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

Compared with other CDN service providers, the main advantages of CDN include stability and speed, high cost performance, ease of use, high efficiency and intelligence. More users will ask about the advantages of stability and speed. Generally speaking, CDN is characterized by sharing the pressure of the source station, avoiding network congestion, ensuring the acceleration of the distribution of website content in different regions and different scenarios, and improving the access speed of resources. The following introduces the principle of CDN dynamic acceleration.

What is the principle of cdn dynamic acceleration? cdn stands for Content Delivery Network, i.e. Content Delivery Network. The purpose is to add a new CACHE layer to the existing Internet, and publish the content of the website to the node closest to the user's network "edge", so that the user can get the required content nearby and improve the response speed of the user's visit to the website.

cdn comprehensively solves the technical problems caused by small network bandwidth, large user visits and uneven distribution of network points, and improves the response speed of users visiting websites. CDN network is to add Cache layer between users and servers, mainly by taking over DNS implementation, the user's request will be directed to the Cache to obtain the data of the source server. After using CDN cache, the visit process of the website becomes:

1. The user enters the domain name to access, and the operating system queries LocalDns for the ip address of the domain name.

2. LocalDns queries ROOT DNS for the authoritative server for the domain name (assuming LocalDns cache expires here)

3. ROOT DNS responds the domain name authorization dns record to LocalDns, LocalDns obtains the domain name authorization dns record and continues to query the domain name IP address from the domain name authorization dns.

4. Domain name authorization dns queries domain name records (usually CNAME) and responds to LocalDns. LocalDns queries IP address of domain name from intelligent scheduling DNS after obtaining domain name records.

5. Intelligent scheduling DNS responds the IP address of the most suitable CDN node to LocalDns according to certain algorithms and policies (such as static topology, capacity, etc.), LocalDns responds the obtained IP address of the domain name to the user, and after the user obtains the IP address of the domain name, he accesses the site server.

6. The CDN node server responds to the request and returns the content to the client. (The cache server saves locally for later use on the one hand, and returns the acquired data to the client on the other hand to complete the data service process)

This is the answer to the cdn dynamic acceleration principle.

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