Understanding of functional and technical aspects of Troubleshooting basic hardware issues

The following will be discussed in this section:

• Understand the relationship between interfaces, trunks, VLANs and their status/statistics
• Indicate which logs would contain debugging information
• Given a log file, determine the nature of a hardware issue
• How to correlate the LCD message to message in the corresponding log file
• Given a possible issue, determine which log file entries to review
• How to locate the LCD on an F5 Platform
• How to identify which tasks the buttons on the LCD perform
• How to reboot an F5 platform into the EUD
• How to download output from the unit an EUD was run on
• How to interpret the output from an EUD and determine if the test passed or failed

Reference: https://support.education.f5.com/hc/en-us/articles/4403999362715-TMOS-Administration-201

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Understanding of functional and technical aspects of Troubleshooting Basic Virtual Server Connectivity Issues

The following will be discussed in this section:

• Determine if a virtual server is configured with the proper IP address configuration
• Determine if the virtual server is configured with the appropriate profiles
• Verify the pool member/node Ratio configuration
• Given a specific connectivity issue, isolate where the problem might be according to the processing order
• Understand the effects of health monitors on the status of pool members/nodes
• Understand how a packet is processed once it arrives at device (connection table, packet filters, etc.)
• Determine if a virtual server is configured for the proper listening port
• Determine which tools to use in order to diagnose the issue
• Understand the difference between the virtual servers status definitions
• Determine the state and availability of the pool member/node in question
• Use the appropriate tool to troubleshoot persistence
• Validate the expected persistence behavior
• Determine the state of a virtual server (offline, enabled, etc.)
• Verify the type of persistence profile assigned to the virtual server in question
• Differentiate between fallback and primary persistence
• Explain the concept of “persistence”
• Determine if the pool configuration has an effect on virtual server state
• Understand how a virtual server processes a request (most specific to least specific)
• Verify the pool member/node connection configuration and count

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