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

Compared with other CDN service providers, the main advantages of CDN include stable and fast, cost-effective, easy to use, efficient and intelligent. More users will ask about the advantage of stability and speed. Generally speaking, CDN is characterized by sharing the pressure on the origin server, avoiding network congestion, accelerating the distribution of website content in different regions and different scenarios, and improving the speed of resource access. The following is an introduction to which technologies support CDN acceleration mainly depends on.

How to accelerate cdn? By adding a new network architecture to the existing Internet, cdn publishes the content of the website to the "edge" of the network closest to the user, so that users can get the content they need nearby and improve the response speed of users visiting the website.

The implementation of CDN needs to rely on the support of a variety of network technologies, related technologies of CDN:

Load balancing technology

Load balancing technology is not only used in CDN, but also widely used in many areas of the network, such as server load balancing, network traffic load balancing. As the name implies, load balancing in the network is to distribute the network traffic to several servers or network nodes that can complete the same task as evenly as possible, so as to avoid the overload of some network nodes. This can not only improve the network traffic, but also improve the overall performance of the network. In CDN, load balancing is divided into server load balancing and server overall load balancing.

Server load balancing refers to the ability to assign tasks among servers with different performance, which can not only ensure that the servers with poor performance do not become the bottleneck of the system, but also ensure that the resources of high-performance servers are fully utilized. The overall load balancing of the server allows Web network hosts, portal sites, and enterprises to allocate content and services according to geographical location. Improve fault tolerance and availability through the use of multi-site content and services to prevent failures caused by local or regional network outages, power outages, or natural disasters. In the CDN scheme, the overall load balancing of the server plays an important role, and its performance directly affects the performance of the whole CDN.

Dynamic content Distribution and replication Technology

As we all know, the response speed of website access depends on many factors, such as whether there is a bottleneck in the network bandwidth, whether there is congestion and delay in the route during transmission, the processing capacity and access distance of the website server, and so on. In most cases, the response speed of the website is closely related to the distance between the visitor and the website server. If the distance between the visitor and the website is too far, the communication between them also needs to be forwarded and processed by heavy routing, and network delay is inevitable.

An effective method is to use content distribution and replication technology to copy most of the static web pages, images and streaming media data which account for the main body of the website to the accelerated nodes. Therefore, dynamic content distribution and replication technology is also a major technology needed by CDN.

Caching technology

Caching technology is not a new technology. Web caching service improves the response time of users in several ways, such as proxy caching service, transparent proxy caching service, transparent proxy caching service using redirect service and so on. With the Web caching service, users can minimize WAN traffic when visiting web pages. For corporate intranet users, this means caching content locally rather than retrieving web pages over a dedicated WAN.

For Internet users, this means storing content in their ISP cache without having to retrieve web pages through Internet. This will undoubtedly improve the access speed of users. The core function of CDN is to improve the access speed of the network, so cache technology will be another major technology adopted by CDN.

The above is the arrangement of how to accelerate cdn and related technologies.

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