What is CDN acceleration What is the use of CDN?

CDN is believed that many friends are not unfamiliar, the Internet also often see related reports. A period of time before the major CDN service provider response to the Prime Minister call, CDN also speed down the cost, like a Web-host CDN, Aliyun CDN have a large price range. Many small white friends have such a question: What is the CDN? What is the use of it? Next, the Pepsi Net will be easy to tell everyone.

What is a CDN? CDN is the abbreviation of Content Delivery Network, that is the meaning of "contents distribution network". Generally speaking of the Cdn acceleration, generally refers to the Web site acceleration or user download resources accelerated.

The basic idea of CDN is to avoid the bottleneck and link that may affect data transmission speed and stability as far as possible, so that the content transmission is faster and more stable. By placing node servers across the network, a layer of intelligent virtual networks based on the existing Internet, the CDN system can redirect the user's request to the nearest service node according to the network traffic and the connection of each node, the load status and the user's distance and response time.

CDN's core purpose is to enable users to access the network, obtain the required content, solve the network congestion situation, significantly improve user access to the Web site response speed or user download speed.

From the above professional point of view, may be a lot of small white friends do not know what the CDN means, the following small series of easy to understand the introduction again.

CDN Simple, is accelerated, when a Web site to speed up the CDN, it gives users the feeling is to visit the speed of the site or download things faster than without the speed of acceleration, faster or download things faster.

Why is the Web site open CDN User access will be faster? Because CDN distributes the source station content to all the nodes in the whole country, shortens the user to view the object delay, enhances the user to visit the website The response speed and the website usability, solves the network bandwidth to be small, the user accesses the quantity, the dot distribution

In short, when the site opened CDN, users visit the site, not directly to the site of the original server, but a server distributed to your nearest server node, because the server close to you, so access speed or download speed will be faster.

Do you remember the previous introduction of the computer Pepsi network to set up DNS? Also mentioned in the DNS server address must fill out the nearest to your IP, which is the nearest principle, in fact, very good understanding, such as domestic visits to foreign sites why slow? The main reason is that the distance is too far, CDN's mission is to store the site content in the country and even the global CDN node, users visit the site, you can get the nearest CDN cached content, thereby enhancing access speed.

What is the use of CDN acceleration?—— benefits to visitors ' users

For the user, if a Web site opens a CDN, user access speed or download speed will be faster than not open. At present, as long as a good number of sites, will open CDN function, mainly to enhance the user experience.

--the benefits to the website

For the site or webmaster from, opened the CDN not only can enhance the speed of Web site opening, enhance the user experience. More importantly, opening a CDN can reduce the bandwidth pressure of hacker tools and servers.

After the launch of the CDN Web site, different areas of user access will be different servers, and the site's real server (source server) generally only CDN node back to access, users across the country to visit the CDN node server, does not directly access the source server, so you can introduce Web server broadband resources, Reduce server pressure.

In addition, there is a CDN node in the middle block protection, you can better protect the security of the original server. That is to say CDN for user source station server in the security cloud provides a stand-in, whether infiltration or DDoS attack, the target of the attack will be CDN node double, and then protect the site source station.