Traditional web hosting stores website files on one or a few servers, serving content directly from these locations. It offers control over server configurations and suits dynamic websites but suffers from latency, scalability, and reliability issues. A CDN, in contrast, delivers static content from globally distributed edge servers, improving load speed, reliability, and traffic handling. CDNs can’t replace traditional hosting, as they don’t handle dynamic data. Small, local websites may work with just traditional hosting, while global or media-rich sites benefit from combining both. Popular hosting providers include Bluehost and SiteGround, while Cloudflare and Akamai are leading CDN services.

CDNs manage high traffic loads by using a global server network to cache and deliver content closer to users, reducing latency and origin server strain. They handle traffic through caching static content, load balancing, DDoS mitigation, and optimization techniques like compression and image formatting. Benefits include improved performance, scalability during surges, reduced bandwidth costs, and low-latency global access. Major e-commerce and streaming platforms rely on CDNs for stability during peak times. Selecting a CDN should consider coverage, performance, security, and cost. Future trends include edge computing, serverless functions, and AI-driven caching. CDNs are essential for businesses facing traffic spikes to ensure reliability and user experience.

CDN（内容分发网络）是一组分布在全球的缓存服务器网络，用于提升网站访问速度与稳定性。其通过智能调度将用户请求引导至最近节点，若缓存命中则直接返回资源，降低源站压力。此外，CDN还具备负载均衡、流量突发保护、移动网络优化及改善SEO排名等功能。广泛适用于电商平台、视频网站、游戏平台及跨境网站等高流量业务场景。主要服务商包括阿里云CDN、腾讯云CDN、Cloudflare等，选择时需关注缓存策略、HTTPS配置及安全与监控。CDN已成为现代网站运营的重要技术之一。

MB衡量数据大小，Mbps衡量传输速度。1MB等于8Megabits，2.8MB网页1秒加载需22.4Mbps带宽，并发用户越多所需带宽越大。客户常误解带宽与下载速度的关系，需通过公式计算：所需带宽（Mbps）= 单次请求数据量（MB）× 8 × 峰值并发数 ÷ 期望响应时间（秒）。云服务商以Mbps标带宽符合国际标准，便于精确计量与区分用途。通过正确理解单位选择带宽，可有效保障服务器性能。

CDN，即内容分发网络，是通过在全球范围内部署节点服务器，将网站内容缓存至边缘节点，实现快速响应用户请求的技术。其架构由源服务器、中心节点和边缘节点构成，工作流程包括DNS解析与重定向、请求边缘节点及内容缓存。CDN能显著提升访问速度，减轻源服务器压力，提高网站可用性和安全性。常用于门户网站、电商、视频和游戏网站，优化多地区用户访问体验。