A DDoS (Distributed Denial of Service) attack is a common cybersecurity threat designed to render a target server or network unavailable. Here are some ways to help strengthen your DDoS defenses:

　　Use DDoS defense services: Many cloud service providers and security companies offer specialized DDoS protection services. These services typically include distributed traffic scrubbing and the ability to block malicious traffic. Consider routing your web traffic to these services to filter out malicious requests.

　　Configure network devices: Configure firewalls, load balancers, and entry points to limit and control traffic to mitigate DDoS attacks. These devices can identify abnormal traffic and try to divert or block it.

　　Content Delivery Network (CDN): Using a CDN can distribute traffic and provide caching, thereby reducing the load on the server. CDN providers often have DDoS protection features that can help filter out malicious traffic.

　　Monitoring and detection: Use real-time monitoring tools to track network traffic patterns and abnormal activity. These tools can help you detect DDoS attacks early and take measures to deal with them.

　　Load balancing: Use load balancing to spread traffic and distribute requests to multiple servers. This way, even if one server is attacked, other servers can still provide services.

　　Increase bandwidth: Increasing network bandwidth can help you withstand larger-scale DDoS attacks. Consider upgrading your bandwidth to handle more traffic.

　　Contingency plan: Develop an contingency plan for DDoS attacks, clarify who is responsible for what, and how to quickly respond to attacks. This includes isolating the compromised server, notifying relevant parties and working with DDoS protection service providers.

　　Block malicious IP addresses: Monitor traffic and block malicious IP addresses. This can be accomplished through firewall rules or specialized security devices.

　　Updates and Maintenance: Keep operating systems, network devices, and applications updated to fix known vulnerabilities. Strengthen system security and close unnecessary services and ports.

　　Traffic analysis: Use traffic analysis tools to identify abnormal traffic, such as large amounts of traffic originating from a single IP address or a specific geographic location.

　　Cloud infrastructure: Consider using cloud infrastructure. Cloud providers often have strong DDoS protection capabilities that can automatically scale to respond to attacks.

　　Please note that there is no absolute DDoS defense method, so it is wise to adopt a multi-layered defense strategy. Different attacks may require different responses. The most important thing is to remain calm when an attack occurs and take immediate action to minimize the impact of the attack on your business.