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First acquaintance with CDN
2022-07-06 05:19:00 【Xingtao】
Baidu general science :CDN The full name is Content Delivery Network, The content distribution network .CDN It is an intelligent virtual network based on the existing network , Rely on edge servers deployed everywhere , Load balancing through the central platform 、 content distribution 、 Scheduling and other functional modules , Let users get the content they need nearby , Reduce network congestion , Improve user access response speed and hit rate .CDN The key technologies are content storage and distribution technology .
Why is there CDN?
Browser sends request to server , There are many nodes in the middle , When the browser is too far away from the server , Packet loss may occur during the transmission of the request 、 Blocking and so on , Therefore, multiple servers will be established in various places , Thus reducing the number of nodes between requests .
The edge server is the server closest to the user ,CDN It can handle static content and dynamic content , When the browser requests static content, it can directly return , When dynamic content is requested, the source server is needed .
Establish multiple CDN The server , Using load balancing technology , If overloaded, switch to other CDN On , guarantee CDN Safety and reliability of . Through anycast communication , These multiple CDN Have the same IP Address , By the nearest CDN Provide services . So when users visit , In fact, we will arrive first CDN Load balancing server
Reference material :
b Stand technical egg teacher : When CDN?
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