Tracing in .NET CASENET Practice Questions (Page 9)

Questions 41–45

1. 41foundation · easy

   Which method must a custom trace filter implement?

   • ATraceEvent
   • BFilter
   • CShouldTrace
   • DWrite
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2. 42application · medium

   A .NET Framework application writes trace messages to a rolling file using a TextWriterTraceListener. In production, the file grows too quickly because verbose messages are always recorded. The team wants to keep the existing file listener but reduce disk usage without recompiling the application. What should you do?

   • AAdd a BooleanSwitch named 'Verbose' and set it to false to disable all trace output.
   • BReplace the TextWriterTraceListener with an EventLogTraceListener and set the source's Switch.Level to Error.
   • CAdd a TraceSwitch to the configuration file and set its Level to Warning, then guard trace calls with an if (traceSwitch.TraceWarning) check.
   • DSet the Trace.AutoFlush property to false in the configuration file to reduce disk writes.
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4. 43foundation · easy

   What is the role of a trace filter in .NET tracing?

   • AIt formats trace messages into a specific output format.
   • BIt determines whether a trace message should be processed by a listener based on criteria such as source, level, or custom logic.
   • CIt controls the verbosity level of a TraceSource.
   • DIt redirects trace output to a different listener.
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5. 44expert · hard

   A .NET Core microservice emits telemetry using DiagnosticSource and Activity. The operations team wants to correlate traces across multiple services and also wants to avoid the overhead of capturing stack traces for every event. The service already uses an ActivityListener. What should you implement?

   • ASet Activity.DefaultIdFormat to W3C and propagate the Activity.Id in an HTTP header (e.g., traceparent) to downstream services.
   • BDisable DiagnosticSource events that have a high frequency and rely only on Activity.Start/Stop events.
   • CAdd a TraceSwitch to the service and set it to Verbose to ensure all activity events are recorded.
   • DUse Activity.Current to capture the current activity and write its Id to a custom log file on every DiagnosticSource event.
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6. 45foundation · easy

   In classic ASP.NET, which configuration element enables application-level tracing?

   • A<trace>
   • B<customErrors>
   • C<compilation>
   • D<httpRuntime>
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