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F5 Networks F5CAB3 Exam - Topic 2 Question 9 Discussion
Topic #: 2
Application administrators are reporting that nodes different from those configured in the pool are selected. The use of an iRule is suspected. How can the BIG-IP Administrator check if an iRule is used for this traffic? (Pick the 2 correct responses below)
To determine if an iRule is influencing traffic for a specific Virtual Server, the administrator must verify the association between the Virtual Server object and any applied scripts. In the BIG-IP Configuration Utility (GUI), this association is found under the Resources tab of the specific Virtual Server. While there is an 'iRules' sub-menu under Local Traffic, checking the Virtual Server's Resources tab is the definitive way to see which specific rules are currently active and in what order they are being processed for that particular traffic flow.
From the Command Line Interface (CLI), the tmsh list /ltm virtual <virtual_server> command provides a full text-based output of the virtual server's configuration. If iRules are applied, they will appear within a 'rules { ... }' block in the command output. This is more effective than Option A, which only lists the contents of the iRule itself but does not show if or where it is applied. Option C is a common misconception; while some versions of the GUI have reorganized menus, the standard location for managing the association of profiles, policies, and iRules to a Virtual Server remains the 'Resources' section. By identifying the applied iRule, an administrator can then review the script logic---often containing commands like pool or node---to see if it is overriding the default pool selection based on specific HTTP headers, URI paths, or client IP addresses.
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