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

After purchasing the CDN service, users will be more concerned about the actual effect in the process of using it. First of all, you need to make sure that it has been activated successfully, and then follow the basic steps to add accelerated domain names and configure CNAME. After all these have been successfully completed, CDN can be used normally. Many users have a question, which is often asked, and that is the CDN principle.

What is the principle of cdn? Cdn is a network acceleration combination technology, which includes origin server, cache server, intelligent DNS, client and so on. The main principle of the technology is that when an x network user visits a site accelerated by CDN, the domain name is queried from the local DNS, and eventually the IP address corresponding to the accessed domain name may be obtained from the global intelligent DNS server, that is, the IP of the x network cache server. Then the browser of the x-net user initiates an access request to the x-net cache server, and the required default page file is cached in the x-net cache server, so the cache server immediately returns the data and completes the access request.

The web page access process accelerated with cdn:

1. The user provides the browser with the domain name to access.

two。 The browser calls the domain name resolution library to resolve the domain name. Because cdn adjusts the domain name resolution process, the resolution function library generally gets the corresponding CNAME record of the domain name. In order to get the actual IP, the browser needs to resolve the obtained CNAME domain name again; in this process, the global load balancer DNS resolution is used to resolve the corresponding IP address according to the geographical location information, so that users can access it nearby.

3. This resolution obtains the IP address of the CDN cache server. After getting the actual IP address, the browser sends an access request to the cache server.

4. According to the domain name to be accessed by the browser, the cache server obtains the actual IP address of the domain name through Cache internal private DNS resolution, and then the cache server submits an access request to the actual IP.

5. After the cache server gets the content from the actual IP address, one is to save it locally for later use; the other is to return the obtained data to the client to complete the data service process; the client gets the data returned by the cache server and displays it to complete the whole browsing process.

The above is an introduction to the implementation of the principle of cdn. On the one hand, the acceleration technology of cdn improves the speed of users to visit web pages, on the other hand, it also strengthens the brand maintenance of enterprises, which is a high-quality network acceleration technology.

If there is anything else you need to know, you can find our CDN technical engineer on the official website. CDN technical engineer has more than ten years of experience in the industry, so it will be more detailed and professional than the editor's answer. Official website link www.yisu.com

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