CCSM Advanced Firewall Troubleshooting Practice Question
An administrator is troubleshooting a Check Point Security Gateway that is dropping packets unexpectedly. The administrator runs 'fw ctl zdebug + drop' and sees the message 'dropped by fw_log: log buffer full'. What is the most appropriate next step to resolve this issue?
⚠ Common exam trap
The trap here is assuming that increasing the log buffer size or restarting services will solve the problem, when the real issue is often a bottleneck in log transmission or processing that must be diagnosed first.
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
✓
Check the connectivity and performance between the Security Gateway and the management/log server, and verify that the log server is not overloaded.
A full log buffer typically means the gateway cannot send logs to the management server quickly enough. This can be due to network latency, a busy log server, or a high log generation rate. Checking connectivity and performance between the gateway and the log server, and verifying the log server's load, directly addresses the likely causes and helps restore normal log flow without disrupting services.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Check the connectivity and performance between the Security Gateway and the management/log server, and verify that the log server is not overloaded.
Why this is correct
The 'log buffer full' message indicates that the gateway is generating logs faster than they can be transmitted to the management server or written to local disk. This often results from network issues, a busy log server, or a high volume of log-generating traffic. Verifying connectivity, latency, and log server load is the correct first step to identify why the buffer is filling and to prevent the drops.
- ✗
Restart the Check Point services on the gateway using 'cpstop; cpstart' to clear the log buffer and reset the logging subsystem.
Why it's wrong here
Restarting services will temporarily clear the buffer, but it is disruptive and does not resolve the root cause. The buffer will fill again if the underlying issue, such as a slow or unreachable log server, persists. This action also causes downtime and should be avoided unless absolutely necessary. Troubleshooting the log transmission path is a more appropriate and less disruptive approach.
- ✗
Disable logging for the affected traffic by modifying the Security Policy to remove the track option from the relevant rules.
Why it's wrong here
Removing the track option would stop logs for those rules, but it is a drastic measure that eliminates visibility and does not address the underlying cause of the buffer filling. It could also violate compliance requirements. The issue is likely a bottleneck in log transmission or processing, not the logging configuration itself, so disabling logging is not the appropriate fix.
- ✗
Increase the log buffer size by modifying the kernel parameter 'fw_log_buf_size' in $FWDIR/boot/modules/fwkern.conf.
Why it's wrong here
The kernel parameter 'fw_log_buf_size' does exist, but modifying it is not the standard or recommended solution for a full log buffer. The log buffer filling up usually indicates that logs are being generated faster than they can be written to disk or sent to the management server. Adjusting the buffer size may provide temporary relief but does not address the root cause, such as excessive logging or a communication issue with the log server.
Visual reference
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.