Tracing in .NET CASENET Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A .NET Core microservices application processes orders across three services. Support engineers need to correlate all trace messages for a single order request across the services. The application already uses DiagnosticSource for telemetry. What should be implemented to achieve correlation?

   • AGenerate a new Activity per service and set the TraceId to the incoming request's TraceId.
   • BLog the machine name and process ID in every trace message to correlate across services.
   • CEnable application-level tracing in each service's web.config and rely on the ASP.NET trace output.
   • DUse the Activity class to start an activity at the entry point and propagate its Id via the HTTP header 'Request-Id' to downstream services.
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2. 2expert · hard

   A .NET Framework application uses a custom TraceListener that writes to a database. The listener is slow and occasionally throws exceptions, which causes the application to crash. The team wants to ensure that tracing failures do not affect the application's core functionality. What should you do?

   • ASet the TraceSource.Switch.Level to Off to disable tracing when the listener is slow.
   • BRemove the custom listener and use only a TextWriterTraceListener to avoid exceptions.
   • CSet the Trace.AutoFlush property to false to reduce the frequency of listener calls.
   • DWrap the listener's TraceEvent method in a try-catch block that swallows exceptions and writes a fallback message to the event log.
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4. 3foundation · easy

   What is the purpose of a custom trace listener in .NET?

   • ATo filter trace messages based on custom criteria before they are written.
   • BTo write trace output to a destination not supported by built-in listeners, such as a database or a custom monitoring system.
   • CTo change the format of trace messages to a standard JSON structure.
   • DTo control the verbosity of trace output based on a custom level.
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5. 4expert · hard

   A .NET Core application uses ActivitySource to create activities for database operations. The team wants to export these activities to an OpenTelemetry collector. They also want to ensure that sensitive SQL query text is not included in the activity tags. What should they do?

   • AUse a custom ActivityListener that filters out activities containing SQL queries.
   • BNever add the SQL query to the activity tags and only log it locally.
   • CAdd the SQL query to the activity as a tag only when a configuration flag is enabled, and use a processor to redact sensitive tags before export.
   • DAlways add the SQL query as a tag and rely on the collector to redact it.
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6. 5foundation · easy

   In .NET, what is the role of a TraceSource object?

   • AIt is a method that writes trace messages to the debug output window.
   • BIt defines the destination for trace output, such as a file or event log.
   • CIt represents a named source of trace messages that can be configured with listeners and switches.
   • DIt is a configuration file that controls all tracing in an application.
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