704.4 Tracing (weight: 2) DEVOPS-TOOLS-ENGINEER Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   In the context of observability, which statement best describes the role of distributed tracing?

   • AIt provides a high-level overview of system health through aggregated metrics and alerts
   • BIt helps identify which specific service or operation causes a request to be slow or fail
   • CIt ensures that all services are deployed with the same configuration and version
   • DIt replaces the need for logging by capturing all application output in a structured format
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2. 17application · medium

   A company has a complex microservices architecture. They are seeing an increase in customer complaints about slow responses. They have metrics showing overall service latency is increasing, but they cannot determine which specific service or dependency is causing the slowdown. What is the most effective way to identify the bottleneck?

   • ALook at the average latency of each service in the metrics dashboard.
   • BCheck the network latency between services using ping.
   • CUse distributed tracing to analyze traces of slow requests and identify the span with the highest duration.
   • DIncrease the log level to DEBUG for all services to capture more details.
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4. 18expert · hard

   A team is analyzing a trace for a user request that is failing. The trace shows the following spans: `frontend` (500ms), `auth` (50ms), `database` (450ms). The `database` span has an error status. The team also sees a log entry from the database service with the same trace ID that says 'connection pool exhausted'. Which conclusion is most strongly supported by the trace and log data?

   • AThe database is slow but not failing, and the error is a false positive.
   • BThe frontend service has a bug that is causing the database to fail.
   • CThe frontend service is slow because it is waiting for the database, which is failing due to a connection pool issue.
   • DThe auth service is the root cause because it is the first service in the trace.
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5. 19foundation · easy

   In distributed tracing, what is a 'span'?

   • AThe entire journey of a request from entry point to final response
   • BA unique identifier assigned to each service instance in the cluster
   • CA collection of logs generated by a single service during a request
   • DA single logical operation within a service, such as a database query or an HTTP call
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6. 20expert · hard

   A platform team runs a high-traffic microservices environment. They want to trace all requests to a critical payment endpoint to debug a rare, intermittent error that only occurs under specific conditions. They also want to keep storage costs low. They are currently using head-based sampling at 10%. What should they do to increase the chance of capturing the rare error without exploding storage costs?

   • AUse a fixed-rate sampler at 50% for all services and rely on log correlation to find the error.
   • BSwitch to tail-based sampling with a policy that keeps all traces with an error status and samples a percentage of successful traces.
   • CDisable sampling entirely for the payment endpoint and store all traces indefinitely.
   • DIncrease head-based sampling to 100% for the payment endpoint and keep 10% for all other endpoints.
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