CDN Introduction The full name of CDN is Content Delivery Network, that is, content distribution network. The CDN system can redirect the user's request to the nearest service node according to the network traffic, the connection of each node, the load status, the distance to the user, the response time and other comprehensive information of each node in real time by placing node servers on the network to form an intelligent virtual network on the basis of the existing Internet. working principle The user accesses the domain name, and the browser checks the local DNS cache. If not, the user requests the DNS server. DNS domain name resolution sets CNAME and points to xxx.yyy.com, that is, the request points to the intelligent DNS load balancing system in the CDN network. The intelligent DNS load balancing system resolves the domain name and returns the IP node with the fastest response speed to the user. The user initiates a request to the IP node. For the first visit, the CDN server will request the original web site and cache the content. Product architecture |
