Microservices Core Architectural Principles 4

Question 1

What consistency model is typically embraced across microservice boundaries?

Accepted Answer

Eventual consistency

Answer

Because each service owns its data, eventual consistency is commonly accepted across boundaries.

Question 2

Which pattern manages a business transaction spanning multiple services without distributed locks?

Accepted Answer

Saga pattern

Answer

The Saga pattern coordinates a sequence of local transactions with compensating actions instead of distributed locks.

Question 3

What role does an API gateway play in a microservices architecture?

Accepted Answer

It provides a single entry point handling routing, auth, and aggregation

Answer

An API gateway is a single entry point that handles cross-cutting concerns like routing, authentication, and aggregation.

Question 4

Why is service discovery important in microservices?

Accepted Answer

Instances are dynamic, so services must locate each other at runtime

Answer

Service instances scale and move dynamically, so discovery lets services find each other at runtime.

Question 5

What does idempotency guarantee in service-to-service messaging?

Accepted Answer

Processing the same message multiple times has the same effect as once

Answer

Idempotency ensures repeated delivery of the same message produces the same result, vital for at-least-once messaging.

Microservices Practice Test