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IBM C9510-318 Exam Syllabus Topics:

IBM WebSphere Application Server Network Deployment V8.5, Core Administration Sample Questions:

1. A system administrator has just deployed a couple of new applications in a test environment. The administrator now notices a number of out-of-memory exceptions in the various log files. The administrator suspects that one or more of the newlyinstalled applications might contain a memory leak that is causing the out-of-memory exceptions. How can the system administrator further investigate the out-of-memory problems?

A) Use the Tivoli Performance Viewer Advisor and examine the memory leak advice.
B) Trigger a Javadump.
C) Install and use the Monitoring and Diagnostic Toolsfor Java.
D) Use the IBM Support Assistant Data Collector tool.

2. A system administrator observed a decreased performance of a web application. During investigation, the system administrator found that there were frequent garbage collections. A WebSphere Application Server is running on 32-bit platform with 8GB of memory, and with default settings for the JVM. What does the system administrator need to change to improve performance?

A) Change the garbage collection policy to "balanced".
B) Update the operating systemparameters to make more memory available for the JVM.
C) Increase the JVM maximum heap size and use the "balanced" garbage collection policy.
D) Increase the JVM maximum and the initial heap size.

3. A system administrator has created a dynamic cluster in a production environment. During the autonomic server start and stop operations, it was observed that the server is taking more time than normal and the administrator is always called for manual start/stop of the servers. What should the system administrator tune to avoid manual intervention?

A) On-demand configuration manager.
B) Health controller.
C) Application placement controller.
D) Dynamic workload controller.

4. A system administrator has configured a clustered environment where session persistence
is configured. While tuning the environment, the administrator enables verbose garbage collection. Now the administrator is seeing a high CPU usage for the servers in the cluster and begins seeing out-of-memory exceptions in the log files. How can the system administrator diagnose what is accumulating in the memory and causing the out-of-memory exceptions?

A) Disable verbose garbagecollection and compare the before and after verbose garbage collection statistics.
B) Examine the verbose garbage collection statistics in the SystemOut.log files.
C) Use the Garbage Collection and Memory Visualizer tool in the IBM Support Assistant.
D) Enable High Performance Extensible Logging (HPEL).

5. After deploying a new application to a high load production system, a memory leak has been detected which causes OutOfMemory exceptions. After fixing this, a system administrator needs to gather JVM heap dumps and restart the server in case a memory leak is detected in the future. How should the system administrator handle this without writing a script? Create a health policy which will:

A) use the Job Manager to put server in maintenance mode, gather JVM heap dump and restart the server.
B) take the server out of maintenance mode, gather JVM heap dump and restart the server.
C) put the server in maintenance mode, gather JVM heap dump and restart the server.
D) send the SNMP trap to generate the heap dump and restart the server.

Solutions: