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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? (Choose two answers)
Correct Answer: B,C
In BIG-IP systems, iRules influence traffic only when they are attached to a Virtual Server. If application traffic is being sent to nodes or pool members that are not defined in the pool, this typically indicates that an iRule is overriding the default load-balancing behavior by explicitly selecting a pool or node. According to BIG-IP Administration: Data Plane Configuration and official F5 guidance: iRules are associated with Virtual Servers, not directly with pools or nodes. To determine whether an iRule is actively affecting traffic, the administrator must inspect the Virtual Server configuration. Explanation of the correct answers: B . Via the GUI at the Resources tab for the virtual server The Resources tab in the Configuration Utility displays all traffic-handling objects applied to the Virtual Server, including assigned iRules. This is the primary GUI location to verify whether an iRule is influencing data plane traffic. C . Via TMSH with the list /ltm virtual <virtual_server> command This TMSH command displays the full Virtual Server configuration, including any iRules listed under the rules section. It is the authoritative CLI method to confirm iRule usage. Why the other options are incorrect: A . Via TMSH with the list /ltm rule <irule> command This command only shows the contents of an iRule and does not indicate whether the iRule is attached to or used by any Virtual Server. D . Via the GUI at the iRule tab for the virtual server BIG-IP does not provide a dedicated "iRule" tab on Virtual Servers. iRules are viewed and managed under the Resources tab. Correct Conclusion: To verify whether an iRule is responsible for unexpected node selection, the BIG-IP Administrator must examine the Virtual Server configuration, either through the Resources tab in the GUI or by using TMSH to list the Virtual Server configuration.
