ExpertHard1 markMultiple Choice
AZ-305 · Question 43 · Domain 4.2: Application Architecture
You are designing a microservices architecture. Service A generates orders. Service B processes payments. Service C updates inventory. When an order is generated, both Service B and Service C must receive the order data. If Service B is temporarily offline, the order must be retained until Service B comes back online. Which TWO messaging services could you use to decouple these microservices? (Select TWO)
You are designing a microservices architecture. Service A generates orders. Service B processes payments. Service C updates inventory. When an order is generated, both Service B and Service C must receive the order data. If Service B is temporarily offline, the order must be retained until Service B comes back online. Which TWO messaging services could you use to decouple these microservices? (Select TWO)
Answer options:
A.
Azure Event Grid.
B.
Azure Service Bus Topics.
C.
Azure Service Bus Queues.
D.
Azure Event Hubs.
E.
Azure Queue Storage.
How to approach this question
Identify messaging services that support 1-to-many publish/subscribe patterns with message retention.
Full Answer
To send one message to multiple receivers (publish/subscribe), you need Service Bus Topics or Event Hubs. Service Bus Queues and Storage Queues are point-to-point (competing consumers), meaning only one service would get the message.
Common mistakes
Selecting Service Bus Queues, forgetting that queues are 1:1, not 1:many.
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