Basic knowledge

What is CDN？

CDN (content delivery network), a system mainly used for content distribution, is a mechanism used to improve the speed of file download. Enable users to download from the nearest CDN server, reduce the number of routes, improve the download speed, shorten the transmission time, and improve the user experience.

How does CDN work？

The basic principle of CDN is to set up some cache servers in areas and networks where users visit relatively concentrated. When the user accesses the website, the global load balancing technology is used to direct the user's access to the nearest cache server, and the cache server responds to the user's access request instead of the source station. In this way, on the one hand, the work pressure of the origin server is reduced, and on the other hand, the user can obtain the required content nearby, solve the congestion of the Internet network, and improve the response speed of the user accessing the website.