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The full name of CDN is Content Delivery Network, that is, content delivery network. CDN is an intelligent virtual network based on the existing network. Relying on the edge servers deployed everywhere, through the load balancing, content distribution, scheduling and other functional modules of the central platform, users can get the content they need nearby, reduce network congestion, and improve the response speed and hit rate of user access. The key technologies of CDN are content storage and distribution technology.

1. The technical principle of cdn

1. The user provides the browser with the domain name to access the website, and the domain name resolution request is sent to the DNS server used by the local user, and the local DNS server forwards the resolution request to the DNS server (NS) of the website.

2. Because the DNS server (NS) of the website sets CNAME for the resolution of this domain name, the request is eventually directed to the GLB system in the CDN network.

3. The GLB system intelligently parses the domain name and returns the node IP with the fastest response to the user.

4. After getting the actual IP address, the browser sends an access request to the CDN node

5. Since this is the first visit, the CDN node will return to the origin server to obtain the data requested by the user and send it to the user. At the same time, the CDN node will cache the data according to the caching policy.

6. When other users access the same content again, the CDN node returns the data directly to the customer and completes the request / service process.

2. What are the factors that affect the acceleration effect of cdn

1.CDN mainly depends on caching the content of the website to each node server, and visitors from different regions can access it nearby, which has an accelerated effect. So, in theory: the more content on your site is cached, the better.

two。 When a user accesses some content that cannot be cached, the CDN node will temporarily go to your origin server to obtain it. At this time, if the link to your origin server is not good, the process will be very slow. Therefore, the status of your origin link is also more important.

3. It still has something to do with the quality of service of CDN. Degree includes its intelligent scheduling, CDN node link status and so on.

What is the technical principle of cdn is shared here, I hope that the above content can have a certain reference value for everyone, you can learn to apply. If you like this article, you might as well share it for more people to see.

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