High -defense CDNs can usually effectively defend the mainstream DDOS (distributed refusal service) attack. High defense CDN combines the content distribution network (CDN) and high defense technology to accelerate the content transmission while providing strong defense capabilities, so that the website can better cope with various malicious attacks.

　　The following are the mainstream DDOS attack types that can defense high -defense CDN:

　　SYN/ACK FLOODS: The attacker sends a large amount of SYN or ACK packets to consume server resources and cause rejection of service. High -defense CDN can identify and filter these malicious packets.

　　UDP Floods: The attacker sends a large amount of UDP packets to occupy bandwidth and server resources. High -defense CDN can filter out these malicious traffic.

　　HTTP Floods: The attacker simulates a large number of legal HTTP requests to exhaust server resources. High -defense CDN can distinguish between normal and abnormal HTTP requests and defense.

　　DNS Amplification: The attacker uses an open DNS server to send a large number of DNS requests, causing the server to overload. High -defense CDN can filter out these malicious requests.

　　ICMP Floods: The attacker sends a large amount of ICMP packets, causing network blockage. High -defense CDN can prevent these attacks.

　　Application Layer Attacks: High -defense CDNs usually include web application firewalls (WAF), which can defend SQL injection, XSS (cross -site script attack) and other application layer attacks.

　　It should be noted that although high -defense CDN can effectively defend many DDOS attacks, but the attack technology is constantly evolving, and attackers may also use a new way to bypass defense. Therefore, when choosing high -defense CDN suppliers, it is recommended to choose a service provider with rich experience and strong technical support to ensure more comprehensive defense capabilities.