7.1 What is CDN?
Posted by Pinky Lee on 25 April 2016 05:45 PM
What is CDN?
A Content Delivery Network or Content Distribution Network (CDN) is a globally distributed network of proxy servers deployed in multiple data centers. The goal of a CDN is to serve content to end-users with high availability and high performance. CDNs serve a large fraction of the Internet content today, including web objects (text, graphics and scripts), downloadable objects (media files, software and documents), applications (e-commerce, portals), live streaming media, on-demand streaming media, and social networks.
Nowadays the Internet allows users around the world to get content from the other side of the world. The content packets are transmitted to the end user through a series of nodes and public network cables. Thus the latency can be affected by the transit distance. To reach web performance optimization, CDN is one of the best solutions. CDNs place servers around the world and server the users with date from the closest or most appropriate CDN nodes, depending on end users’ location. Therefore, it can reduce a number of nodes effectively when processing requests. This equates to network latency reduction and transmission speed improvement.
Here we give you two examples to compare, then you will get the whole idea easily.
User requested origin to provide content. Users receive content by transmitting a series of nodes.
With CDN service:
User requested origin to provide content. Users receive content from the nearest node directly.
The main job of CDN service is to improve transfer performance. CDN nodes cooperate with among each other to optimize the delivery process to meet the users’ requests.Therefore, the larger the CDN nodes range is, the better the performance will be.
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