Tracing in .NET CASENET Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   What is the purpose of a TraceSwitch in .NET tracing?

   • AIt formats trace messages into a standard structure.
   • BIt controls the verbosity of trace output by allowing or suppressing messages based on a severity level.
   • CIt redirects trace output to a different listener at runtime.
   • DIt encrypts trace messages to protect sensitive data.
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2. 7application · medium

   A .NET Framework application uses a TraceSource named 'PaymentService' with a console listener and a file listener. The security team wants to record only events that contain the word 'Fraud' or have a source level of Error, while suppressing all other messages. You cannot modify the application code. What should you configure?

   • ASet the TraceSource.Switch.Level to Error and add a BooleanSwitch named 'Fraud' to the configuration.
   • BAdd a custom TraceFilter to both listeners that returns true only when the event type is Error or the message contains 'Fraud'.
   • CSet the TraceSource.Listeners collection to only include a custom listener that writes to a file when the message contains 'Fraud'.
   • DUse an EventTypeFilter with a ShouldTrace method that checks the message for 'Fraud'.
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4. 8application · medium

   A development team is building a .NET Framework library that will be used by multiple applications. They want to provide diagnostic output that can be enabled or disabled by the consuming application without requiring the library to reference a specific logging framework. What should they use?

   • AUse Debug.WriteLine and compile the library in Debug mode.
   • BWrite trace messages directly to the console using Console.WriteLine.
   • CUse TraceSource with a switch that the consuming application can configure in its own config file.
   • DUse a static ILogger instance from a third-party logging library.
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5. 9application · medium

   A .NET Framework application uses a TraceSwitch named 'AppSwitch' to control tracing. In production, the switch is set to Warning. During a support incident, an administrator needs to enable Verbose tracing temporarily without restarting the application. What should the administrator do?

   • AUse the DebugView tool to change the switch value at runtime.
   • BModify the registry key associated with the application to set the switch level.
   • CSet an environment variable named AppSwitch to Verbose and restart the application.
   • DEdit the application configuration file to change the AppSwitch value to Verbose, then restart the application.
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6. 10application · medium

   A .NET application uses a TraceSource named 'Authentication' and a TraceSource named 'DataAccess'. The team wants to log all messages from 'Authentication' but only Error-level messages from 'DataAccess'. They are using a shared TextWriterTraceListener for both sources. What is the most efficient way to achieve this?

   • ASet the DataAccess source's Switch to a TraceSwitch with Level=Error and leave the shared listener unfiltered.
   • BAttach two separate TextWriterTraceListeners, one for each source, and set an EventTypeFilter on the DataAccess listener to Error.
   • CSet the shared listener's Filter to an EventTypeFilter with EventType=Error.
   • DSet the shared listener's Filter to a SourceFilter that matches 'Authentication'.
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