Full-Stack Development Technology & Digital Applications 4

Question 1

Which caching strategy serves a cached response immediately and then updates the cache in the background from the network?

Accepted Answer

Stale-while-revalidate

Answer

Stale-while-revalidate returns the cached (potentially stale) response instantly while simultaneously fetching a fresh version for the next request.

Question 2

In React, what is the purpose of the `key` prop when rendering lists?

Accepted Answer

It helps React identify which items changed, were added, or removed to optimize reconciliation

Answer

React uses the `key` prop to match elements between renders, avoiding unnecessary re-creation of DOM nodes when the list changes.

Question 3

What does the CAP theorem state about distributed databases?

Accepted Answer

A distributed system can guarantee at most two of: consistency, availability, and partition tolerance

Answer

CAP theorem (Brewer's theorem) proves that a distributed data store can only guarantee two of the three properties when a network partition occurs.

Question 4

Which HTTP method is idempotent but NOT safe (it may modify server state)?

Accepted Answer

PUT

Answer

PUT is idempotent (calling it multiple times produces the same result) but not safe because it modifies or creates a resource on the server.

Question 5

In a single-page application (SPA), what problem does code splitting solve?

Accepted Answer

It divides the bundle into smaller chunks loaded on demand, reducing initial load time

Answer

Code splitting allows the bundler to create multiple smaller bundles that load lazily when needed, improving Time to Interactive for large applications.

Full-Stack Development Practice Test

Full-Stack Development Practice Test

Full-Stack Development Technology & Digital Applications 4