Back-End Development An Intro to Full-Stack Development 4

Question 1

What is the purpose of a package manager like npm or Yarn in full-stack JavaScript development?

Accepted Answer

To manage, install, and version third-party libraries

Answer

Package managers handle dependency installation, versioning, and script execution for JavaScript projects.

Question 2

Which caching strategy involves storing database query results in memory to reduce repeated database hits?

Accepted Answer

In-memory caching (e.g., Redis)

Answer

In-memory stores like Redis cache frequently accessed data, dramatically reducing database load.

Question 3

What does the term 'API endpoint' refer to in back-end development?

Accepted Answer

A specific URL that accepts requests and returns data

Answer

An endpoint is a specific URL route on a server that clients call to perform an action or retrieve data.

Question 4

In a full-stack application, what is the typical flow of a user login request?

Accepted Answer

Browser → API → Database → API → Browser

Answer

The browser sends credentials to the API, the API checks the database, and returns a success or failure response to the browser.

Question 5

Which HTTP status code range indicates a server-side error?

Accepted Answer

5xx

Answer

5xx codes (like 500 Internal Server Error) signal that the server failed to fulfill a valid request.

Back-End Development Practice Test