AZ-305 Question #45: Real Exam Question with Answer & Explanation

Question

Drag and Drop Question Your company designs an application based on the Azure microservices architecture that will: - Receive up to thousands of events per second from environmental sensors. - Submit events in real-time for formatting and pre-processing. - Ignore missed or improperly formatted data without interrupting the stream. - Write formatted event data to a Cosmos DB database. The number of events per second can vary widely. You need to determine which Azure services are necessary to support the solution. You want to keep costs to a minimum. Which Azure services should you include? To answer, drag the appropriate services to the correct answer areas. Each service may be used once, more than once, or not at all. Answer:

Explanation

Azure Event Hub is the correct choice for both ingesting the high-volume sensor events (receiving thousands of events per second) and for submitting events in real-time for formatting/pre-processing, as it is purpose-built for big data streaming and telemetry ingestion with high throughput and low latency. Azure Functions is the correct serverless compute option for formatting and pre-processing the event data because it scales automatically with variable event loads (minimizing costs by only charging for executions), can be triggered directly by Event Hub, and can gracefully handle/ignore malformed data without interrupting the stream before writing to Cosmos DB. This combination - Event Hub → Event Hub (stream processing trigger) → Azure Function → Cosmos DB - provides a cost-effective, scalable microservices pipeline.

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