3.06 Troubleshoot F5 Technology to Address Functionality or Performance Issues 401 Practice Questions (Page 8)

Questions 36–40

1. 36application · medium

   An F5 administrator is troubleshooting a virtual server that is returning incorrect responses. The administrator suspects an iRule is modifying the HTTP response. Which log or tool should the administrator use to confirm the iRule is executing and what it is doing?

   • AThe packet capture on the client-side interface to see the response before it is modified.
   • BThe iRule log, which records messages from the 'log' command in the iRule.
   • CThe TMM error log to see if the iRule is causing a TMM crash.
   • DThe virtual server's statistics to see if the iRule is being invoked.
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2. 37expert · hard

   An F5 administrator is troubleshooting a virtual server that is intermittently returning 500 errors. The virtual server uses SSL termination, an ASM policy, and an iRule that modifies the HTTP header. The pool members are healthy and the load is normal. The administrator has reviewed the ASM logs and found no blocks. Which systematic troubleshooting step should the administrator take next to isolate the cause?

   • AReview the TMM CPU utilization to see if the SSL termination is causing a bottleneck.
   • BIncrease the SSL session cache size to improve SSL performance and reduce errors.
   • CDisable the iRule temporarily to see if the errors stop, isolating the iRule as the cause.
   • DCheck the pool member's health monitor to ensure it is not marking members down intermittently.
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4. 38foundation · easy

   Which command is used to view iRules associated with a virtual server?

   • Atmsh show sys performance
   • Btmsh list ltm virtual one
   • Ctmsh save sys config
   • Dtmsh list ltm pool
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5. 39application · medium

   An F5 administrator is investigating a sudden increase in rejected connections to a virtual server that terminates SSL. The pool members are healthy and the load is normal. Which log source would provide the most direct evidence of whether an ASM security policy is blocking the connections?

   • AThe packet filter log to see if the connections are dropped by a network firewall rule.
   • BThe SSL certificate error log for handshake failures.
   • CThe BIG-IP system log (/var/log/ltm) for TMM errors.
   • DThe ASM security policy enforcement log, which records blocked requests and the violating policy.
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6. 40application · medium

   Users are reporting that they are being logged out of an application intermittently. The application requires session persistence. The F5 administrator reviews the virtual server configuration and sees that the persistence profile is set to 'Source Address' with a timeout of 5 minutes. The pool has 10 members. What is the most likely cause of the intermittent logouts?

   • AThe virtual server is configured with a SNAT, which changes the client's source IP and breaks persistence.
   • BThe persistence timeout is too short, causing the session to be lost after 5 minutes of inactivity.
   • CThe pool members are being restarted, causing the persistence records to be lost.
   • DThe load balancing method is changing the pool member for each request, overriding persistence.
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