Full-Stack Development Developer 4

Question 1

What is the purpose of a reverse proxy (like Nginx) in front of a Node.js application?

Accepted Answer

To handle SSL termination, load balancing, and static file serving

Answer

A reverse proxy sits in front of the application server to offload SSL, cache static assets, and distribute traffic across instances.

Question 2

In a REST API, what does idempotency mean, and which HTTP methods are idempotent?

Accepted Answer

Making the same request multiple times produces the same result; GET, PUT, and DELETE

Answer

Idempotent methods produce the same server state regardless of how many times they are called; GET, PUT, and DELETE all qualify.

Question 3

What is the event loop in Node.js and why does blocking it cause problems?

Accepted Answer

A single-threaded mechanism that processes I/O callbacks; blocking it halts all request handling

Answer

Node.js uses a single event loop thread; synchronous CPU-bound code blocks it and prevents any other requests from being processed.

Question 4

Which pattern does Redux follow, and what are its three core principles?

Accepted Answer

Flux pattern; unidirectional data flow, single store, and pure reducers

Answer

Redux implements Flux with a single immutable state tree, actions describing changes, and pure reducer functions that produce the next state.

Question 5

What problem does Docker solve for full-stack developers?

Accepted Answer

It packages an application with its environment so it runs consistently across machines

Answer

Docker containers bundle the application code, runtime, libraries, and config, eliminating 'works on my machine' environment inconsistencies.

Full-Stack Development Practice Test