What is the main purpose of CDN acceleration in foreign countries?

1. Local cache acceleration improves the access speed of enterprise sites (especially sites with a large number of ** and static pages), and greatly improves the stability of the above sites.

2. The image service eliminates the impact of the bottleneck caused by the interconnection between different operators, realizes cross-operator network acceleration, and ensures that users in different networks can get good access quality.

3. Remote Acceleration Remote access users intelligently and automatically select cache servers according to DNS load balancing technology, and select the fastest cache server to speed up remote access.

4. Bandwidth optimization: Automatically generate the remote mirror (mirror) cache server of the server, read data from the cache server when the remote user accesses, reduce the bandwidth of remote access, share network traffic, and reduce the load of the original site web server.

5. Cluster anti-attack The widely distributed CDN nodes and the intelligent redundancy mechanism between nodes can effectively prevent hacker incursions and reduce the impact of various attacks on the best of the best, while ensuring better service quality.

At present, the domestic CDN is also doing very well, there are very fast nodes in various regions of the country, and there are also high-defense nodes abroad, such as 360's. There is also a store called DIYCDN in Shenyang, which is also good, and the evaluation is quite high.

Improve access speed and prevent DDoS attacks.

Due to the differences in the network environment at home and abroad, the meaning of CDN is also different. In China, the most important problem that CDN solves is the interconnection between operators, and of course, it does solve the problems of sudden traffic, large-scale coverage, and slow access by netizens. Therefore, the most obvious demand for CDN in China is for large Internet companies, especially **, games, portals, e-commerce, etc.

Only a few foreign-funded enterprises can understand the true meaning of CDN, and it will take a long time for domestic enterprises to understand. Abroad, a significant portion of Akamai's customer base is enterprises, various enterprises that are not directly related to the Internet.

It is recommended to use rabbit CDN, and the products are accelerated CDN and anti-DDoS pro.

1. Save the bandwidth of the backbone network, reduce the bandwidth demand, provide server-side acceleration, and solve the problem of server overload caused by large user access; It can overcome the problem of uneven distribution, and can reduce its own construction and maintenance costs; Reduce the impact of "communication storms" and improve the stability of network access.

2. CDN stands for Content Delivery Network. The basic idea is to avoid the bottlenecks and links on the Internet that may affect the speed and stability of data transmission as much as possible, so as to make the content transmission faster and more stable. By placing node servers in various parts of the network to form a layer of intelligent virtual network on the basis of 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, the distance to the user, and the response time and other comprehensive information.

3. The CDN load balancing system implements the content routing function of CDN. It is used to direct the user's request to the best node in the entire CDN network. The selection of the best node can be based on a variety of strategies, such as the closest distance, the lightest node load, etc.

The load balancing system is the core of the entire CDN, and the accuracy and efficiency of the load balancing directly determine the efficiency and performance of the entire CDN.

Expand the information of the Liang Exhibition:

1. Content delivery network (CDN) is a new type of network construction method, which is specially optimized for the network coverage layer that can publish broadband richness in traditional IP networks; In a broad sense, CDN represents a network service model based on quality and order.

2. CDN is a strategically deployed overall system, including distributed storage, load balancing, network request redirection and content management, and content management and global network traffic management are the core of CDN. By judging the proximity of the user and the load on the server, the CDN ensures that the content serves the user's request in an extremely efficient manner.

CDN stands for Content Delivery Network. CDN is to add a new layer of network architecture on the basis of the existing Internet, through the deployment of edge servers, the use of load balancing.

Content distribution, scheduling and other functions enable users to access the content they need nearby, so as to solve the congestion situation and improve the response speed of user access.

CDN acceleration principle

CDN acceleration adds a mirror cache layer between the user and the origin server, directing the user's access request to the mirror cache node instead of directly accessing the origin server.

During CDN acceleration, the Global Load Balancer DNS server directs the user's access request to the cache server with the closest route, the closest location, and the lightest load based on the user's source IP address, so as to achieve the optimal matching effect.

CDN accelerates the process

The simplest CDN network consists of a DNS server and several cache servers

When the user clicks on the content URL on **, the user will request the CDN service provider that the CANAME points to by setting CANAME resolution. The CDN dedicated server returns the IP address of the CDN Global Load Balancer to the user.

The CDN's DNS server returns the CDN's Global Load Balancer IP address to the user.

The user initiates a content URL access request to the CDN's global load balancer.

Based on the IP address and URL of the request, the CDN device selects a load balancer in the region to which the user belongs and tells the user to initiate a request to the device.

The regional load balancer will provide services for the user to select a suitable cache server.

The Global Load Balancer returns the IP address of the server to the user.

The user initiates a request to the cache server, and the cache server responds to the user's request and delivers the content required by the user to the user's terminal.

If the cache server doesn't have the content the user wants, the server will have to request the content from its higher-level cache server until the origin server that traces back to ** pulls the content locally.

CDN acceleration is to accelerate access speed.

Features are help to reduce the pressure on the origin server, improve access speed, hide the origin server, etc.

Features of CDN:

1. Fast speed.

The BGP line is used as the CDN node to ensure the speed of the CDN when reading the original data.

2. The bandwidth cost is greatly reduced.

Because 70% of telecom customers access the speed itself is fast and does not need to be accelerated, this part of the traffic is completely saved. Acceleration is only for about 25% of Netcom customers.

3. Good security.

The original server of the user and the CDN acceleration node are encrypted and compressed for transmission, and the ** in the node server exists in the form of a file. Even if a node server is compromised, hackers won't be able to get any valuable data.

4. High reliability.

In the CDN acceleration system, the network interruption, attack paralysis, or system crash of any node server does not hinder the operation of the overall network and the access of the vast majority of users. The system can automatically determine and guide users to the node with the fastest access speed among the remaining nodes.

5. Easy to deploy.

You only need to modify the DNS record to the specified alias, and no other operations are required.

In short, CDN service providers deploy some node servers across the country, and if you want to use their CDN, they will cache everything you can cache to the node servers in various places. In this way, when visitors from different regions and different operators visit you, they can access it on a nearby node without going to your origin server. Thus having the effect of accelerating.

These are the most basic ways to accelerate, but there are many other ways to accelerate the effect. You can check it specifically, there are many details to be introduced.

In layman's terms, it is to achieve accelerated access speed.

Through the global load balancing system, users from all over the world can access the CDN nodes deployed in various places. Static files are cached on the node.

CDN helps reduce the pressure on the origin server, improve access speed, hide the origin server, etc.