What is a CDN server and what is a CDN server

What is a CDN server?The full English name of CDN server is Content Delivery Network, which translates from Chinese to Chinese means Content Delivery Network. The application CDN server accesses the network and rebuilds a new network architecture in the Internet, and opens a unique network push network to users. This can deal with the blocking problem of network access at a large level, and improve the response time and rate.

Advantages and principles of CDN serversCDN server construction is a new type of network server construction method, which is to improve the original network architecture service project, which is the actual meaning of the CDN server itself. If we take a theoretical approach, then a CDN server is a service that is related to network architecture according to quality and discipline. In fact, the CDN server is a detailed and comprehensive network system software, which contains many special program modules.

It contains four key program modules: distributed system, Layer 3 switch, network redirection and content supervision, and content supervision and network traffic management are the two more critical roles in the CDN server.

What is CDN value-added telecommunications business license?

CDN license refers to the business license issued to enterprises engaged in content distribution network business, and is the business license for enterprises to carry out value-added telecommunications services B12, service number B12It is the abbreviation of content delivery network business license, commonly known as CDN business license, CDN qualification.

How to apply for a CDN telecommunications business license.

Examination and approval departments: provincial, autonomous region and municipality communications administrations and the Ministry of Industry and Information Technology; Duration: 60 working days after acceptance;

Application conditions: 1. A company established in accordance with the law, with a registered capital of not less than 1 million in the province and no less than 10 million in cross-regional business;

2. Have the corresponding office facilities for the personnel engaged in the business;

3. There is no record of violation of telecommunication services in the last three years;

Application materials: 1) Basic materials of the enterprise:

1. Business license of enterprise legal person;

2. Legal person ID card;

3. Articles of Association;

4. Certificate of shareholders (ID card for natural persons, license and articles of association for corporate legal persons);

5. ID card of main management and technical personnel, social security certificate and labor contract;

2) Technical solution materials:

1. Business development and implementation plan;

2. Technical scheme;

3. Letter of commitment to operate in accordance with the law;

4. Business application form;

5. Company profile;

6. Network and information security assurance measures;

7. Other materials required by the Telecommunications Administration;

For other unfinished matters, you can continue to ask questions.

The full name of CDN is Content Delivery Network. The purpose is to publish content to the network closest to the user by adding a new layer of network architecture to the existing Internet"Edge", so that users can get the content they need nearby, solve the Internet network congestion, and improve the response speed of user access. Technically, it comprehensively solves the reasons such as small network bandwidth, large user access, and uneven distribution of outlets, and solves the root cause of slow response speed of user access.

Overview. A CDN (Content Delivery Network) is a network of servers that can be distributed to users around the world to deliver content to users' computers around the world more quickly. On this network, each server is a node that is responsible for storing and transmitting the data that users need.

When a user requests access to a certain **, the CDN node will call the nearest and fastest server for content distribution based on the user's geographic location and network conditions.

The role of a CDN server.

CDN servers can offload the source server and distribute web pages, audio, software, and other static or dynamic content to users faster, while also improving the speed of user access and the stability of responses. CDN servers may cache the same content multiple times in different geographic locations, further improving the user's access speed and response time.

The type of CDN server.

CDN servers are mainly divided into: edge node servers and central node servers.

Edge node servers are usually deployed in different network operators, data centers, servers in data centers, and enterprise data centers, and are at the forefront of CDN networks.

The central node server is the management center of the CDN network, which is mainly responsible for operation and maintenance, monitoring, task allocation processing, load balancing, etc., and also accommodates rich content.

Advantages of CDN servers:

CDN servers can improve the user experience, reduce the loading time of page lifting, and improve the availability and stability of the website.

On the one hand, CDN can undertake large-traffic access, relieve the pressure on the source server, and reduce its burden; On the other hand, CDN can distribute the same content across multiple nodes around the world, improving access speed and response time, thereby reducing user waiting time and traffic consumption.

Application scenarios of CDN servers.

For example, if a **** uses a CDN server, then when the user accesses the ****, the CDN node will automatically identify the user's location and select the nearest server to provide the user, so as to improve the user's speed and avoid problems such as lag and slow loading. Similarly, if an enterprise uses a CDN server, the CDN server can cache static files, which can improve access speed.

Conclusion. Overall, the CDN server is a very useful tool that can share the pressure on the source server, distribute content quickly and stably around the world, and improve the user experience by improving the access speed and response time of Yinsheng users. No matter in which field, CDN can provide enterprises with more reliable, efficient and high-quality services, and become an important part of enterprises.

The CDN server can reduce the load pressure of the origin server, reduce the load pressure of the origin server, and enhance the stability of the hall.

2. Improve user access speed: Because the CDN server is located in the closest place to the user, it can greatly shorten the network distance between the user and the server and improve the user access speed.

The full name of the CDN server is Content Delivery Network. The CDN server caches the content at the edge of the network, and then routes the user's request to the cache server closest to the user when the user accesses, thereby reducing the congestion of the network channel and the latency of access, and improving the user's access experience.

Principles of CDN

The basic principle of CDN is to set up some caching servers in regions and networks where user access is relatively concentrated. When a user accesses, the global load balancing technology is used to point the user's access to the nearest cache server, and the cache server-based rubber server responds to the user's access request instead of the origin server. In this way, on the one hand, it reduces the work pressure of the origin server, on the other hand, it enables users to obtain the required content nearby, solves the situation of Internet network congestion, and improves the response speed of user access.

The working principle of CDN is to cache the resources of the origin server to CDN nodes located all over the country, and when users request resources, they return the cached resources on the CDN nodes nearby, without the need for each user's request to go to the source site to obtain them, avoid network congestion, share the pressure of the source site, and improve the speed and experience of users accessing resources.

The data center based on Anycast technology (BGP routing) is responsible for traffic scheduling.

The scheduling system refers to the ability of CDN vendors to direct all live network requests of customer domain names to the appropriate target data center through various mechanisms, so as to achieve traffic control, quality control, cost control, and troubleshooting.

Anycast routing technology enables different servers in different regions of the world to have the same IP address, and client requests for this IP address are directed to the nearest physical server at the routing level.

The Anycast BGP route scheduling mode is the same as the DNS scheduling

The service domain name is resolved to the CDN scheduling domain name through the CNAME.

The IP address resolved by the CDN scheduling domain name is the IP address of the edge node, and the request will not be redirected to 302.

But there are also peculiarities:

The number of global IPs in the analysis results is very small, usually only 1-2, or 1 2 for a continent or a large region.

The TTL of the DNS is usually very large, often configured for 2 hours or more.