Microservices API Gateway and Management Questions and Answers

Question 1

An e-commerce company wants to implement a canary release for its new 'ProductSearch' microservice.
The goal is to direct 5% of live traffic to the new version (v2) while the remaining 95% continues to use the stable version (v1).
Which API Gateway capability is essential for achieving this traffic-splitting strategy?

Accepted Answer

Dynamic Routing

Answer

Request Aggregation

Answer

Protocol Translation

Answer

Response Caching

Question 2

In a microservices architecture, which security function is most effectively centralized at the API Gateway to avoid redundant and potentially inconsistent implementations across individual services?

Accepted Answer

Authentication and client token validation (e.g., JWT verification)

Answer

Fine-grained, role-based access control within a service's domain

Answer

Business logic input validation (e.g., ensuring an order quantity is positive)

Answer

Encryption of data at rest within a service's database

Question 3

A mobile application's main screen needs to display a user's profile, their last three transactions, and their loyalty status. This data resides in three separate microservices: 'User', 'Transaction', and 'Loyalty'. To minimize the number of network requests from the client device, which pattern should be implemented at the API Gateway?

Accepted Answer

API Composition (Aggregation)

Answer

Gateway Offloading

Answer

Circuit Breaking

Answer

Rate Limiting

Question 4

Which of the following describes the primary role of an API Gateway in a microservices architecture?

Accepted Answer

To act as a single entry point for clients, handling routing, security, and other cross-cutting concerns.

Answer

To manage the deployment and scaling of individual microservice instances.

Answer

To orchestrate complex, multi-service business transactions using the Saga pattern.

Answer

To provide a persistent storage layer shared by all microservices.

Question 5

A company exposes its APIs to third-party developers. To ensure fair usage and protect backend services from being overwhelmed by any single developer's application, which API Gateway policy is most appropriate to implement?

Accepted Answer

Throttling (Rate Limiting)

Answer

Request Transformation

Answer

Caching

Answer

Protocol Translation

Question 6

When an API Gateway handles tasks like SSL/TLS termination for all incoming traffic, it is performing a function known as:

Accepted Answer

Gateway Offloading

Answer

Request Aggregation

Answer

Gateway Routing

Answer

Backend for Frontend (BFF)