The answer is the IPS engine is running out of memory. When you run the command `diagnose debug application ipsmonitor -1` and see repeated "IPS engine restarting" messages, it directly indicates that the engine is being killed and restarted by the system due to memory exhaustion. The IPS engine processes traffic in a resource-constrained environment, and if it exceeds its allocated memory threshold—often due to a large number of concurrent sessions or complex signature matches—the FortiGate’s watchdog mechanism forces a restart to reclaim resources and prevent a full system crash. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your understanding of IPS resource management and the difference between a configuration error and a runtime failure; a common trap is to suspect a policy misconfiguration or a corrupted signature database, but the repeated restart pattern is a classic sign of memory pressure. Remember the mnemonic: "Restart Reclaims RAM"—if you see the engine restarting, think memory first.
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.
An administrator runs 'diagnose debug application ipsmonitor -1' and sees repeated messages: 'IPS engine restarting'. What is the MOST likely cause of this behavior?
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
✓
The IPS engine is running out of memory
Option A is correct. IPS engine restarts often indicate memory exhaustion or a crash. High memory usage can force the engine to restart to reclaim resources.
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 FortiGate is overloaded with too many concurrent sessions
Why it's wrong here
High session count might cause performance issues but not specifically IPS engine restarts.
✓
The IPS engine is running out of memory
Why this is correct
Memory exhaustion causes the IPS engine to restart to free resources.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The firewall policy is configured for flow-based inspection
Why it's wrong here
Flow-based inspection uses the IPS engine, but that alone doesn't cause restarts.
✗
The IPS signatures are outdated and need updating
Why it's wrong here
Outdated signatures would not cause engine restarts.
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 IPS engine is running out of memory — Option A is correct. IPS engine restarts often indicate memory exhaustion or a crash. High memory usage can force the engine to restart to reclaim resources.
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.
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?
Static NAT maps one inside address to one outside address.
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