CDN (content distribution network) server has a variety of functions, which aims to optimize and accelerate network content transmission and improve user experience. The following is the main function of the CDN server:

　　Content cache: CDN server caches static content such as images, scripts, and style tables to servers around the world. When the user requests these contents, the CDN server can be obtained from the server closest to the user, thereby reducing the transmission distance and network delay, and increasing the loading speed.

　　Accelerating content transmission: By distributing the content on the server closer to the user, the CDN server can accelerate the transmission of content. This is very helpful for large documents, multimedia content and dynamic content.

　　Load balancing: The CDN server can use the user's geographical location and server load to achieve the load balancing on the optimal server to achieve the load balancing, thereby reducing the load of the source server.

　　Anti -DDOS attack: Some CDN providers can help resist the distributed rejection service (DDOS) attack by decentralizing traffic and blocking malicious traffic.

　　Improvement of security: The CDN server can provide some security functions, such as SSL encryption and preventing caching pollution to protect the security and integrity of data transmission.

　　Short the loading time of the page: By accelerating content transmission and reducing network delay, the CDN server can help shorten the loading time of the webpage, increase the user experience, and reduce the user's loss rate.

　　Dynamic content acceleration: In addition to static content, some CDNs also support the acceleration of dynamic content, such as cached the dynamicly generated content and transmitted to the user.

　　Large large files: CDN server is suitable for distributing large files, such as software updates, video flow, etc. They can reduce the load of the source server and increase the download speed.

　　Real -time monitoring and reporting: Some CDN providers provide real -time monitoring and reporting functions to allow administrators to understand the performance and effects of content transmission.

　　In short, the main function of the CDN server is to improve network performance and user experience through cache, acceleration and optimization content transmission. This is very good for websites, applications, multimedia content and online services. Different CDN providers may provide different functions, so they need to be evaluated according to their needs when choosing a CDN solution.