Khan Academy The Internet Practice Test

A CDN works by bringing content closer to users to speed things up. It places copies of your static resources on many servers around the world, so when someone in another country requests a page, the CDN serves from the closest server. That shortens the distance data has to travel, reduces the number of network hops, and lowers the time it takes for the page to start loading. This leads to faster load times and a better user experience for people worldwide. A CDN also helps by taking some of the load off the origin server, especially during traffic spikes, and it can improve reliability. It doesn’t increase the size of the origin server; in fact, it reduces direct requests to it. DNS resolution is still used to locate the nearest edge server, not eliminated. And it doesn’t force everyone to download from a single server—they’re distributed across many edge locations.