submits unknown files to FortiSandbox and blocks them until a verdict is returned.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable outbreak prevention in the antivirus profile
Why it's wrong here
Outbreak prevention uses machine learning but does not submit to FortiSandbox.
✗
Enable FortiSandbox in the antivirus profile and set 'Action for known files' to 'Block'
Why it's wrong here
That blocks known malicious files, not unknown.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'Action for unknown files' with 'Action for known files' or mistakenly think that outbreak prevention (which uses FortiGuard outbreak signatures) is sufficient to block unknown files, when in fact only the sandbox integration with the 'Block' action provides the required submission and blocking behavior.
Detailed technical explanation
How to think about this question
When FortiSandbox is enabled in the antivirus profile, the FortiGate uses the 'av-sandbox' feature to send files that are not recognized by the local antivirus signatures (i.e., 'unknown' classification) to the FortiSandbox appliance or cloud service. The 'Action for unknown files' setting controls the disposition of these files during the analysis period: 'Block' means the file is denied until a verdict is returned, while 'Allow' would permit the file to pass through immediately. The FortiGate caches the verdict from FortiSandbox to avoid re-submitting the same file, and the administrator can configure a fallback action if the sandbox is unreachable.
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.
Advanced Threat Protection — This question tests Advanced Threat Protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable FortiSandbox in the antivirus profile and set 'Action for unknown files' to 'Block' — Option B is correct because when FortiSandbox is enabled in the antivirus profile and 'Action for unknown files' is set to 'Block', the FortiGate will submit files that cannot be identified by the local antivirus engine to FortiSandbox for analysis. While the file is being analyzed, it is blocked from reaching the client, ensuring that no potentially malicious content is delivered until a verdict (clean or malicious) is received. This directly addresses the administrator's requirement to block unknown files pending sandbox analysis.
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.
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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