F5 Networks F5CAB5 Exam Dumps

This log entry indicates that multiple monitors are assigned to the pool member, and the member is failing one of them.

Understanding Monitor Logic: By default, if multiple monitors are assigned to a pool or pool member without a 'Minimum To Up' (Availability Requirement) setting, the system requires all monitors to pass for the member to be marked 'Up'.

Analyzing the Log: The log clearly states: [ /Common/http: up, /Common/http2: down; ... ]. This means the standard HTTP monitor is successful, indicating the member is serving HTTP traffic, but the http2 monitor has failed.

Conclusion: Since the http monitor is 'up' but the member as a whole is 'down,' we can conclude the member is successfully responding to standard HTTP requests but not HTTP2 requests. Therefore, the member is currently only serving standard HTTP traffic.

Troubleshooting failed SSL handshakes involves interpreting the resource limits defined by the system's license8888. The log message SSL transaction (TPS) rate limit reached indicates the BIG-IP is dropping SSL connections because it has exceeded its licensed 'Transactions Per Second' capacity. When analyzing stats to determine the correct license level, the administrator must focus on 'Client-side' SSL TPS. This represents the initial encrypted handshakes between users and the BIG-IP virtual servers91. In this scenario, the peak client-side demand is 1200 TPS. While the 800 server-side transactions represent re-encryption toward the backend, F5's primary SSL TPS license limits typically apply to the client-facing side of the traffic flow. Therefore, to resolve the intermittent connectivity issues and ensure the virtual server works reliably during peaks, the license must be upgraded to at least 1200 TPS949596969696.9798Confirming this peak via statistics andcomparing it to the current license is a standard troubleshooting step for SSL performance issues.

To manually verify a health monitor's 'Send String' from the BIG-IP command line, the curl utility is the preferred tool because it allows for custom header insertion.

Matching the Monitor String: The monitor string requires an HTTP/1.1 request which must include a 'Host' header. Option A correctly uses the --header (or -H) flag to pass Host: www.example.com to the specific IP and port of the pool member.

Troubleshooting Logic: If curl --header 'Host: www.example.com' 'http://10.10.3.75:8080/' returns a '200 OK' but the BIG-IP monitor still shows 'Down,' the administrator should check if the Receive String in the monitor configuration matches the output provided by curl.

Invalid Syntax: Option D is incorrect because it tries to append the hostname to the URI path, which the web server will likely reject with a '404 Not Found'. tracepath (Options B and C) is a path discovery tool similar to traceroute and cannot validate HTTP response content.

To utilize the F5 iHealth service, a BIG-IP Administrator must generate a diagnostic snapshot of the system known as a QKView file.

GUI Path: In the BIG-IP Configuration Utility (GUI), the QKView generation tool is located under System > Support.

Process: On the Support page, the user selects the 'New Support Snapshot' button. From there, they ensure 'QKView' is selected. Once the BIG-IP finishes collecting the data (which includes logs, configuration, and hardware statistics), the user can download the resulting .qkview file directly to their local machine.

iHealth Integration: This file is then uploaded to ihealth.f5.com. The Upgrade Advisor tool within iHealth specifically parses this QKView to check the current configuration against known bugs, hardware limitations, or syntax changes in the target TMOS version.

Evaluation of Other Options:

System > Configuration (Option B): This section contains general system settings like DNS, NTP, and SNMP, but does not contain diagnostic tools.

System > Software Management (Option C): This is where new TMOS images (.iso files) are uploaded and installed, but it is not used for generating diagnostic reports.

System > Archives (Option D): This is used to create and manage UCS (User Configuration Set) files, which are full system backups. While UCS files contain configuration, they do not contain the deep diagnostic logs and hardware stats required by iHealth for an Upgrade Advisor analysis.

In BIG-IP LTM, health monitors are used to determine if a pool member or node is 'Up' and capable of processing traffic. Based on the provided exhibit, the specific configuration setting causing this behavior is Manual Resume.

Manual Resume (Enabled/Yes): When the Manual Resume setting is set to Yes, it changes the default behavior of how a pool member returns to service. Under normal circumstances (Manual Resume set to No), once a pool member starts passing its health check again, the BIG-IP system automatically marks it as 'Up' and resumes sending traffic to it. However, with Manual Resume enabled, the system will continue to mark the pool member as 'Down' (or 'Unavailable') even after it passes the health check. It requires a manual intervention by an administrator to reset the status and allow traffic to flow again.

Exhibit Analysis: The screenshot clearly shows the Manual Resume radio button is selected as Yes. This explains why, even after the pool member 'starts passing the monitor checks,' it does not receive new traffic.

Incorrect Options Analysis:

Time Until Up (0 seconds): This setting defines how long a member must consistently pass health checks before being marked 'Up.' If it is set to 0, it should actually return to service immediately upon the first successful check.

The pool member is disabled: While a disabled member won't receive traffic, the question focuses on why passing a monitor check didn't restore service, which points specifically to the monitor configuration shown.

Monitor Type is TCP Half Open: This is simply the method used to check the service (sending a SYN and expecting a SYN-ACK, then sending a RST). It determines how the check is performed, not what happens after the check succeeds.

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