Shulou(Shulou.com)05/31 Report--

Today, I will talk to you about the concept and principle of CDN, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

1. Brief introduction of CDN: the full name of CDN is Content Delivery Network, that is, content delivery network. The basic idea is to avoid the bottlenecks and links that may affect the speed and stability of data transmission on the Internet as far as possible, so as to make the content transmission faster and more stable. By placing node servers everywhere in the network to form a layer of intelligent virtual network based on the existing Internet, the CDN system can redirect the user's request to the nearest service node in real time according to the comprehensive information such as network traffic, connection of each node, load status, distance to the user and response time. Its purpose is to enable users to get the content they need nearby, solve the situation of Internet network congestion, and improve the response speed of users visiting the website.

To put it simply, content distribution network is a strategically deployed overall system, including distributed storage, load balancing, network request redirection and content management, while content management and global network traffic management are the core of CDN. By judging the proximity of users and server load, CDN ensures that content serves users' requests in a very efficient way.

In general, the content service is based on a cache server, also known as proxy caching, which is located at the edge of the network and is only "one hop" away from the user. At the same time, the proxy cache is a transparent mirror of the content provider's source server. Such an architecture enables CDN service providers to provide the best possible experience to end users on behalf of their customers, content providers, who cannot tolerate any delay in request response time.

2. What are the benefits of using CDN?

1. You don't have to worry about your website visitors, you can quickly open the website at any time, anywhere, any network operator.

two。 All kinds of server virtual host bandwidth and other procurement costs, including later operation and maintenance costs will be greatly reduced.

3. The direct benefits to the website are: traffic, consultation volume, customer volume, order volume, will be greatly increased.

3. The principle of CDN.

Reverse proxy (Reverse Proxy) means that a proxy server is used to accept the connection request on the internet, then the request is forwarded to the server on the internal network, and the result obtained from the server is returned to the client requesting the connection on the internet. At this time, the proxy server is externally represented as a node server. By deploying more reverse proxy servers, we can achieve the effect of multi-node CDN.

4. Working principle

5. Simple system architecture diagram:

Summary: CDN can select the nearest server to respond based on the request source address. In this way, at any time, anywhere, any network operator, you can quickly open the website.

Secondly, CDN can cache some hot static resources, which not only speeds up the request response speed, but also greatly reduces the pressure on the back-end server.

After reading the above, do you have any further understanding of the concept and principle of CDN? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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