Q11. How does code splitting produce chunks?
Code splitting divides the bundle so the browser downloads only what a route or interaction needs. Bundlers detect dynamic import() and create a separate chunk for that m...
Technical Question Bank · Peer-Reviewed
Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (20 available).
Active:
Tag: cac ×
Q12. What is the difference between CAC and LTV, and why does their ratio matter?
CAC is the cost of acquiring one customer. LTV is the profit that customer generates over their lifetime. Their ratio tells you whether growth is sustainable. I calculate...
Q13. How do HTTP caching and CDNs improve performance?
Caching avoids re-downloading assets and is one of the cheapest performance wins. Use content-hashed filenames with a long Cache-Control: public, max-age=31536000, immuta...
Q14. How do you prevent a cache stampede or thundering herd?
A stampede happens when a popular key expires and many clients simultaneously hit the database to rebuild it. Several mitigations exist. - Locking or mutex: only the firs...
Q15. How do the different Next.js caches and revalidation layers work?
Next.js has several cache layers. The Data Cache stores individual fetch results and can be tagged. The Full Route Cache stores rendered HTML and RSC payloads for static ...
Q16. How does HTTP caching work with Cache-Control and ETag?
HTTP caching lets browsers and proxies reuse responses. `Cache-Control` sets the policy: - `max-age=300`: fresh for 300 seconds; no revalidation needed. - `s-maxage`: ove...
Q17. How does a CDN improve performance and how would you design for it?
A content delivery network caches content on edge servers close to users, reducing latency and offloading the origin. How it works: DNS or anycast routes the user to a ne...
Q18. How do fetch cache options work in the App Router?
The `fetch` API in server components supports caching controls via `{ next: { revalidate } }` and cache modes like `cache: 'no-store'` or `cache: 'force-cache'`. Use `no-...
Q19. How cache works in Next.js with the Pages Router?
Next.js uses a built-in caching mechanism for static assets and API routes. You can also implement custom caching strategies using HTTP headers or libraries like `next-ca...
Q20. Cache revalidation in Next.js with the Pages Router?
Cache revalidation can be handled using the `revalidate` option in `getStaticProps` or by setting appropriate HTTP headers in API routes. - **Using `revalidate`**: Automa...