Network Acceleration Technology CDN

What is Network Accelerator

The Network Accelerator is the full name of Content Delivery Network, (abbreviation: CDN), which is the content distribution network. Its principle is to release the content of the website to the cache server closest to the user, so that most customers access the cache server to obtain the required content, solve the Internet network congestion and improve the response speed of the user to visit the website. As with the provision of multiple clone sites distributed throughout the country.

The four advantages of CDN Network Accelerator

High-speed improves the access speed of enterprise sites (especially with a large number of pictures and static page sites), and greatly improves the stability of the above-mentioned sites. When the server stored in the site is down for a short time, the user can still access the cache server for a long time to obtain the information of the enterprise site; the simple CDN network accelerator is completely transparent to the user, convenient to purchase and use, and does not need to be space-consuming. Any changes will not affect the original space maintenance operation and operation content; Values ​​The company provides CDN with all re-expandable cache servers and dedicated DNS hardware and bandwidth, once purchased, can be automatically cloned for you in the telecommunications room. Make multiple copies of the site and let the site spread all over the internet. How it works

1. Each Cache Server in the above figure has a "clone version" of the CDN accelerator site that has been purchased in the Web server, so that your pages are spread all over the place, and the viewers around the site pass the most recent A Cache Server browses the website to improve the speed of the website, so that the viewer can experience the fast access effect

2. If there is a problem with one of the servers in the CDN server group, it will not affect the normal access and access of the website. Users can read data from another server to enhance the stability of the website.

2. The site administrator's ftp maintenance is still in the web server, and the Cache Server can synchronize your page changes.

3. All static images and texts will be passed between the Cache Server and the viewer. The more Cache Server, the more the website will be cloned "Clone", the company will continue to expand Cache Server The number meets the increasing demand for access.

The development trend of CDN

In just a few years, CDN technology has developed rapidly. Many websites have adopted CDN services to improve their service quality and bring users a better online experience. According to a survey by HTRC in the United States, in the United States, 8% of websites used CDN services in 1999; by 2001, this percentage had risen to 31%, and only about 14% of the sites remained in the same period. There are plans to adopt CDN services.

What benefits can this emerging technology bring to us?

1. Websites using this technology

High-speed speeds up access to corporate sites (especially with large numbers of images and static page sites) and greatly improves the stability of sites of the above nature

Practical as a corporate site When the stored server is down for a short time, the user can still access the cache server for a long time to obtain the information of the enterprise site; CDN technology use case:

For the e-commerce website, there is a so-called 8 seconds The law, that is, when a user visits a website, if the waiting time for the web page is more than 8 seconds, more than 30% of the users will give up waiting. According to the data, it is estimated that the annual e-commerce losses due to network problems (slow or even nowhere) are as high as $4.4 billion.

EBay started to use the CDN service in June 2002. The number of visits increased by 6-7 times before and after the Spring Festival, and the quality of the visit has not only decreased but has been improved. The response speed of the visit before June is 10-20. Seconds, after using CDN, it is within 8 seconds. During this period, the equipment has not increased, the service quality has been improved, the cost has been effectively controlled, and the transaction amount has also increased rapidly, which has achieved a lot of results.

China CDN Network Accelerator

The company will be officially launched on the website, and can be purchased on the website in real time. If you want to accelerate the host www.cnjl.net, then you must ensure that the DNS resolution service of cnjl.net is provided by the company's DNS. Each time you purchase a network accelerator, you can bind one URL per IP address, and more than one must be purchased separately. Does not support @Host (eg: cnjl.net)

Does the customer take effect immediately after purchase?

For the domain name registered with the company, after purchasing the CDN network accelerator from this domain name, Since the system automatically modifies the domain name, the network accelerator can be automatically enabled within 24 hours at the latest. For other registrars, you need to change the domain name DNS to your domain registrar after purchase. Our DNS can be used after it takes effect.

How do I confirm that the accelerator is in effect?

A: nslookup domain name, showing more than 1 IP will take effect

Customer website If the server is relocated for special reasons, how to modify the corresponding server IP of CDN?

A: mail to [email protected] we help you do

CDN is not only valid for "static pictures, text", if it involves a database or other aspects of the page is not There is no effect. If you can have more detailed technical information, it is better to introduce them together.

A: For dynamic scripts, database operations, etc., CacheServer in CDN does not do any processing, he is only equivalent to a transparent proxy, but it is not absolute, for example: if your database Just store the image address, the real image is stored in the server hard disk space, the program script displays the image after obtaining the address from the database. In this case, the cache server will do the image cache for you, and the speed will be faster!

The second less common case, if the binary image information is stored in the database, the program script directly obtains the image information from the database, so that it is not accelerated at all. But cdn still provides distributed access form, the increase is the stability

the cost of the accelerator

380 yuan/year/year with other cases chinakfw.bizcn.com (with cdn)- ---------- There are cdn websites kfw.bizcn.com (no cdn)---------------- There are two examples of websites without cdn, above If you have cdn, please visit these two websites separately, you will find that cdn is different.