DDoS (Distributed Denial of Service) attack is a common network security threat that can cause the target website or server service to become unavailable. In order to deal with this threat, high-defense cloud servers have become an important tool to protect websites and servers from DDoS attacks. The following are commonly used defense technologies and measures for high-defense cloud servers:

　　1. Traffic cleaning: High-defense cloud servers are usually equipped with powerful traffic cleaning equipment, which can monitor and analyze the traffic entering the server in real time. By identifying and filtering DDoS attack traffic, normal traffic is passed to the server to ensure that the server can normally handle requests from legitimate users.

　　2. Bandwidth expansion: High-defense cloud servers have large bandwidth capabilities and can withstand greater traffic pressure. When a DDoS attack occurs, high-defense servers can share the pressure caused by the attack by increasing bandwidth and maintain service availability.

　　3. Load balancing: Through load balancing technology, high-defense cloud servers can distribute traffic to multiple servers to avoid single points of failure. This decentralized deployment method allows servers to share attack traffic when facing DDoS attacks and protect servers from overload.

　　4. Elastic expansion: The high-defense cloud server can be elastically expanded according to demand, that is, when facing DDoS attacks, server resources will be automatically increased to handle more traffic. This automated resource adjustment can help servers cope with the temporary pressure of DDoS attacks.

　　5. Advanced protection: High-defense cloud servers usually provide advanced protection functions, such as DDoS detection based on behavioral analysis, blacklist filtering, IP blocking, etc. These functions can promptly detect and block malicious traffic based on attack characteristics and patterns.

　　When choosing a high-defense cloud server, you need to consider the following factors: attack protection capabilities, bandwidth capacity, cost and performance, etc. Different service providers may have different plans and strategies, and you can choose according to your own needs and budget.

　　In summary, high-defense cloud servers can effectively defend against DDoS attacks and protect the availability and security of websites and servers through technologies and measures such as traffic cleaning, bandwidth expansion, load balancing, and elastic expansion. Choosing a reliable high-defense cloud server service provider and cooperating with it can provide reliable security protection and ensure the normal operation of the business.