what is cdn

CDN is the abbreviation of Content Distribution Network, a distributed network architecture that distributes content to server nodes around the world to increase content transmission speed, reduce network latency, reduce server load, and improve website reliability. With a network architecture that is resilient and resistant to attacks, through CDN, users can access the required content more quickly, improving the user experience and improving the performance and security of the website.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

CDN is the abbreviation of Content Delivery Network. It is a distributed network architecture designed to provide high-speed, high-performance content transmission services. CDN enables users to access and obtain the content they need faster by distributing data and content to server nodes around the world.

In a traditional network environment, when a user requests to access a website or download a file, the content is usually obtained directly from the source server. There are some problems with this transmission method, such as long distance, network congestion, high server load, etc., which lead to a decline in user experience. The emergence of CDN is to solve these problems.

The working principle of CDN is to cache the content on the source server to server nodes distributed around the world. When a user initiates a request, the CDN will select the server node closest to the user to process the request based on the user's geographical location. This can greatly shorten the distance of data transmission, reduce network delay, and improve user access speed.

The advantages of CDN are mainly reflected in the following aspects:

Accelerate content transmission: CDN enables users to obtain content from closer servers by caching content on distributed servers. It reduces the time and distance of data transmission, increases the loading speed of content, and improves the user experience.

Reduce the load on the source server: CDN distributes content to different node servers and distributes user requests to different servers for processing, reducing the load pressure on the source server and improving the performance and stability of the server.

Improve website reliability: CDN adopts a distributed architecture. When a node server fails or the network is interrupted, other node servers can continue to provide services, ensuring the availability and reliability of the website.

Resist DDoS attacks: CDN can distribute requests to different server nodes and spread the attack traffic to multiple servers for processing, thereby reducing the attack pressure on the source server and improving the security of the website.

Support multimedia content transmission: CDN can effectively handle the transmission of multimedia content such as large files, videos, and audios. Through nearby distribution, it ensures smooth playback and high-quality transmission of multimedia content.

CDN is widely used on the Internet. Whether it is a website, mobile application, e-commerce platform or online video, game, etc., CDN can be used to provide faster and more reliable content transmission services. For global enterprises and websites, CDN is an indispensable infrastructure.

In summary, CDN is a network architecture that distributes content to server nodes around the world to increase content transmission speed, reduce network latency, reduce server load, improve website reliability, and resist attacks. . Through CDN, users can access the required content more quickly, which improves the user experience and also improves the performance and security of the website.

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