Tracing in .NET CASENET Practice Questions (Page 5)

Questions 21–25

1. 21expert · hard

   A .NET Framework application uses a custom TraceListener that writes to a network share. The network share becomes unavailable, and the listener throws an exception. The application is configured with <trace autoflush="true"/>. What is the impact on the application?

   • AThe application stops tracing but continues normal execution because autoflush is true.
   • BThe application continues to run, but the trace output is buffered and written when the network share is available again.
   • CThe exception propagates to the trace source and can crash the application if not handled.
   • DThe exception is automatically swallowed by the trace infrastructure, and tracing continues silently.
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2. 22application · medium

   An ASP.NET application has application-level tracing enabled. Developers want to view trace details for a specific request that occurred 10 minutes ago. The application is hosted on a single server. What should they do?

   • AEnable page-level tracing on the page and reproduce the request.
   • BUse a network sniffer to capture the HTTP response and extract trace data.
   • CCheck the Windows Event Log for the trace details.
   • DNavigate to /trace.axd on the server and select the request from the list.
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4. 23expert · hard

   A .NET Framework application writes trace messages that include the user's email address and the full SQL query text. The compliance team requires that this sensitive data not appear in trace logs. The application uses a TraceSource with a custom listener that formats messages. What is the most effective way to prevent sensitive data from being logged?

   • AEncrypt the trace log file using NTFS encryption so that only authorized users can read it.
   • BAdd a TraceFilter to the custom listener that checks the message for '@' and 'SELECT' and suppresses those events.
   • CSet the TraceSource.Switch.Level to Error so that only error messages are logged, assuming errors do not contain sensitive data.
   • DModify the trace call sites to pass only non-sensitive parameters and ensure the custom listener's TraceEvent method does not include the original message format string.
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5. 24foundation · easy

   In .NET, what is the primary purpose of tracing compared to logging?

   • ATracing is a compile-time feature that removes all runtime diagnostics, while logging is a runtime feature.
   • BTracing is used exclusively for security auditing, while logging is used for performance monitoring.
   • CTracing captures detailed execution flow and diagnostic information during development and troubleshooting, while logging typically records significant events and errors for operational monitoring.
   • DTracing writes only to the Windows Event Log, while logging writes to text files.
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6. 25expert · hard

   A .NET application has multiple TraceSources, each with its own listeners. The team wants to ensure that a specific set of messages (e.g., all messages from the 'Security' source) are written to a separate file, while all other sources write to the default file. They also want to be able to change the set of sources that go to the separate file without recompiling. What is the best approach?

   • AAttach a separate TextWriterTraceListener to the 'Security' source and configure it in the application config file.
   • BSet the 'Security' source's switch to a higher level to reduce its output.
   • CUse a custom TraceListener that checks the source name and writes to the appropriate file.
   • DUse a TraceFilter on the default listener to exclude messages from the 'Security' source.
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