AZ-400 Implement an instrumentation strategy Practice Question
This AZ-400 practice question tests your understanding of implement an instrumentation strategy. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A development team is implementing a distributed tracing solution for a microservices application deployed on Azure. They want to correlate requests across services using OpenTelemetry and send data to Azure Monitor. The application currently generates traces, but the traces are incomplete, showing only individual service spans without end-to-end correlation. The team has already instrumented each service with the OpenTelemetry SDK. What should the team do to ensure proper end-to-end trace correlation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement context propagation by passing trace headers between services.
Option A is correct because distributed tracing requires propagating trace context (trace ID, span ID) across service boundaries via HTTP headers (e.g., W3C Trace-Context). Without context propagation, each service creates its own trace, resulting in disconnected spans. The OpenTelemetry SDK automatically handles propagation when configured, but the team must ensure that outgoing requests include the trace headers and incoming requests extract them.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Implement context propagation by passing trace headers between services.
Why this is correct
Context propagation is required to correlate spans across services.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable the Application Insights auto-instrumentation agent on the application host.
Why it's wrong here
Auto-instrumentation is for metrics, not trace context propagation.
✗
Configure the OpenTelemetry SDK to use the Azure Monitor exporter instead of the default exporter.
Why it's wrong here
Exporter choice does not affect context propagation.
✗
Set the same service name for all services in the OpenTelemetry configuration.
Why it's wrong here
Service name is for identification, not trace correlation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse telemetry export (sending data to a backend) with context propagation (passing trace IDs between services), assuming that using the correct exporter or agent automatically correlates spans.
Detailed technical explanation
How to think about this question
OpenTelemetry relies on the W3C Trace-Context standard (traceparent and tracestate headers) to propagate trace context. The SDK's propagator must be explicitly configured (e.g., using W3CTraceContextPropagator) and integrated into the HTTP client/server libraries (e.g., via instrumentation libraries like @opentelemetry/instrumentation-http). Without this, each service generates a new root trace ID, making end-to-end correlation impossible even if all spans are exported to the same Azure Monitor workspace.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-400 question in full detail.
Implement an instrumentation strategy — This question tests Implement an instrumentation strategy — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Implement context propagation by passing trace headers between services. — Option A is correct because distributed tracing requires propagating trace context (trace ID, span ID) across service boundaries via HTTP headers (e.g., W3C Trace-Context). Without context propagation, each service creates its own trace, resulting in disconnected spans. The OpenTelemetry SDK automatically handles propagation when configured, but the team must ensure that outgoing requests include the trace headers and incoming requests extract them.
What should I do if I get this AZ-400 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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