AZ-400 Implement an instrumentation strategy Practice Question
This AZ-400 practice question tests your understanding of implement an instrumentation strategy. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
You are configuring Application Insights for a .NET Core web application deployed to Azure App Service. The application must capture telemetry for all HTTP requests, exceptions, and dependency calls with minimal code changes. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable the Application Insights site extension in the App Service 'Application Insights' blade.
Option A is correct because enabling the Application Insights site extension via the App Service 'Application Insights' blade automatically instruments the .NET Core application without requiring any code changes. This extension injects the necessary telemetry modules to capture HTTP requests, exceptions, and dependency calls at the runtime level, leveraging the Azure App Service integration for zero-code instrumentation.
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.
✓
Enable the Application Insights site extension in the App Service 'Application Insights' blade.
Why this is correct
The site extension enables auto-instrumentation with no code changes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure diagnostics logging in the App Service and stream logs to Application Insights.
Why it's wrong here
Diagnostics logging captures only logs, not full telemetry.
✗
Install the Microsoft.ApplicationInsights.AspNetCore NuGet package and add services.AddApplicationInsightsTelemetry() in Startup.cs.
Why it's wrong here
This requires code changes, which the scenario wants to minimize.
✗
Add the Application Insights JavaScript SDK to each page.
Why it's wrong here
This only captures client-side telemetry, not server-side.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the NuGet package (Option C) is always required for .NET Core instrumentation, overlooking the zero-code site extension option that meets the 'minimal code changes' requirement more directly.
Trap categories for this question
Scenario analysis trap
This requires code changes, which the scenario wants to minimize.
Detailed technical explanation
How to think about this question
The Application Insights site extension works by attaching a native module (ApplicationInsightsAgent) to the .NET Core runtime via the App Service's sandbox, which intercepts HTTP requests, dependency calls (e.g., SQL, HTTP outbound), and unhandled exceptions using EventSource and DiagnosticSource listeners. In a real-world scenario, this is ideal for legacy or third-party applications where modifying source code is impractical, but it may miss custom telemetry (e.g., business events) that the code-based SDK can capture via TelemetryClient.
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: Enable the Application Insights site extension in the App Service 'Application Insights' blade. — Option A is correct because enabling the Application Insights site extension via the App Service 'Application Insights' blade automatically instruments the .NET Core application without requiring any code changes. This extension injects the necessary telemetry modules to capture HTTP requests, exceptions, and dependency calls at the runtime level, leveraging the Azure App Service integration for zero-code instrumentation.
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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