What is the primary purpose of Node.js's non-blocking I/O model?

To block the event loop until all I/O operations are complete.

To allow a single thread to handle many concurrent operations without waiting for each to finish.

To use multiple threads to execute JavaScript code in parallel.

To ensure that all operations complete in the order they were initiated.

A developer is explaining Node.js to a colleague and says it is 'event-driven and non-blocking'. What does this mean in practice?

The event loop can handle multiple I/O operations concurrently without waiting for each to complete.

The event loop blocks until all I/O operations are complete before processing the next event.

The event loop runs on multiple threads to handle I/O operations in parallel.

The event loop processes events in a random order to maximize performance.

LPI Web Development Essentials

Domain 5Objective 1

035.1 NodeJS Basics (weight: 1) WEB-DEVELOPMENT-ESSENTIALS Practice Questions (Page 5)

Part of the 035 NodeJS Server Programming domain, which makes up ~15% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 60-minute exam (~25–40 total, ~4–6 in this domain), expect 1–2 from this objective — we provide 26 practice questions to prepare you well beyond it. (estimate)

26questions here

6free pages

5concepts

Questions 21–25

21foundation · easy
A file named hello.js contains: console.log('Hello, world!');. What is the expected output when you run node hello.js?
Select an answer first
22foundation · easy
What is the primary purpose of Node.js's non-blocking I/O model?
Select an answer first
23application · medium
A developer is explaining Node.js to a colleague and says it is 'event-driven and non-blocking'. What does this mean in practice?
Select an answer first
24application · easy
A developer has a file named `app.js` that contains a simple `console.log('Hello')` statement. They run `node app.js` from the terminal. What is the expected output?
Select an answer first
25application · easy
A developer has a project with a package.json file but no node_modules directory. They want to install all the dependencies listed in package.json. Which command should they run?
Select an answer first

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035.1 NodeJS Basics (weight: 1) WEB-DEVELOPMENT-ESSENTIALS Practice Questions (Page 5)

Questions 21–25

A file named hello.js contains: console.log('Hello, world!');. What is the expected output when you run node hello.js?

What is the primary purpose of Node.js's non-blocking I/O model?

A developer is explaining Node.js to a colleague and says it is 'event-driven and non-blocking'. What does this mean in practice?

A developer has a file named `app.js` that contains a simple `console.log('Hello')` statement. They run `node app.js` from the terminal. What is the expected output?

A developer has a project with a package.json file but no node_modules directory. They want to install all the dependencies listed in package.json. Which command should they run?

Keep studying — 035 NodeJS Server Programming