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01 ·Networking·★ MEMBER·11 min read DNS and CDNs — What Happens Between Enter and Pixels In the second or so between pressing Enter and seeing a page, a name gets resolved down a tree, four layers of cache get consulted, and an edge server somewhere near you answers instead of the origin. Here is how DNS walks that tree, what a TTL does not promise, and how a CDN talks its way around the speed of light — from zero background.