Shulou(Shulou.com)06/03 Report--

Content distribution network (Content Delivery Network, referred to as CDN) is a distributed network, which is established and covered on the bearer network, and is composed of server groups of edge nodes distributed in different areas. CDN shares the pressure on the origin server, avoids network congestion, ensures that the distribution of website content is accelerated in different regions and different scenarios, and improves the speed of resource access. Today, the editor gives you a brief introduction to the concept of CDN.

What is 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.

Key technologies of cdn:

1. Content publishing: it publishes or delivers content to the nearest remote service point (POP) by means of indexing, caching, streaming splitting, Multicast and other technologies.

2. Content routing: it is an integrated network load balancing technology, which balances users' requests on multiple remote POP through the redirect (DNS) mechanism in the content router, so that users' requests can be responded to by the nearest content source.

3. Content exchange: according to the availability of content, the availability of the server and the background of the user, it intelligently balances the load and traffic on the cache server of POP by using the technologies of application layer switching, stream splitting, redirection (ICP, WCCP), etc.

4. Performance management: through internal and external monitoring systems, it obtains the status information of network components and measures the end-to-end performance of content distribution (such as packet loss, delay, average bandwidth, startup time, frame rate, etc.). Ensure that the network is in the best running state.

If there is anything else you don't understand, you can find our CDN technical engineer on the official website. CDN technical engineer has more than ten years of experience in the industry, so it will be more detailed and professional than the editor's answer. Official website link www.yisu.com

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