Design a Content Delivery Network · System Design Interview

Design a Content Delivery NetworkDesign a CDN: a network of edge servers caching an origin’s content close to visitors, so most requests never reach the origin at all.What it has to do

A visitor’s request for a cacheable object is served from a nearby edge, not the origin

An edge with no copy of the object fetches it once and caches it for the visitors behind it

An object can be invalidated across every edge that is holding it

Scale

Edge locations: 300

Requests per second globally: 10 million

Out of scope

The origin application itself

DNS resolution beyond routing to an edge

DDoS mitigation

Video-specific packaging

Practise this challengeAll system design challenges

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