Back-End Development Microservices and Cloud Back-End Architecture 3

Question 1

What is a CDN (Content Delivery Network) and how does it benefit back-end performance?

Accepted Answer

A geographically distributed network of servers that caches and serves content from locations closer to users

Answer

A database replication system for cloud environments

Answer

A cloud monitoring platform for tracking API performance

Answer

A network security tool for filtering malicious traffic

Question 2

What is a health check endpoint in a back-end service?

Accepted Answer

A dedicated API endpoint that reports the service's operational status for load balancers and orchestration systems

Answer

An endpoint that checks the health of the requesting user's session

Answer

An endpoint that monitors database query performance

Answer

A security endpoint that scans for vulnerabilities

Question 3

What is blue-green deployment?

Accepted Answer

A release strategy maintaining two identical production environments where traffic is switched from the current (blue) to the new (green) version

Answer

Deploying blue (test) features for green (paying) users

Answer

A color-coded system for marking microservices by team

Answer

A canary release strategy for gradual rollout

Question 4

What is gRPC and how does it differ from REST?

Accepted Answer

gRPC uses Protocol Buffers over HTTP/2 for high-performance binary communication; REST typically uses JSON over HTTP/1.1

Answer

gRPC is a JavaScript framework; REST is a language-agnostic protocol

Answer

gRPC is for browser clients; REST is for server-to-server communication

Answer

They are identical protocols with different branding

Question 5

What is observability in distributed back-end systems?

Accepted Answer

The ability to understand a system's internal state from its external outputs through logs, metrics, and traces

Answer

The ability to watch live traffic in a browser dashboard

Answer

A cloud compliance requirement for monitoring user activity

Answer

The practice of code reviewing distributed service implementations

Question 6

What is event-driven architecture?

Accepted Answer

A design where services communicate by producing and consuming events, enabling loose coupling and asynchronous processing

Answer

An architecture based on scheduling tasks at fixed time intervals

Answer

An architecture optimized for real-time gaming applications

Answer

A UI pattern for handling user interaction events