This may be measured by choosing locations that are the fewest hops, the lowest number of network seconds away from the requesting client, or the highest availability in terms of server performance (both current and historical), to optimize delivery across local networks. When optimizing for performance, locations that are best for serving content to the user may be chosen. Requests for content are typically algorithmically directed to nodes that are optimal in some way. Others build a global network and have a small number of geographical PoPs. The number of nodes and servers making up a CDN varies, depending on the architecture, some reaching thousands of nodes with tens of thousands of servers on many remote points of presence (PoPs). Benefits include reducing bandwidth costs, improving page load times, and increasing the global availability of content.
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In turn, a CDN pays Internet service providers (ISPs), carriers, and network operators for hosting its servers in their data centers.ĬDN is an umbrella term spanning different types of content delivery services: video streaming, software downloads, web and mobile content acceleration, licensed/managed CDN, transparent caching, and services to measure CDN performance, load balancing, Multi CDN switching and analytics and cloud intelligence. Content owners such as media companies and e-commerce vendors pay CDN operators to deliver their content to their end users. ĬDNs are a layer in the internet ecosystem. Since then, CDNs have grown to serve a large portion of the Internet content today, including web objects (text, graphics and scripts), downloadable objects (media files, software, documents), applications ( e-commerce, portals), live streaming media, on-demand streaming media, and social media sites. CDNs came into existence in the late 1990s as a means for alleviating the performance bottlenecks of the Internet as the Internet was starting to become a mission-critical medium for people and enterprises.
The goal is to provide high availability and performance by distributing the service spatially relative to end users.
A content delivery network, or content distribution network ( CDN), is a geographically distributed network of proxy servers and their data centers.
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