AZ-204 Case Studies & Practical Application 4

Question 1

A developer needs to push IoT device data to 500 downstream consumers in real time with minimal latency. Individual consumers need to replay events from the last 7 days. Which Azure service is the best fit?

Accepted Answer

Azure Event Hubs with a 7-day retention period

Answer

Event Hubs is designed for high-throughput event streaming with configurable retention and consumer group replay, supporting thousands of concurrent consumers.

Question 2

A company's App Service web app must access an internal SQL Server hosted on-premises without exposing it to the public internet. What is the recommended connectivity option?

Accepted Answer

Configure Hybrid Connections on the App Service to reach the on-premises SQL Server

Answer

Hybrid Connections use an outbound TCP relay via Service Bus, requiring no inbound firewall rules and no VNet, making it the simplest option for App Service to on-premises connectivity.

Question 3

A developer needs to implement optimistic concurrency for updates to an Azure Cosmos DB document. Which approach should be used?

Accepted Answer

Use the _etag property and pass it as an AccessCondition with IfMatch on each update request

Answer

Cosmos DB's _etag enables optimistic concurrency; the IfMatch header causes the operation to fail with a 412 if another process has modified the document since it was read.

Question 4

A containerized API on Azure Container Apps is returning 503 errors under load. The developer checks metrics and sees the replica count has reached the maximum of 10 but CPU is at 95%. What should be changed first?

Accepted Answer

Increase the maximum replica count and review CPU-based scaling rules

Answer

When replicas are at max and CPU is saturated, increasing the replica ceiling and verifying scaling triggers are correctly configured is the immediate action to restore capacity.

Question 5

A developer implements retry logic for an Azure Blob Storage SDK call using an exponential backoff strategy. Calls are failing with HTTP 409 (Conflict) errors. Should 409 be retried?

Accepted Answer

No; 409 indicates a conflict condition that won't resolve by retrying—handle it explicitly in application logic

Answer

HTTP 409 Conflict in Blob Storage (e.g., lease conflict or blob already exists) is a business-logic error that retrying will not resolve—it requires explicit handling.

AZ-204 - Microsoft Azure Developer Associate Practice Test

AZ-204 - Microsoft Azure Developer Associate Practice Test

AZ-204 Case Studies & Practical Application 4