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This article mainly explains "what is the function and function of CDN acceleration service". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what is the function and function of CDN acceleration service"?

What is CDN?

CDN is the abbreviation of Content Delivery Network, which means "content distribution network". Generally speaking, what we call CDN acceleration generally refers to the acceleration of websites or users' downloading resources.

The basic idea of CDN 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.

The core purpose of CDN is to enable users to access the network nearby, obtain the required content, solve the situation of network congestion, and significantly improve the response speed or download speed of users visiting the website.

From the above professional point of view, many rookies may not know what CDN means, the following editor is easy to understand again.

To put it simply, CDN is acceleration. When a website turns on CDN acceleration, it gives users the impression that the speed of accessing the site or downloading things is significantly faster, faster or faster than without acceleration.

Why is it faster for CDN users to visit a website? Because CDN distributes the content of the origin server to all nodes in the country, it shortens the delay of users viewing objects, improves the response speed of users visiting the website and the usability of the website, and solves the problems of small network bandwidth, large number of user visits and uneven distribution of sites.

To put it simply, when a website opens CDN, users visit the site, not directly to the original server of the site, but to the nearest server node distributed by a server, because the server is close to you, so the access speed or download speed will be faster.

Do you remember how to set up DNS? It is also mentioned that the DNS server address must fill in the IP of the nearest place to you, which is the nearest principle, which is easy to understand, such as why it is slow to visit foreign websites at home. The main reason is that the distance is too far. The mission of CDN is to store website content on CDN nodes all over the country or even all over the world. When users visit the website, they can get the cached content on CDN nearby, so as to improve the access speed.

What is the use of CDN acceleration?

-- benefits to visitor users

For users, if a site opens CDN, the user's access speed or download speed will be faster than when it is not open. Generally speaking, as long as the websites that are better at present, they will turn on the CDN function, mainly to enhance the user experience.

Benefits to the website

For websites or webmasters, opening CDN can not only improve the opening speed of the site, but also enhance the user experience. More importantly, turning on CDN can reduce the broadband pressure on hacker tools and servers.

After CDN is enabled, users in different regions will visit different servers, while the real server (source server) of the website is generally only accessed by the CDN node. The CDN node servers visited by users all over the country do not directly access the source server. In this way, you can introduce the broadband resources of the website server and reduce the server pressure.

In addition, due to the intermediate blocking protection of CDN nodes, the security of the original server can be better protected. In other words, CDN provides a stand-in for the user's origin server in the security cloud, whether it is penetration or DDoS attack, the target will be the CDN node stand-in, thus protecting the website origin server.

How to see if a website has enabled CDN acceleration? This is very simple, as long as you use a test tool to test the national access speed of the site, if the IP address accessed in different regions is different, it means that the site has enabled CDN acceleration. For example, (www.yisu.com) enabled CDN acceleration a long time ago. You can use the "Cloud testing" tool for online testing. After testing, you can see that users in different regions visit different IP, as shown in the figure below.

At this point, I believe you have a deeper understanding of "what is the function and role of CDN acceleration service". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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