NSE7 Troubleshooting and Diagnostics Practice Question
An administrator runs 'diagnose debug application ipsmonitor -1' and sees repeated messages: 'IPS engine restarting'. What is the MOST likely cause of this behavior?
⚠ Common exam trap
It's easy for candidates to confuse 'IPS engine restarting' with general system overload or policy misconfiguration, but the specific debug output points directly to a process crash, which is almost always caused by memory exhaustion in the IPS engine heap.
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 IPS engine is running out of memory
The 'IPS engine restarting' message in the output of 'diagnose debug application ipsmonitor -1' indicates that the IPS engine process is crashing and being automatically restarted by the FortiGate's watchdog. The most common cause of IPS engine crashes is memory exhaustion, as the engine requires a dedicated memory heap to process signatures and sessions; when this heap is depleted, the engine terminates to prevent system instability.
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
Session exhaustion produces conserve mode and traffic drops, not repeated IPS engine restarts. Overload is tempting because resource pressure can destabilise daemons, but ipsmonitor restarts typically stem from IPS signature database or engine crashes, not concurrent session counts.
- ✓
The IPS engine is running out of memory
Why this is correct
Repeated 'IPS engine restarting' messages indicate the ipsmonitor process is repeatedly restarting the IPS engine because memory exhaustion triggers a crash-and-restart loop. Insufficient memory prevents the engine from completing initialisation, so it terminates and is relaunched, producing the recurring diagnostic output.
- ✗
The firewall policy is configured for flow-based inspection
Why it's wrong here
Flow-based inspection is a supported, stable mode and does not itself restart the IPS engine; proxy-based mode is chosen when full content inspection or protocol decoding is required. Flow mode suits high-throughput traffic where deep inspection is unnecessary. Repeated restarts instead indicate resource exhaustion or a malformed packet triggering a crash.
- ✗
The IPS signatures are outdated and need updating
Why it's wrong here
Outdated signatures cause detection gaps, not engine restarts; the ipsmonitor process reloads signatures without crashing. Signature updates are the routine fix when coverage lags new threats, so this is tempting for any IPS anomaly. The restart loop instead points to memory exhaustion or a crash-triggering configuration, which signature freshness cannot address.
Go deeper
Related to this question
About these practice questions
This NSE7 question is part of Courseiva's 718-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.