Full-Stack Development Developer 5

Question 1

What is the purpose of a Content Delivery Network (CDN) in a full-stack application?

Accepted Answer

To cache and serve static assets from servers geographically close to the user

Answer

A CDN distributes cached static assets (images, JS, CSS) from edge nodes near users, reducing latency and origin server load.

Question 2

In TypeScript, what is the difference between `interface` and `type`?

Accepted Answer

`interface` can be extended and merged via declaration merging; `type` can represent unions and intersections more flexibly

Answer

Interfaces support declaration merging and are preferred for object shapes, while type aliases can express unions, intersections, and mapped types more flexibly.

Question 3

What is server-side rendering (SSR) and when would you choose it over client-side rendering (CSR)?

Accepted Answer

SSR generates HTML on the server per request; choose it when SEO and initial load time are priorities

Answer

SSR delivers fully rendered HTML from the server so search engines can index content and users see meaningful content faster.

Question 4

What does the `useCallback` hook do in React?

Accepted Answer

Returns a memoized version of a callback function that only changes when its dependencies change

Answer

`useCallback` memoizes a function reference so that child components receiving it as a prop don't re-render unnecessarily.

Question 5

Which SQL clause would you use to filter aggregated results after a `GROUP BY`?

Accepted Answer

HAVING

Answer

`HAVING` filters groups after aggregation, while `WHERE` filters individual rows before grouping occurs.

Full-Stack Development Practice Test

Full-Stack Development Practice Test

Full-Stack Development Developer 5