Overseas CDN (content distribution network) and high -defense servers are two different network services. There are some obvious differences in functional, application scenarios, and working principles.

　　Overseas CDN (content distribution network):

　　Function: The main function of CDN is to increase the loading speed of user access to the website by storing the copy of static content on the server that is distributed globally. It reduces the distance between the data transmission by distributing the content to the edge node closer to the user, thereby increasing the speed of page loading.

　　Accelerate static content: CDN is mainly used to accelerate static content, such as pictures, videos, CSS, and JavaScript files. These contents are cached to the CDN server, and users can get it from the CDN node closer to them when visiting.

　　Load balancing: CDN can deploy server nodes at different geographical locations to achieve load balancing, decentralized traffic, and improve overall performance.

　　Save traffic: Because the static content is caught on the CDN node, it can reduce the traffic burden on the main server, thereby reducing the bandwidth cost.

　　High defense server:

　　Defense DDOS attack: High defense server focuses on defense of various types of DDOS (distributed rejection service) attack. They are equipped with powerful DDOS protection equipment that can detect and filter large -scale attack traffic to ensure that the server runs normally.

　　Comprehensive security protection: High -defense servers not only focus on accelerated content, but also provide comprehensive security protection, including firewalls, intrusion detection systems (IDS), etc., to protect the server from various network threats.

　　Treatment of dynamic content: High -defense servers can handle dynamic production content, such as database query, dynamic web pages, etc., not just static files.

　　Flexibility: High -defense servers usually provide more configuration options and flexibility, allowing users to customize security strategies and server configuration.

　　Summary:

　　Main functions: CDN is mainly used to accelerate static content distribution, while high -defense servers focus on defense DDOS attacks and provide comprehensive security protection.

　　Application scenario: CDN is suitable for scenes that need to accelerate static file access, and high -defense servers are suitable for scenarios that require strong DDOS protection and comprehensive security protection.

　　Content cache: CDN has improved performance through cache static content, while high -defense servers pay more attention to the processing of network security and dynamic content.

　　Network structure: CDN builds a global network through distributed edge nodes, while high -defense servers mainly provide services in data centers.

　　Considering business needs, you may choose to use CDN and high -defense servers to achieve more comprehensive performance optimization and security protection.