CDN Basic Concept and Design – System Design 12
CDN is a group of proxy servers (Proxy Server) placed based on geographical location. Among them, the proxy server is an intermediate server between the client and the server, and the proxy server will also be placed at the network edge (Network Edge). Also because the edge of the network is close to the end user, the placement of the proxy server helps to quickly transmit the corresponding data to the user by reducing delays and saving bandwidth. In addition to serving as simple proxy servers, CDNs can also make them more efficient through some settings and operations.
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Technical Article, System Design