The answer is that traffic matches a different policy without the application control profile, or the policy uses proxy-based inspection mode. These two reasons explain why application control fails to inspect traffic on FortiGate because the FortiGate processes traffic based on the first matching policy in its sequence; if a preceding policy lacks the application control profile, the traffic bypasses inspection entirely. Additionally, when a policy is configured for proxy-based inspection mode, application control may not function correctly as it relies on flow-based inspection to identify application signatures in real time. On the Fortinet NSE 7 Advanced Security NSE7 exam, this question tests your understanding of policy order and inspection modes, a common trap being that administrators assume all traffic is inspected once a profile is applied anywhere. A helpful memory tip is “first match wins, proxy kills apps” — meaning the first policy matched dictates inspection, and proxy mode can disable application control.
NSE7 Troubleshooting and Diagnostics Practice Question
This NSE7 practice question tests your understanding of troubleshooting and diagnostics. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 notices that some traffic through the FortiGate is not being inspected by the application control profile. Which TWO reasons could explain this? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The inspection mode is set to proxy-based
Options B and D are correct. If the policy uses proxy-based inspection mode (B), application control may not work correctly. If the traffic matches a policy before the one with the profile (D), it bypasses inspection. Option A is irrelevant. Option C would affect all traffic, not some. Option E is not a reason.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 inspection mode is set to proxy-based
Why this is correct
Application control works only in flow-based mode.
Related concept
Static NAT maps one inside address to one outside address.
✗
The application control signatures are outdated
Why it's wrong here
Outdated signatures would still inspect, though less accurately.
✗
The FortiGate has high memory usage
Why it's wrong here
High memory may cause issues but not selectively.
✗
The application control profile is disabled
Why it's wrong here
If disabled, no traffic would be inspected, not just some.
✓
Traffic matches a different policy without the application control profile
Why this is correct
Policy matching is first-match, so earlier policy may apply.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related NSE7 NAT questions on configuration and troubleshooting.
Troubleshooting and Diagnostics — This question tests Troubleshooting and Diagnostics — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The inspection mode is set to proxy-based — Options B and D are correct. If the policy uses proxy-based inspection mode (B), application control may not work correctly. If the traffic matches a policy before the one with the profile (D), it bypasses inspection. Option A is irrelevant. Option C would affect all traffic, not some. Option E is not a reason.
What should I do if I get this NSE7 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related NSE7 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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