704.4 Tracing (weight: 2) DEVOPS-TOOLS-ENGINEER Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A team is evaluating tracing tools. They need a tool that supports multiple storage backends, has a simple UI for searching traces by service and duration, and is a well-established open-source project. They are already using OpenTelemetry for instrumentation. Which tool should they choose?

   • AJaeger
   • BZipkin
   • COpenTelemetry Collector
   • DGrafana Tempo
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   When analyzing a trace, what does a span with a long duration and a child span with a similar long duration typically indicate?

   • AThe network between services is the bottleneck
   • BThe bottleneck is likely in the child operation, not the parent
   • CThe parent operation is slow due to CPU contention on the host
   • DThe trace is malformed and should be discarded
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A trace shows a request that took 2 seconds. The spans are: `frontend` (200ms), `auth` (100ms), `inventory` (1700ms). The `inventory` span has an error. The team also sees a log from the inventory service with the same trace ID that says 'timeout waiting for database connection'. What is the most likely root cause?

   • AThe auth service is the root cause because it is in the middle of the trace.
   • BThe inventory service is failing due to a database connection timeout.
   • CThe frontend service is slow because it is waiting for the inventory service.
   • DThe database is the root cause because it is not responding.
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   What is the benefit of correlating traces with metrics in observability?

   • AMetrics replace the need for traces by providing the same information
   • BTraces can be used to generate metrics, so correlation is unnecessary
   • CCorrelation allows metrics to be stored in the trace database
   • DMetrics provide high-level trends, and traces provide detailed request-level context to investigate anomalies
   Reveal Solution Discussion Select an answer first
6. 25foundation · easy

   Which of the following is a common approach to instrumenting an application for tracing?

   • AConfiguring the operating system to capture network packets for each service
   • BWriting a custom kernel module to intercept system calls
   • CUsing an agent that automatically instruments supported frameworks without code changes
   • DManually adding trace context to every log message in the application
   Reveal Solution Discussion Select an answer first