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| Section | Objectives |
|---|---|
| Advanced Gateway Troubleshooting | - Traffic Drops and Status Errors - Kernel Debugging |
| Advanced Site-to-Site VPN Troubleshooting | - VPN Tunnel Failures - IKE and IPsec Debugging |
| Advanced Client-to-Site VPN Troubleshooting | - Mobile Access / SSL VPN debugging - Endpoint Security Client Issues |
| Advanced Firewall Kernel Debugging | - Packet Flow and Lifecycle - fw ctl debug and chain modules |
| Advanced Troubleshooting with Logs and Events | - Log Indexing and Searching - Log Shipping and Storage |
| Advanced Identity Awareness Troubleshooting | - Identity Collectors and PDPs - User/Computer Authentication issues |
| Advanced Access Control Troubleshooting | - Policy Installation Issues - Layer and Rule Base debugging |
| Introduction to Advanced Troubleshooting | - Troubleshooting Methodology and Tools |
| Advanced Management Server Troubleshooting | - Database Maintenance and Backups - Management Server Status and Processes |
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質問 # 54
What is the simplest and most efficient way to check all dropped packets in real time?
正解：B
解説：
The simplest and most efficient way to check all dropped packets in real time is C. fw ctl zdebug + drop in expert mode. This command is a shortcut command that sets the kernel debug flags to a predefined value and prints the debug output to the standard output. It is useful for general debugging of common issues, such as traffic drops, NAT, VPN, or clustering. It has a small buffer size and does not require additional steps to start or stop the debugging. However, it has some limitations, such as it cannot be used with SecureXL, it cannot filter the output by chain modules, and it cannot save the output to a file12.
The other commands are not as simple or efficient as the fw ctl zdebug + drop command. The command tail -f $FWDIR/log/fw.log |grep drop in expert mode will only show the drops that are logged in the fw.log file, which may not include all the drops that occur in the kernel. The command cat /dev/fw1/log in expert mode will show the raw binary data of the kernel debug buffer, which is not human-readable and may contain irrelevant information. The command Smartlog will show the drops that are indexed and stored in the SmartEvent database, which may not be in real time and may depend on the log server performance12.
1: https://sc1.checkpoint.com/documents/R81.10/WebAdminGuides/EN/CP_R81.10_AdvancedTechnicalReferenceGuide/html_frameset.htm 2: https://www.checkpoint.com/downloads/training/DOC-Training-Data-Sheet-CCTE-R81.10-V1.0.pdf The Check Point R81.20 Gaia Administration Guide describes fw ctl zdebug as a key troubleshooting tool for real-time packet analysis, particularly for drops. The CCTE R81.20 course emphasizes using fw ctl zdebug for kernel-level debugging, including monitoring dropped packets.
For precise details, refer to:
Check Point R81.20 Gaia Administration Guide, section on "fw ctl zdebug" (available via Check Point Support Center).
CCTE R81.20 Courseware, which covers advanced troubleshooting techniques for packet drops (available through authorized training partners).
質問 # 55
Troubleshooting issues with Mobile Access requires the following:
正解：A
質問 # 56
If the cpsemd process of SmartEvent has crashed or is having trouble coming up, then it usually indicates that
__________.
正解：A
解説：
cpsemd is the process responsible for logging into the SmartEvent GUI. Therefore, you need to check the status of this process and debug it, if necessary. Usually, the issue with the cpsemd process is that it is crashing, or not coming up. What causes this process to crash or not come up is that the PostgreSQL database is down. Therefore, in order to run the cpsemd process successfully, you need to run the PostgreSQL database successfully.
質問 # 57
Which type of NAT allows both incoming and outgoing connections?
正解：A
質問 # 58
After kernel debug with "fw ctl debug you received a huge amount of information It was saved in a very large file that is difficult to open and analyze with standard text editors Suggest a solution to solve this issue
正解：C
解説：
One possible solution to solve the issue of having a very large file that is difficult to open and analyze with standard text editors is to divide the debug information into smaller files. This can be done by using the fw ctl kdebug command with the -f, -o, -m, and -s options. The -f option means to write the debug output to a file instead of the screen. The -o option specifies the name of the output file. The -m option sets the maximum number of files to be created. The -s option sets the maximum size of each file in KB. For example, the command fw ctl kdebug -f -o debug -m 25 -s 1024 will create up to 25 files named debug.0, debug.1, ..., debug.24, each with a maximum size of 1024KB. This way, the debug information can be split into more manageable chunks that can be opened and analyzed more easily with standard text editors.
References:
* 1: How to use "fw ctl kdebug" command
* 2: How to debug Check Point firewalls
* 3: Check Point CLI Reference Card
質問 # 59
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