AZ-204 Quality Control & Assurance 4

Question 1

A developer needs to test how an Azure Service Bus consumer handles poison messages. What is the best practice in a test environment?

Accepted Answer

Send malformed messages and assert the consumer moves them to the dead-letter sub-queue after max delivery attempts

Answer

Intentionally sending invalid messages and verifying they land in the dead-letter queue validates the poison-message handling path without impacting production queues.

Question 2

Which Azure Cosmos DB feature helps you validate that changes to your data model do not break existing queries before deploying to production?

Accepted Answer

Automatic indexing policy validation via the Azure portal query explorer

Answer

The Azure portal's Data Explorer lets you run queries against a copy of your container with a new indexing policy to verify correctness before applying changes.

Question 3

When writing integration tests for an Azure SQL Database, which approach best isolates each test from side effects of other tests?

Accepted Answer

Wrap each test in a transaction and roll it back in teardown

Answer

Wrapping each test in a transaction that is rolled back on teardown ensures the database returns to a clean state without permanently modifying data.

Question 4

You need to enforce that no NuGet package with a known critical vulnerability is used in your Azure DevOps build. Which component enables this?

Accepted Answer

A pipeline task running 'dotnet list package --vulnerable' and failing on critical findings

Answer

'dotnet list package --vulnerable' queries NuGet security advisories and the pipeline task can be scripted to exit with a non-zero code if critical vulnerabilities are found.

Question 5

In Azure Application Insights, what does 'Sampling' do and why is it relevant to QA?

Accepted Answer

Sampling reduces the volume of telemetry ingested by keeping a representative subset, which can mask infrequent errors in QA analysis

Answer

Adaptive or fixed-rate sampling discards a percentage of telemetry, so rare error events may not appear in reports, which is important to understand when analyzing QA results.

AZ-204 - Microsoft Azure Developer Associate Practice Test

AZ-204 - Microsoft Azure Developer Associate Practice Test

AZ-204 Quality Control & Assurance 4