Report Use of iRules F5CAB3 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   An administrator is writing an iRule that needs to set a variable to the value of a query string parameter. The iRule is: `when HTTP_REQUEST { set param_value [URI::query [HTTP::uri] "id"] }`. What is the purpose of the `URI::query` command in this context?

   • AIt removes the query string from the HTTP URI.
   • BIt extracts the value of the 'id' parameter from the query string of the HTTP URI.
   • CIt returns the entire query string as a single string.
   • DIt encodes the query string to make it safe for logging.
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2. 7foundation · easy

   What is a potential impact of a poorly written iRule on traffic management?

   • AIt can modify the BIG-IP's DNS settings.
   • BIt can change the MAC address of the BIG-IP's interfaces.
   • CIt can increase the BIG-IP's memory usage and CPU load, potentially degrading performance.
   • DIt can automatically update the BIG-IP's license.
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4. 8application · medium

   An iRule is not behaving as expected. The administrator suspects a variable is not being set correctly. Which debugging technique is most appropriate to confirm the variable's value at runtime?

   • ACheck the pool member's logs for the variable's value.
   • BReview the iRule's syntax in the configuration and look for TCL errors.
   • CUse the `tmsh show ltm rule` command to display the variable's value.
   • DAdd a `log local0. "Variable value: $myvar"` statement at the point in the iRule where the variable is used.
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5. 9foundation · easy

   How can you verify that an iRule is associated with a virtual server?

   • ABy checking the iRule's log entries in /var/log/ltm.
   • BBy checking the pool's member status in the BIG-IP GUI.
   • CBy pinging the virtual server's IP address from a client.
   • DBy viewing the virtual server's properties in the BIG-IP configuration utility, which lists the attached iRules.
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6. 10foundation · easy

   In the context of F5 BIG-IP, what does an iRule primarily operate on?

   • AThe BIG-IP management plane, including GUI and CLI settings.
   • BThe underlying hardware resources, such as CPU and memory allocation.
   • CThe traffic passing through a virtual server, allowing inspection and modification.
   • DThe BIG-IP configuration database and system logs.
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