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Today, I would like to share with you the relevant knowledge about what the cdn server is useful. the content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look.

Introduction

CDN, the English full name is Content Delivery Network, that is, content distribution network (or content delivery network), this is a technology used to improve the quality of the Internet.

Corresponding knowledge of Internet

First, let's talk about the structure of the Internet. As shown in the figure above, the Internet is actually made up of a bunch of routers connected. Like a company or school, a whole area of computers are connected by a router in a tree structure to form a local area network. The local area network of the same city is connected through a router to form a metropolitan area network (intercity network). The connection between cities through routers constitutes a wide area network (that is, the Internet, ranging from country-to-country connections to city-to-city connections. Usually cities are connected first to form a national wide area network and then to other countries). The metropolitan area networks are connected by the Internet trunk road.

The emergence of problems

So, when we access a server located in another metropolitan area network, we have to go through the route shown in the red line above. However, the total bandwidth of the trunk road is limited, if all the files needed by a web page are transferred through the trunk road, then the trunk road will become congested, so it will often lead to slow response or even packet loss. At this time, developers are powerless to optimize the line, they can only optimize the project to make the user experience better, so the special cdn company was born in 1999 (the concept of cdn was put forward in 1986).

How does cdn solve the problem

Cdn's solution to the problem is also very simple. Since the trunk road is congested, deploy the server on the intercity network, so that users can reduce the data that needs to be transferred to a relatively small situation when making cross-city requests (but not all things can be put on the intercity server, usually some static resources, such as static HTML and images). In this way, when the user needs to access the remote server to get the data, the server will select an appropriate cdn nearby to return the static content to the user, and then the remote server only needs to return the main data. This not only greatly reduces the bandwidth consumption of the main road, but also reduces the pressure on the server.

How do we use cdn

We are just learners and do not have the financial resources to deploy a lot of cdn, but we can also use these cdn (as mentioned above, there are special companies doing cdn). For example, when we use files like element-UI or vue.js, we can search for the corresponding cdn on Baidu and use it.

These are all the contents of the article "what's the use of cdn Server?" Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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