Q1. What does a CDN cache and how does it help?
A content delivery network caches content on edge servers close to users. It serves static assets such as images, CSS, JavaScript and fonts, and can cache dynamic respons...
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Q2. 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...
Q3. 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...
Q4. How would you design a multi-level caching architecture?
Layer caches by distance from the caller and accept that each layer adds staleness and invalidation complexity. Typical design: - Edge/CDN: cache public and static respon...