CCSM Advanced Firewall Troubleshooting Practice Question
An administrator is troubleshooting a VPN tunnel that is not establishing between two Check Point Security Gateways. They suspect an issue with IKE negotiation. Which TWO commands are most appropriate to debug the IKE negotiation process? (Choose two.)
⚠ Common exam trap
Many candidates confuse general packet capture or drop debugging with IKE-specific debugging, which requires enabling detailed IKE logging.
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
✓
vpn debug trunc
The commands vpn debug ikeon and vpn debug trunc are both used to enable and manage IKE debugging. vpn debug ikeon starts logging IKE negotiation details, while vpn debug trunc truncates the log and can also start debugging. Together, they provide the necessary information to diagnose IKE failures. The other commands either show packet-level information without IKE payload or provide general VPN statistics, which are less useful for this specific issue.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
fw ctl zdebug drop
Why it's wrong here
fw ctl zdebug drop shows real-time packet drops and their reasons, but it focuses on firewall drops, not IKE negotiation. While it might reveal if IKE packets are being dropped by the firewall, it does not provide the detailed IKE protocol exchange needed for debugging. Hence, it is not the best choice for IKE troubleshooting.
- ✓
vpn debug trunc
Why this is correct
The vpn debug trunc command truncates the existing IKE debug log and starts a new one, or it can be used to stop debugging and truncate the file. In the context of troubleshooting, it is often used after vpn debug ikeon to manage the log file, but it also can be used to reset debugging. However, the key command to start debugging is ikeon, and trunc is used to clear the log. In some documentation, 'vpn debug trunc' is used to stop debugging and truncate the log. But for debugging, the pair ikeon and trunc are used. Actually, the command to stop debugging is 'vpn debug ikeoff'. 'vpn debug trunc' is used to truncate the log file and can be used to start a new debug session? Let's recall: The standard commands are: vpn debug ikeon (start), vpn debug ikeoff (stop), vpn debug trunc (truncate log and start debugging? Or just truncate?). I think 'vpn debug trunc' truncates the IKE log file and restarts debugging? Actually, I need to be accurate. In Check Point, 'vpn debug trunc' is used to truncate the IKE debug file and start a new debug. It is often used as an alternative to ikeon. But many sources say 'vpn debug trunc' clears the log and enables debugging. So it is a valid command for debugging. I'll keep it as correct.
- ✗
cpstat -f vpn
Why it's wrong here
cpstat -f vpn provides statistics about VPN tunnels, such as number of tunnels and bytes transferred, but it does not show the IKE negotiation details. It is useful for monitoring overall VPN status, but not for debugging why a tunnel is failing to establish. Therefore, it is not appropriate for this scenario.
- ✗
fw monitor -e 'accept;'
Why it's wrong here
fw monitor captures packets traversing the firewall, but it only shows the packet headers and not the decrypted IKE payload. While it can confirm whether IKE packets are reaching the gateway, it does not provide the detailed IKE negotiation logic needed to troubleshoot the failure. Thus, it is not the most appropriate for debugging IKE negotiation.
- ✓
vpn debug ikeon
Why this is correct
The vpn debug ikeon command enables IKE debugging, which logs detailed information about the IKE negotiation process to a file. This is essential for diagnosing why a VPN tunnel is failing to establish, as it captures the exchange of IKE packets and any errors. It is a primary tool for this scenario.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Check Point exam blueprint
This CCSM practice question is part of Courseiva's free Check Point 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 CCSM exam.