Shulou(Shulou.com)06/03 Report--

Content distribution network (Content Delivery Network, referred to as CDN) is a distributed network, which is established and covered on the bearer network, and is composed of server groups of edge nodes distributed in different areas. CDN shares the pressure on the origin server, avoids network congestion, ensures that the distribution of website content is accelerated in different regions and different scenarios, and improves the speed of resource access. Many users need to understand the concept of CDN before they choose to buy CDN services before they can understand the principle of CDN acceleration more clearly.

What does cdn mean? In the past, when we opened the web page, we always encountered the situation that the video was buffered and the pictures could not be loaded. How do service providers avoid such a situation nowadays? This is the content delivery Network (Content Delivery Network), or CDN for short.

To put it simply, CDN is one or more servers that store some static files and save the files by copying the cache and so on.

Static file

Css,html, pictures and media all belong to static files, that is, the requests sent by users will not affect the contents of static files, while files such as jsp,php do not belong to static files, because their content will change due to our request.

How to accelerate CDN

Usually, the data we want is obtained from the primary server, but if our primary server is in the south and the access users are in the north, then the access speed will be relatively slow for many reasons, such as transmission distance, operator, bandwidth and so on.

Using CDN technology, we will distribute CDN nodes all over the place. When the user sends a request to the server, the server will assign the nearest CDN server to the user according to the user's regional information.

CDN data sources include replication, caching, and CDN servers can cache files after user requests, or actively grab the contents of the master server. Including CDNS distributed in different places.

The above is an introduction to what cdn means.

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