Microservices Interservice Communication Strategies 2

Question 1

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

Accepted Answer

Synchronous request/response

Answer

Asynchronous messaging via a broker

Answer

Event streaming with replay

Answer

Fire-and-forget pub/sub

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

It guarantees zero network latency

Answer

It removes the need for serialization

Answer

It eliminates the need for service discovery

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

400 Bad Request

Answer

404 Not Found

Answer

401 Unauthorized

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

Database-per-service

Answer

Strangler fig

Answer

Bulkhead isolation

Question 5

What does gRPC use as its default serialization format?

Accepted Answer

Protocol Buffers

Answer

JSON

Answer

XML

Answer

YAML

Question 6

Which approach avoids blocking the caller's thread while waiting for a downstream response?

Accepted Answer

Asynchronous (non-blocking) communication

Answer

Synchronous polling in a loop

Answer

Sequential blocking calls

Answer

Two-phase commit

Question 7

Why is point-to-point synchronous chaining of many services often discouraged?

Accepted Answer

Latency and failure probability compound across the chain

Answer

It reduces total network calls

Answer

It guarantees stronger consistency

Answer

It removes the need for timeouts