AZ-204 Case Studies & Practical Application 2

Question 1

A startup's Azure Function processes uploaded images by resizing them and storing results in Blob Storage. During peak hours, the function times out after 5 minutes before completing. What is the BEST solution?

Accepted Answer

Switch to Durable Functions with a fan-out/fan-in pattern to parallelize image processing

Answer

Durable Functions with fan-out/fan-in allows parallel processing of multiple images, reducing total execution time rather than just extending the timeout.

Question 2

A company stores customer records in Azure Cosmos DB with a partition key of /country. Analytics queries frequently filter by /productCategory across all countries. Performance is poor. What should the developer recommend?

Accepted Answer

Create a new container with /productCategory as the partition key for analytics

Answer

Cross-partition queries are expensive; creating a dedicated container with /productCategory as the partition key allows efficient fan-in queries for analytics workloads.

Question 3

A developer needs to deploy a containerized web app that automatically scales to zero when idle to minimize costs, but must start within 30 seconds on first request. Which Azure service fits best?

Accepted Answer

Azure Container Apps with scale-to-zero enabled

Answer

Azure Container Apps supports scale-to-zero natively and is designed for containerized microservices with fast cold starts, unlike ACI which lacks automatic HTTP-triggered scaling.

Question 4

An e-commerce app uses Azure Service Bus to process orders. Occasionally, a malformed order message causes the consumer to throw an exception repeatedly. After how many delivery attempts does Service Bus move the message to the Dead Letter Queue by default?

Accepted Answer

10

Answer

Azure Service Bus moves a message to the Dead Letter Queue after 10 failed delivery attempts by default (MaxDeliveryCount = 10).

Question 5

A developer must cache API responses in Azure API Management for GET requests but only when the response status is 200. Which APIM policy should be used?

Accepted Answer

cache-store with a condition checking context.Response.StatusCode

Answer

The cache-store policy supports a condition attribute, allowing you to cache only successful 200 responses by checking context.Response.StatusCode.

AZ-204 - Microsoft Azure Developer Associate Practice Test

AZ-204 - Microsoft Azure Developer Associate Practice Test

AZ-204 Case Studies & Practical Application 2