Microsoft Azure Solutions Architect Expert AZ-305 Practice Question

Azure Event Grid domains provide a fully managed, serverless publish/subscribe service that automatically scales to millions of events per second, supports event sizes up to 1 MB, and delivers events to multiple subscribers with at-least-once guarantees. Domains add tenant-level routing, making them ideal for multi-tenant SaaS scenarios. Event Grid integrates natively with Azure Functions using Event Grid triggers, allowing near real-time processing with minimal code.

Azure Service Bus topics deliver rich enterprise messaging features such as sessions and ordered delivery, but they require capacity planning and do not scale automatically to very high throughput. Azure Event Hubs is optimized for streaming telemetry; it uses a pull model, does not push events to multiple services, and needs consumer group management. Azure Storage Queues lack publish/subscribe fan-out and advanced routing. Therefore, Event Grid domains best meet the stated requirements.