Tracing in .NET CASENET Practice Questions (Page 7)

Questions 31–35

1. 31foundation · easy

   What is the purpose of a correlation ID in distributed tracing?

   • ATo encrypt trace messages so that only authorized services can read them.
   • BTo determine the verbosity level of trace output in each service.
   • CTo identify the physical server that processed a request.
   • DTo uniquely identify a single request as it flows through multiple components and services, enabling end-to-end tracing.
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2. 32application · medium

   A development team is building a .NET library that will be used by multiple applications. They need to provide diagnostic information to developers who consume the library, but they do not want to force a specific logging framework on consumers. They also want to minimize performance overhead when tracing is disabled. What should they do?

   • AUse a third-party logging framework like NLog or Serilog and require consumers to configure it.
   • BWrite trace messages directly to the console using Console.WriteLine.
   • CUse Debug.WriteLine statements throughout the library code.
   • DExpose a TraceSource in the library and let consumers attach their own listeners.
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4. 33application · medium

   A .NET Framework application has a TraceSource named 'OrderProcessor'. The team wants to send trace events to both the Windows Event Log and a text file, but only events of level Warning and above should go to the event log, while all events should go to the file. What should you configure?

   • AAdd both listeners and set the TraceSource's TraceFilter to a custom filter that allows Warning+ events.
   • BSet the TraceSource.Switch.Level to Warning and add both listeners to the source.
   • CCreate two separate TraceSource objects, one for the event log and one for the file, each with its own switch level.
   • DAdd two listeners to the TraceSource: an EventLogTraceListener with an EventTypeFilter set to Warning, and a TextWriterTraceListener with no filter.
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5. 34application · medium

   A .NET Core application uses Activity to trace an HTTP request. The application calls an external REST API and wants to include the activity ID in the outgoing request so the external service can correlate its logs. What should you do?

   • AUse Activity.Current.Stop() before making the external call to ensure the ID is finalized.
   • BWrite the Activity.Id to the application's log file and ask the external service to search for it.
   • CSet Activity.DefaultIdFormat to Hierarchical and include the ID in the query string.
   • DRead Activity.Current.Id and add it to the HTTP request headers as the 'traceparent' header.
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6. 35application · medium

   A .NET Framework web application processes orders through a front-end web service and a separate order-processing Windows service. Support engineers need to correlate a single user's request across both components in the trace logs. The team already uses TraceSource in both components. What should you configure to meet this requirement?

   • ASet the TraceSwitch.Level property to Verbose in both components so all trace messages are recorded.
   • BConfigure a shared TraceListener in the application configuration file of both components that writes to the same file.
   • CSet the Trace.CorrelationManager.ActivityId property to a new GUID at the start of each request in the web service and propagate it to the Windows service via a message header.
   • DUse a custom TraceFilter that checks the Thread.CurrentPrincipal.Identity.Name to include only events from the same user.
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