Event Grid vs Service Bus decision in Azure - Practice Questions

Challenge - 5 Problems

🧠 Conceptual

intermediate

When to choose Event Grid over Service Bus?

You want to build a system that reacts instantly to changes in storage blobs and routes these events to multiple independent services. Which service is best suited for this scenario?

A Use Service Bus because it supports complex message workflows and sessions.

B Use Event Grid because it is designed for event routing and supports multiple subscribers.

C Use Event Grid because it stores messages for long periods for batch processing.

D Use Service Bus because it guarantees ordered message delivery.

💡 Hint

Think about which service is optimized for event distribution to many listeners.

Event Grid is designed for reactive event routing to multiple subscribers with low latency. Service Bus is better for complex messaging patterns and guaranteed delivery.

❓ Architecture

intermediate

Designing a decoupled system with guaranteed message processing

You need to build a system where messages must be processed exactly once and in order, even if the consumer is temporarily offline. Which Azure service should you use?

A Event Grid, because it supports event replay and dead-lettering.

B Event Grid with multiple event subscriptions for redundancy.

C Service Bus without sessions because it is simpler to configure.

D Service Bus with sessions enabled to guarantee ordered, exactly-once processing.

💡 Hint

Consider which service supports message ordering and exactly-once delivery.

Service Bus with sessions supports ordered and exactly-once message processing, even if consumers are offline. Event Grid does not guarantee ordering or exactly-once delivery.

❓ service_behavior

advanced

Event Grid event delivery behavior under high load

What happens when Event Grid receives more events than it can deliver to subscribers within the retry period?

A Event Grid retries delivery for up to 24 hours and then sends undeliverable events to a dead-letter destination if configured.

B Event Grid drops the events silently without notification.

C Event Grid queues the events indefinitely until subscribers are available.

D Event Grid automatically scales subscribers to handle the load.

💡 Hint

Think about how Event Grid handles retries and failures.

Event Grid retries event delivery for up to 24 hours. If delivery still fails, events are sent to a dead-letter destination if configured, otherwise they are dropped.

❓ security

advanced

Securing message access in Service Bus vs Event Grid

You want to restrict who can send messages to your messaging system and who can receive them. Which statement is true about access control in Service Bus and Event Grid?

A Service Bus supports role-based access control (RBAC) for send and receive permissions; Event Grid only supports RBAC for event publishing.

B Event Grid supports fine-grained access control for both publishing and subscribing; Service Bus does not support RBAC.

C Both Service Bus and Event Grid only support shared access keys without RBAC.

D Service Bus does not support authentication; Event Grid uses OAuth tokens for all access.

💡 Hint

Consider which service supports RBAC for both sending and receiving messages.

Service Bus supports RBAC for controlling send and receive permissions. Event Grid supports RBAC mainly for event publishing, while subscriptions are controlled differently.

✅ Best Practice

expert

Choosing between Event Grid and Service Bus for a large-scale microservices system

You are designing a large microservices system that requires event-driven communication with low latency, high throughput, and the ability to handle millions of events per day. The system also needs to support complex workflows with message sessions and dead-lettering. Which approach is best?

A Use Service Bus exclusively because it supports message sessions and dead-lettering but may have higher latency.

B Use Event Grid exclusively because it handles millions of events with low latency and supports complex workflows.

C Use Event Grid for event routing and Service Bus for complex workflows requiring sessions and guaranteed delivery.

D Use neither; build a custom messaging system to meet all requirements.

💡 Hint

Think about combining services to leverage their strengths.

Event Grid is ideal for high-throughput, low-latency event routing. Service Bus is better for complex workflows needing sessions and guaranteed delivery. Combining both leverages their strengths.