In THE IDC industry, we often hear some related terms about CDN, high defense CDN, CDN acceleration server, CDN node and so on, so today we will understand what the following CDN is, why to use CDN, how to use CDN.
What is CDN technology
CDN is Content Delivery Network. It adds a new layer of network architecture in the existing network structure through a way of cache redundancy, and stores part or all of the content of the website to the nearest network server of the user, so that the user can get the website content nearby.
The basic principle of CDN is widely used in a variety of the cache, the cache server distribution to the user to access relatively concentrated area or in the network, when users visit the web site, using the global load technology to the user’s access point to the nearest work cache server, directly by the cache server response to user requests.
What is using CDN
In today’s world, websites must do everything for everyone: they must be attractive, fast, flexible and mobile, and even capable of changing. It also has to support frequent sessions, a variety of browsers, smartphones, tablets, and any other device a user might use. Site must be able to run in the complex under the network environment, geographically dispersed, distant and network diversity, sites use more and more objects, the system will change more and more slow, users can only access to some of the most open, performance is the best website, if your website every seconds slower, it may lead to lost many visitors, even some clients will not come again.
Therefore, CDN comes into being at this time. They can help users improve the browsing performance of websites, the fluency of games, the accuracy and fluidity of transactions in the financial industry and even the banking industry.
How to use CDN
There are generally two ways to use CDN: image server and cache. Mirror server means that the website itself in the establishment of a mirror cache server, can process some dynamic data cache, but because of maintenance costs and bandwidth costs, and even need to join the cost of adjusting the architecture, so the general website will not establish a mirror server. The cost of caching is much lower and is suitable for caching static content.