In recent years, DDOS attacks have become a major hidden danger in network security, and such attacks can be described as the number one enemy in the field of network security. So, can a CDN help prevent DDOS attacks? And how?

1. Can CDN prevent DDOS attacks?

The CDN itself has certain protection capabilities, but its ability to resist attacks is limited, so it cannot completely resist DDOS attacks. However, CDN also has a certain defensive effect. It can reduce the pressure of the attack through technologies such as caching and request redirection, and reduce the amount of information that the attacker can obtain, thereby making the attack fail.

2. How to use CDN to defend against DDoS attacks?

Using CDN technology to effectively defend against DDoS attacks, the principle is to use the CDN network to distribute user requests to multiple nodes according to certain rules. When receiving a DDoS attack, the CDN network can effectively distribute the attack traffic to multiple nodes, thereby reducing The pressure of the attack is reduced, and the influence of the attacker on the target server is avoided.

In addition, CDN can also effectively resist DDoS attacks by establishing "white list" and "black list". The white list generally refers to users who visit the website normally. The CDN network will add visitors to the white list according to their IP addresses, while the black list refers to some IP addresses that initiate attacks. The CDN network will add these IP addresses to the black list. So as to effectively defend against DDoS attacks.

Finally, the CDN network can also use traffic shaping technology to effectively defend against DDoS attacks. The CDN network will shape the attacker's request into normal traffic according to the type of traffic, thus effectively preventing the attacker from affecting the server.

3. The difference between CDN nodes and attack sources

There is an essential difference between a CDN node and an attack source. As a network node, a CDN node has better bandwidth, faster network speed, and higher stability. The source of the attack is to use the loopholes in the network structure and use many malicious nodes to launch unrestrained large-scale attacks, so that the service is interrupted or controlled by the initiator.

4. Limitations of CDN services

CDN service helps to defend against DDOS attacks to a certain extent, but the limitations of its service cannot be ignored. It cannot completely resist attacks, nor can it work immediately after the attack is launched. It can only reduce the amount of information obtained by attackers. . Therefore, when using CDN services, customers also need to conduct a comprehensive assessment of network security and establish a complete security strategy to ensure network security.

The above is the method of using CDN technology to effectively defend against DDoS attacks. CDN can effectively disperse attack traffic to multiple nodes, thereby reducing the pressure of attacks; it can also effectively resist DDoS attacks by establishing whitelists and blacklists; Traffic shaping technology can also be used to shape the attacker's request into normal traffic, thereby effectively preventing the attacker from affecting the server.