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 will encounter the problem of how to develop CDN effectively in the process of practical application of CDN, and know which types of CDN are the basis of effective development of CDN.

What cdn types do you have? The CDN system can redirect the user's request to the nearest service node according to the comprehensive information such as network traffic, connection of each node, load status, distance to the user and response time.

The purpose of cdn technology is to enable users to get the content they need nearby, solve the congestion of Internet network, and improve the response speed of users visiting the website. CDN can solve the access delay problems caused by distribution, bandwidth and server performance, and is suitable for various scenarios such as site acceleration, VOD, LVB and so on.

The implementation of CDN can be divided into three types: mirror, cache and direct connect.

Mirror site

It allows content to be published directly, and is the most common, suitable for static and quasi-dynamic data synchronization. However, the cost of purchasing and maintaining the new server is high, and mirror servers must be set up in each region, equipped with professional and technical personnel for management and maintenance. For large websites, the cost of updating bandwidth has also been greatly increased.

High-speed cache

Low cost, suitable for static content. Some data show that more than 80% of users often visit 20% of the content of the website. under this rule, the cache server can handle the static requests of most customers. the original server only needs to handle about 20% of non-cache requests and dynamic requests, which greatly speeds up the response time of customer requests and reduces the load on the original server.

Dedicated line

By allowing users to access the data source directly, the dynamic synchronization of data can be realized. At the same time, the implementation of CDN depends more on network technology, such as load balancing technology, dynamic content distribution and replication technology, cache technology and so on.

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