For many websites, high-defense CDN has become the best choice for most webmasters to do CC protection. Because when using the server, it is inevitable that you will encounter CC attacks, and because of the long physical distance, the user's access speed will be delayed. Under this circumstance, which company currently has a good technology for defending CC? What should we pay attention to when choosing a high-defense CDN?
CDN exists for website users to access more quickly and smoothly. At present, as website CC attacks become more frequent, CDN has evolved from the initial CDN accelerated upgrade to a high-defense CDN. The high-defense CDN is through high-defense DNS. Realized, there will be multiple high-defense nodes on a CDN network at the same time, which can effectively play the role of CC protection and affect the stable operation of the server.
So what are the main advantages of using high-defense CDN?
1. Speed up access
Through the optimization of the underlying protocol, the problem of network node fluctuations during data transmission can be effectively prevented. Through intelligent node reception, users can obtain required data at nearby nodes, which can effectively accelerate user access speed.
2. Protect the source station
CDN is a virtual network built on the basis of the existing network, which can hide the source station and protect the source station. Attacks directly reach each high-defense node instead of directly reaching the source station. It can effectively prevent the occurrence of attacks caused by the exposure of the source site, and to a certain extent, it also achieves the effect of CC protection.
3. Automated operation
The CDN is relatively intelligent in the process of use. When a single node is damaged, the user can still access normally, and the user will be directly received to other nearest nodes to visit. This automatic setting can make the entire network access Always in a relatively stable and fast state.
CDN network architecture, DNS network architecture is mainly composed of two parts: center and edge. The center refers to the CDN network management center and DNS redirection analysis center responsible for global load balancing. The equipment system is installed in the management center computer room. The edge mainly refers to the remote node, the carrier distributed by the CDN, which is mainly composed of cache and load balancer.
When a user visits a website that joins the CDN service, the domain name resolution request will eventually be handed over to the global load balancing DNS for processing. Global load balancing DNS provides users with the closest node address through a set of predefined policies, which enables users to obtain fast service without being affected by CC attacks, and has the role of CC protection. At the same time, it also maintains communication with all CDN nodes distributed around the world, collects the communication status of each node, and ensures that user requests are not distributed to unavailable CDN nodes. In fact, it performs global load balancing through DNS.
Theoretically, the simplest CDN network can use DNS responsible for global load balancing and the cache of each node. DNS supports the resolution of different IPs according to the user's source IP address to achieve close access. In order to ensure high availability, it is necessary to monitor the traffic and health status of each node.
At present, for website CC attacks, it is a better way to use high-defense CDN to protect websites against CC. High-defense CDN can not only ensure that the website can be accessed quickly, but also can effectively protect the security of the origin site and prevent Because external traffic attacks affect the stability of the server.
This article is from: https://www.zhuanqq.com/News/Industry/282.html