FAQ

This topic describes issues about security and caching in Alibaba Cloud Content Delivery Network (CDN) and their solutions.

• Security
  • Why can an IP address in the IP blacklist still be used to request resources?
  • How do I handle DDoS or HTTP flood attacks against a CDN domain?
  • How can I use CDN to block a specified IP address?
• Caching
  • What are the causes of a decreased cache hit rate on a CDN node?
  • How are CDN cache nodes divided?
  • How do I handle an error message "Preload queue is full, please try again later"?