NSE7 Troubleshooting and Diagnostics Practice Question
An administrator configured a firewall policy to inspect SMTP traffic using an antivirus profile. However, email attachments are not being scanned. The FortiGate is operating in proxy-based inspection mode. What is the most likely cause?
⚠ Common exam trap
It's easy for candidates to assume antivirus scanning fails due to encryption or policy action, but the NSE7 exam specifically tests the dependency on session helpers for protocol-level inspection in proxy mode.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The SMTP session helper is not enabled
In proxy-based inspection mode, the FortiGate must reassemble the SMTP session to scan attachments. The SMTP session helper is required to parse the SMTP commands and data stream so the antivirus engine can access the attachments. Without the helper enabled, the FortiGate treats the traffic as raw TCP and cannot extract MIME parts for scanning.
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 policy is set to 'accept' instead of 'deny'
Why it's wrong here
Accept/deny does not affect scanning; scanning is applied regardless of action.
- ✗
The email is sent over TLS encryption
Why it's wrong here
If encrypted, deep inspection would be needed, but the question does not mention encryption.
- ✗
The antivirus profile is set to flow-based inspection
Why it's wrong here
The question states proxy-based mode, so this is not the cause.
- ✓
The SMTP session helper is not enabled
Why this is correct
Correct. The SMTP helper ensures FortiGate understands the SMTP protocol and can inspect email attachments.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.