200-901 Software Development and Design Practice Question
In a microservices architecture, which communication pattern is typically asynchronous and decoupled?
⚠ Common exam trap
Cisco often tests the misconception that any HTTP-based communication (like REST) is inherently asynchronous, but REST over HTTP is synchronous by default unless combined with additional patterns like webhooks or message queues.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Event-driven architecture
Event-driven architecture (D) is the correct answer because it is inherently asynchronous and decoupled: services communicate by publishing events to a message broker (e.g., Kafka, RabbitMQ) without needing to know about the consumers. This pattern allows the producer to emit an event and continue processing immediately, while consumers react to events at their own pace, achieving loose coupling and high scalability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
REST over HTTP
Why it's wrong here
Typically synchronous.
- ✗
SOAP
Why it's wrong here
Synchronous.
- ✗
gRPC
Why it's wrong here
Usually synchronous.
- ✓
Event-driven architecture
Why this is correct
Asynchronous and decoupled.
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