Microservices Interservice Communication Strategies 2

Question 1

Which communication style introduces the tightest temporal coupling between two microservices?

Accepted Answer

Synchronous request/response

Answer

Synchronous request/response requires both services to be available at the same time, creating temporal coupling.

Question 2

What is the primary benefit of using a message broker like RabbitMQ between services?

Accepted Answer

It decouples producers and consumers in time and space

Answer

A broker buffers messages so producers and consumers do not need to interact directly or simultaneously.

Question 3

In a request/response REST call, which HTTP status code best signals that the caller should retry later?

Accepted Answer

503 Service Unavailable

Answer

503 indicates a transient unavailability, making it a retryable condition.

Question 4

Which pattern lets a client make a single call that a gateway fans out to multiple backend services?

Accepted Answer

API composition / aggregation

Answer

API composition aggregates results from several services behind one client-facing endpoint.

Question 5

What does gRPC use as its default serialization format?

Accepted Answer

Protocol Buffers

Answer

gRPC uses Protocol Buffers, a compact binary format, by default.

Microservices Practice Test