{"id":12358602,"date":"2026-03-10T15:58:05","date_gmt":"2026-03-10T07:58:05","guid":{"rendered":"https:\/\/www.likacloud.com\/knowledge\/cdn-%e5%85%a8%e6%96%b9%e4%bd%8d%e8%a7%a3%e6%9e%90%ef%bc%9a%e4%bb%8e%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86%e5%88%b0%e9%80%89%e5%9e%8b%e6%8c%87%e5%8d%97%ef%bc%8c%e6%8f%90%e5%8d%87%e4%bd%a0%e7%9a%84\/"},"modified":"2026-03-11T12:56:59","modified_gmt":"2026-03-11T04:56:59","slug":"cdn-comprehensive-guide-how-it-works-and-choosing-the-right-one-to-boost-website-speed","status":"publish","type":"knowledge_post","link":"https:\/\/www.likacloud.com\/en\/knowledge\/cdn\/cdn-comprehensive-guide-how-it-works-and-choosing-the-right-one-to-boost-website-speed\/","title":{"rendered":"CDN: From How It Works to Selection Guides to Improve Your Site's Loading Speed"},"content":{"rendered":"

In today's internet era, where user experience is of paramount importance, the speed of websites and applications is one of the key factors determining user retention and the success or failure of a business. Content Delivery Networks (CDNs) have emerged as an essential solution for accelerating and stabilizing modern network infrastructure. Their core value lies in the efficient and secure distribution of content from the origin server to users around the world, addressing a range of issues such as network congestion, slow access across different operators, and high server loads.<\/p>\n\n\n\n

The basic composition and working principle of ## CDN
\nCDN is not a single technology, but rather an intelligent network composed of distributed nodes. Its efficient operation relies on the coordinated work of multiple core components.<\/p>\n\n\n\n

\u6838\u5fc3\u7ec4\u4ef6\uff1a\u8282\u70b9\u4e0e\u7f13\u5b58<\/h3>\n\n\n\n

A CDN (Content Delivery Network) consists of cache nodes (also known as edge nodes) distributed around the world, as well as a small number of central nodes. These nodes are typically located within the data centers of major internet service providers (ISPs) and have ample bandwidth resources. When a user requests a resource (such as an image, CSS file, JavaScript file, or video), the request is first directed to the edge node that is geographically closest to the user or has the best network connection. If the resource is already cached on that edge node, it is returned directly to the user; this is referred to as a \u201ccache hit.\u201d If the resource is not cached, the edge node will retrieve it from a higher-level node or directly from the origin server, cache it, and then provide it to the user.<\/p>\n

Recommended Reading In-depth analysis of CDN: accelerate the core technology principles and practice guidelines for website content delivery<\/a>\u3002<\/p>\n\n\n\n\n

Key Technologies: Intelligent DNS Resolution and Load Balancing<\/h3>\n\n\n\n

The intelligence of CDN is first reflected in the management of traffic, which primarily relies on an intelligent DNS system. When a user makes a request, the local DNS resolves the domain name and sends the request to the CDN provider\u2019s authoritative DNS server. This server does not simply return a fixed IP address; instead, it uses a complex set of algorithms (taking into account factors such as the user\u2019s IP address, the health status of the nodes, the load on the nodes, and network performance) to make real-time calculations and determine the most appropriate edge node to serve the request. This process is often closely integrated with load balancing technology to ensure that traffic is distributed evenly and reasonably across all nodes, preventing any single node from becoming overloaded.<\/p>\n\n

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\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"bunny.net\r\n\t\t\t\t\t\t\t\t\t\r\n\t\t\t<\/div>\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t
\r\n\t\t\t\t
\r\n\t\t\t\t\tbunny.net CDN<\/strong>\r\n\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t\t\t\tMonthly payments start at just $1, with clear, no-hidden fees. Features include permanent caching, real-time monitoring, DDoS protection and free SSL certificates, especially optimized for video streaming, and a flexible per-use billing model.<\/span>\r\n\t\t\t\t
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No credit card required, free 14-day trial<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\tAccess to bunny.net CDN \u2192<\/a>\r\n\t\t\t\t\t\t\t<\/div> \r\n\t\t<\/div>\r\n\t<\/div>\r\n\t\t\r\n\t\r\n\t
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\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Cloudflare\r\n\t\t\t\t\t\t\t\t\t\r\n\t\t\t<\/div>\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t
\r\n\t\t\t\t
\r\n\t\t\t\t\tCloudflare Enterprise on Cloudways<\/strong>\r\n\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t\t\t\tCloudflare's Enterprise CDN\/WAF pricing plan is 4.99 USD\/month per domain for up to 5 domains, including 100GB of traffic, and 0.02 USD\/GB for anything beyond that.<\/span>\r\n\t\t\t\t
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100GB of free traffic per domain<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\tAccess to Cloudways Cloudflare Enterprise \u2192<\/a>\r\n\t\t\t\t\t\t\t<\/div> \r\n\t\t<\/div>\r\n\t<\/div>\r\n\t\t\r\n<\/div>\r\n\r\n\r\n\n\n\n\n\n\n\n

Content Synchronization Mechanism<\/h3>\n\n\n\n

To ensure that users can access the latest content, a CDN (Content Delivery Network) must have an efficient and reliable mechanism for content synchronization. The most common methods are \u201cpassive caching\u201d (where the cache expires and the content is fetched from the origin server) and \u201cactive preloading.\u201d Passive caching relies on cache control headers (such as `Cache-Control` and `Expires`) to determine the validity period of resources; active preloading, on the other hand, allows the user or the origin server to proactively push important resources to all or specified edge nodes, ensuring that the content is ready in advance of a high volume of concurrent requests. Additionally, a cache refresh function enables the origin server to immediately remove the outdated cache from the CDN after updating the content.<\/p>\n\n\n\n

The core advantages of using CDN for ##
\n\u7f51\u7ad9\u548c\u5e94\u7528\u96c6\u6210 CDN \u540e\uff0c\u80fd\u83b7\u5f97\u7acb\u7aff\u89c1\u5f71\u4e14\u591a\u5143\u5316\u7684\u6536\u76ca\uff0c\u8fd9\u4e9b\u4f18\u52bf\u662f\u5176\u5728\u5168\u7403\u8303\u56f4\u5185\u88ab\u5e7f\u6cdb\u91c7\u7528\u7684\u6839\u672c\u539f\u56e0\u3002<\/p>\n\n\n\n

\u5927\u5e45\u63d0\u5347\u7ec8\u7aef\u7528\u6237\u8bbf\u95ee\u901f\u5ea6<\/h3>\n\n\n\n

\u8fd9\u662f CDN \u6700\u76f4\u63a5\u3001\u6700\u663e\u8457\u7684\u4f18\u52bf\u3002\u901a\u8fc7\u5c06\u5185\u5bb9\u7f13\u5b58\u81f3\u8ddd\u79bb\u7528\u6237\u4ec5\u201c\u4e00\u8df3\u201d\u4e4b\u9065\u7684\u8fb9\u7f18\u8282\u70b9\uff0c\u6781\u5927\u5730\u51cf\u5c11\u4e86\u7f51\u7edc\u5ef6\u8fdf\u548c\u6570\u636e\u5305\u4f20\u8f93\u8ddd\u79bb\u3002\u65e0\u8bba\u7528\u6237\u8eab\u5904\u4f55\u5730\uff0c\u90fd\u53ef\u4ee5\u5feb\u901f\u52a0\u8f7d\u7f51\u9875\u5185\u5bb9\uff0c\u89c2\u770b\u6d41\u7545\u7684\u89c6\u9891\uff0c\u4ece\u800c\u663e\u8457\u63d0\u5347\u7528\u6237\u6ee1\u610f\u5ea6\u548c\u53c2\u4e0e\u5ea6\u3002\u5bf9\u4e8e\u7535\u5546\u3001\u5a92\u4f53\u3001\u5728\u7ebf\u6559\u80b2\u7b49\u884c\u4e1a\uff0c\u9875\u9762\u52a0\u8f7d\u65f6\u95f4\u6bcf\u51cf\u5c11\u4e00\u79d2\uff0c\u90fd\u53ef\u80fd\u5e26\u6765\u53ef\u89c2\u7684\u8f6c\u5316\u7387\u63d0\u5347\u3002<\/p>\n\n\n\n

Effectively reduces the load on the origin server and ensures stability.<\/h3>\n\n\n\n

In the absence of a CDN (Content Delivery Network), all user requests are directed directly to the origin server, placing a significant burden on its bandwidth, CPU resources, and I\/O performance. This can easily lead to server overload or even downtime due to sudden spikes in traffic. A CDN can intercept and handle the vast majority of static resource requests (which typically account for more than 70\u201380% of the total page traffic), with only requests for dynamic content or those that need to retrieve data from the origin server being sent there. Essentially, a CDN acts as a buffer, allowing the origin server to focus on processing the core business logic and enhancing the website\u2019s ability to handle traffic surges and malicious attacks.<\/p>\n

Recommended Reading In-depth Explanation of CDN Technology: From Principles to Practice \u2013 Improving Website Performance and User Experience<\/a>\u3002<\/p>\n\n\n\n\n

Enhance security protection capabilities.<\/h3>\n\n\n\n

\u73b0\u4ee3 CDN \u670d\u52a1\u5df2\u4e0d\u4ec5\u662f\u52a0\u901f\u5de5\u5177\uff0c\u66f4\u662f\u5b89\u5168\u9632\u62a4\u7684\u91cd\u8981\u4e00\u73af\u3002\u8bb8\u591a CDN \u63d0\u4f9b\u5546\u96c6\u6210\u4e86 Web \u5e94\u7528\u9632\u706b\u5899\uff08WAF\uff09\u3001\u5206\u5e03\u5f0f\u62d2\u7edd\u670d\u52a1\uff08DDoS\uff09\u653b\u51fb\u9632\u62a4\u7b49\u529f\u80fd\u3002\u901a\u8fc7\u904d\u5e03\u5168\u7403\u7684\u8fb9\u7f18\u8282\u70b9\uff0cCDN \u53ef\u4ee5\u8bc6\u522b\u5e76\u62e6\u622a\u6076\u610f\u6d41\u91cf\uff08\u5982\u722c\u866b\u3001\u6ce8\u5165\u653b\u51fb\u3001CC\u653b\u51fb\uff09\uff0c\u5728\u4e0d\u5f71\u54cd\u6b63\u5e38\u7528\u6237\u8bbf\u95ee\u7684\u60c5\u51b5\u4e0b\uff0c\u5c06\u8fd9\u4e9b\u5a01\u80c1\u963b\u6321\u5728\u8fb9\u7f18\uff0c\u4ece\u800c\u4fdd\u62a4\u6e90\u7ad9\u670d\u52a1\u5668\u7684\u5b89\u5168\u3002<\/p>\n\n\n\n

Reduced bandwidth costs<\/h3>\n\n\n\n

\u5bf9\u4e8e\u6d41\u91cf\u5de8\u5927\u7684\u7f51\u7ad9\uff0c\u6e90\u7ad9\u5e26\u5bbd\u662f\u4e00\u7b14\u4e0d\u5c0f\u7684\u5f00\u652f\u3002\u901a\u8fc7\u4f7f\u7528 CDN\uff0c\u7531\u4e8e\u5927\u90e8\u5206\u6d41\u91cf\u7531\u8fb9\u7f18\u8282\u70b9\u76f4\u63a5\u63d0\u4f9b\uff0c\u6e90\u7ad9\u7684\u51fa\u53e3\u5e26\u5bbd\u538b\u529b\u9aa4\u51cf\u3002\u867d\u7136\u4f7f\u7528 CDN \u672c\u8eab\u9700\u8981\u652f\u4ed8\u8d39\u7528\uff0c\u4f46\u5176\u901a\u5e38\u91c7\u7528\u9636\u68af\u8ba1\u8d39\u6a21\u5f0f\uff08\u4f7f\u7528\u91cf\u8d8a\u5927\u5355\u4ef7\u8d8a\u4f4e\uff09\uff0c\u7efc\u5408\u8ba1\u7b97\u4e0b\u6765\uff0c\u6574\u4f53\u5e26\u5bbd\u6210\u672c\u5f80\u5f80\u80fd\u5f97\u5230\u6709\u6548\u63a7\u5236\uff0c\u5b9e\u73b0\u4e86\u6027\u80fd\u4e0e\u6210\u672c\u7684\u53cc\u8d62\u3002<\/p>\n

Recommended Reading The Principles of CDN Technology: From Beginner to Expert\u2014Core Strategies for Building High-Performance Websites<\/a>\u3002<\/p>\n\n\n\n\n

How to Choose and Evaluate a CDN Service Provider for ##
\n\u9762\u5bf9\u5e02\u573a\u4e0a\u4f17\u591a\u7684 CDN \u670d\u52a1\u5546\uff0c\u5982\u4f55\u505a\u51fa\u660e\u667a\u7684\u9009\u62e9\u81f3\u5173\u91cd\u8981\u3002\u8bc4\u4f30\u8fc7\u7a0b\u9700\u8981\u4ece\u591a\u4e2a\u7ef4\u5ea6\u8fdb\u884c\u7efc\u5408\u8003\u91cf\uff0c\u5339\u914d\u81ea\u8eab\u7684\u6838\u5fc3\u4e1a\u52a1\u9700\u6c42\u3002<\/p>\n\n\n\n

\u8282\u70b9\u8986\u76d6\u8303\u56f4\u4e0e\u6027\u80fd\u8868\u73b0<\/h3>\n\n\n\n

\u9996\u5148\u5e94\u5173\u6ce8 CDN \u63d0\u4f9b\u5546\u7684\u8282\u70b9\u6570\u91cf\u3001\u5730\u7406\u4f4d\u7f6e\u5206\u5e03\u4ee5\u53ca\u5176\u5408\u4f5c\u7684\u8fd0\u8425\u5546\u7f51\u7edc\uff08\u5982\u7535\u4fe1\u3001\u8054\u901a\u3001\u79fb\u52a8\u7b49\uff09\u3002\u8282\u70b9\u8986\u76d6\u8d8a\u5e7f\u6cdb\u3001\u8d8a\u6df1\u5165\uff0c\u8d8a\u80fd\u4e3a\u4e0d\u540c\u5730\u533a\u7684\u7528\u6237\u63d0\u4f9b\u4f18\u8d28\u8bbf\u95ee\u4f53\u9a8c\u3002\u53ef\u4ee5\u901a\u8fc7\u7b2c\u4e09\u65b9\u6d4b\u901f\u5e73\u53f0\uff08\u5982\u89c2\u5bdf\u6d4b\u901f\u3001\u535a\u777f\u7b49\uff09\u6216\u81ea\u884c\u53d1\u8d77\u771f\u5b9e\u7528\u6237\u76d1\u63a7\uff08RUM\uff09\u6765\u8bc4\u4f30\u5404\u5382\u5546\u5728\u4e0d\u540c\u5730\u57df\u3001\u4e0d\u540c\u8fd0\u8425\u5546\u4e0b\u7684\u6027\u80fd\u8868\u73b0\uff0c\u5982\u9996\u5b57\u8282\u65f6\u95f4\u3001\u5b8c\u5168\u52a0\u8f7d\u65f6\u95f4\u3001\u53ef\u7528\u6027\u7b49\u5173\u952e\u6307\u6807\u3002<\/p>\n\n\n\n

Functional Features and Usability<\/h3>\n\n\n\n

\u9664\u4e86\u57fa\u7840\u7684\u7f13\u5b58\u52a0\u901f\uff0c\u8fd8\u9700\u786e\u8ba4 CDN \u662f\u5426\u63d0\u4f9b\u60a8\u6240\u9700\u7684\u9ad8\u7ea7\u529f\u80fd\u3002\u4f8b\u5982\uff0c\u82e5\u4e1a\u52a1\u6d89\u53ca\u6d77\u91cf\u89c6\u9891\u6d41\u5a92\u4f53\uff0c\u5219\u9700\u8981\u5f3a\u529b\u7684\u89c6\u9891\u70b9\u64ad\/\u76f4\u64ad\u52a0\u901f\u3001\u5207\u7247\u4e0e\u8f6c\u7801\u670d\u52a1\uff1b\u82e5\u4e1a\u52a1\u5168\u7403\u5316\uff0c\u5219\u9700\u5173\u6ce8\u5bf9 HTTP\/3\uff08QUIC\uff09\u3001IPv6\u3001TLS \u6700\u65b0\u7248\u672c\u7684\u652f\u6301\u3002\u540c\u65f6\uff0c\u63a7\u5236\u53f0\u7684\u7ba1\u7406\u662f\u5426\u4fbf\u6377\u3001\u914d\u7f6e\u662f\u5426\u7075\u6d3b\u3001API \u662f\u5426\u5b8c\u5584\u3001\u65e5\u5fd7\u4e0e\u7edf\u8ba1\u62a5\u8868\u662f\u5426\u6e05\u6670\u8be6\u5c3d\uff0c\u90fd\u76f4\u63a5\u5173\u7cfb\u5230\u65e5\u5e38\u8fd0\u7ef4\u7684\u6548\u7387\u3002<\/p>\n\n\n\n

\u5b89\u5168\u4e0e\u53ef\u9760\u6027\u4fdd\u969c<\/h3>\n\n\n\n

\u5b89\u5168\u529f\u80fd\u5728\u5f53\u524d\u73af\u5883\u4e0b\u5fc5\u4e0d\u53ef\u5c11\u3002\u9700\u8be6\u7ec6\u4e86\u89e3 CDN \u670d\u52a1\u5546\u5728 DDoS \u9632\u62a4\u3001WAF \u89c4\u5219\u5e93\u3001HTTPS \u652f\u6301\uff08\u662f\u5426\u514d\u8d39\u63d0\u4f9b SSL \u8bc1\u4e66\uff09\u3001\u8bbf\u95ee\u63a7\u5236\uff08\u5982 referer \u9632\u76d7\u94fe\u3001IP \u9ed1\u767d\u540d\u5355\u3001\u65f6\u95f4\u6233\u9632\u76d7\u94fe\uff09\u7b49\u65b9\u9762\u7684\u80fd\u529b\u3002\u540c\u65f6\uff0c\u670d\u52a1\u7b49\u7ea7\u534f\u8bae\uff08SLA\uff09\u662f\u8861\u91cf\u53ef\u9760\u6027\u7684\u91cd\u8981\u6307\u6807\uff0c\u5b83\u660e\u786e\u4e86\u670d\u52a1\u5546\u627f\u8bfa\u7684\u53ef\u7528\u6027\u767e\u5206\u6bd4\uff08\u5982 99.9% \u6216 99.99%\uff09\u53ca\u8d54\u507f\u65b9\u6848\uff0c\u662f\u4e1a\u52a1\u8fde\u7eed\u6027\u7684\u91cd\u8981\u4fdd\u969c\u3002<\/p>\n\n\n\n

Cost structure and technical support<\/h3>\n\n\n\n

\u6e05\u6670\u7406\u89e3 CDN \u7684\u8ba1\u8d39\u6a21\u5f0f\u662f\u6210\u672c\u63a7\u5236\u7684\u57fa\u7840\u3002\u5e38\u89c1\u7684\u8ba1\u8d39\u65b9\u5f0f\u5305\u62ec\u6309\u5e26\u5bbd\u5cf0\u503c\u8ba1\u8d39\u3001\u6309\u6d41\u91cf\u8ba1\u8d39\u6216\u6309\u8bf7\u6c42\u6b21\u6570\u8ba1\u8d39\u3002\u9700\u8981\u6839\u636e\u81ea\u8eab\u4e1a\u52a1\u66f2\u7ebf\u7684\u7279\u70b9\uff08\u5982\u662f\u5426\u5e38\u6709\u7a81\u53d1\u9ad8\u5cf0\uff09\u9009\u62e9\u6700\u9002\u5408\u7684\u6a21\u5f0f\u3002\u6b64\u5916\uff0c\u6280\u672f\u652f\u6301\u56e2\u961f\u7684\u4e13\u4e1a\u6c34\u5e73\u548c\u54cd\u5e94\u901f\u5ea6\u540c\u6837\u5173\u952e\uff0c\u5c24\u5176\u662f\u5728\u51fa\u73b0\u6545\u969c\u6216\u9700\u8981\u7d27\u6025\u54a8\u8be2\u65f6\uff0c\u80fd\u5426\u5f97\u5230\u53ca\u65f6\u3001\u6709\u6548\u7684\u5e2e\u52a9\u5c06\u76f4\u63a5\u5f71\u54cd\u95ee\u9898\u89e3\u51b3\u7684\u901f\u5ea6\u3002<\/p>\n\n\n\n

Best Practices for Configuring and Optimizing ## CDN
\n\u6210\u529f\u63a5\u5165 CDN \u53ea\u662f\u7b2c\u4e00\u6b65\uff0c\u5408\u7406\u7684\u914d\u7f6e\u4e0e\u6301\u7eed\u7684\u4f18\u5316\u624d\u80fd\u91ca\u653e\u5176\u6700\u5927\u6f5c\u80fd\u3002\u4ee5\u4e0b\u662f\u51e0\u4e2a\u5173\u952e\u9886\u57df\u7684\u5b9e\u8df5\u6307\u5357\u3002<\/p>\n\n\n\n

Fine-grained configuration of caching strategies<\/h3>\n\n\n\n

\u826f\u597d\u7684\u7f13\u5b58\u7b56\u7565\u662f CDN \u6548\u80fd\u7684\u6838\u5fc3\u3002\u5e94\u6839\u636e\u8d44\u6e90\u7684\u53d8\u66f4\u9891\u7387\u8fdb\u884c\u5206\u7c7b\u7ba1\u7406\uff1a\u5bf9\u4e8e\u957f\u671f\u4e0d\u53d8\u7684\u9759\u6001\u8d44\u6e90\uff08\u5982\u7248\u672c\u5316\u7684 JS\/CSS\u3001LOGO \u56fe\u7247\uff09\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u8f83\u957f\u7684\u8fc7\u671f\u65f6\u95f4\uff08\u5982\u4e00\u5e74\uff09\uff1b\u5bf9\u4e8e\u53ef\u80fd\u5076\u5c14\u66f4\u65b0\u7684\u8d44\u6e90\uff0c\u53ef\u8bbe\u7f6e\u4e2d\u7b49\u957f\u5ea6\u7f13\u5b58\u5e76\u7ed3\u5408\u7f13\u5b58\u952e\uff08Cache Key\uff09\u5ffd\u7565\u67e5\u8be2\u5b57\u7b26\u4e32\uff1b\u5bf9\u4e8e\u5b8c\u5168\u52a8\u6001\u7684\u5185\u5bb9\uff0c\u5219\u5e94\u8bbe\u7f6e\u4e0d\u7f13\u5b58\u6216\u6781\u77ed\u65f6\u95f4\u7f13\u5b58\u3002\u5229\u7528 `Cache-Control` \u548c CDN \u63a7\u5236\u53f0\u7684\u7f13\u5b58\u89c4\u5219\u529f\u80fd\u8fdb\u884c\u7cbe\u7ec6\u63a7\u5236\u81f3\u5173\u91cd\u8981\u3002<\/p>\n\n\n\n

Utilizing merging and compression techniques<\/h3>\n\n\n\n

\u5728\u901a\u8fc7 CDN \u5206\u53d1\u524d\uff0c\u5bf9\u524d\u7aef\u8d44\u6e90\u8fdb\u884c\u4f18\u5316\u80fd\u8fdb\u4e00\u6b65\u63d0\u5347\u6027\u80fd\u3002\u8fd9\u5305\u62ec\u5c06\u591a\u4e2a\u5c0f\u578b\u7684 CSS \u6216 JavaScript \u6587\u4ef6\u5408\u5e76\u4ee5\u51cf\u5c11 HTTP \u8bf7\u6c42\u6b21\u6570\uff1b\u4f7f\u7528 Gzip \u6216 Brotli \u7b49\u7b97\u6cd5\u5bf9\u6587\u672c\u8d44\u6e90\uff08HTML, CSS, JS\uff09\u8fdb\u884c\u538b\u7f29\uff0c\u663e\u8457\u51cf\u5c11\u4f20\u8f93\u4f53\u79ef\uff1b\u5bf9\u56fe\u7247\u8fdb\u884c\u9002\u5f53\u7684\u538b\u7f29\u548c\u683c\u5f0f\u8f6c\u6362\uff08\u5982\u4f7f\u7528 WebP\uff09\uff0c\u5728\u4e0d\u660e\u663e\u635f\u5931\u753b\u8d28\u7684\u524d\u63d0\u4e0b\u5927\u5e45\u7f29\u5c0f\u6587\u4ef6\u5c3a\u5bf8\u3002<\/p>\n\n\n\n

Enable HTTPS and optimize TLS performance.<\/h3>\n\n\n\n

For security and SEO reasons, enabling HTTPS for the entire website has become the standard practice. CDN (Content Delivery Network) typically provides a one-stop solution for HTTPS, including free SSL certificates and automated management. At the optimization level, HTTP\/2 or HTTP\/3 can be enabled to support multiplexing and reduce connection overhead; TLS configurations can also be optimized by using more secure encryption suites and enabling session resumption to decrease handshake latency.<\/p>\n\n\n\n

\u5b9e\u65bd\u667a\u80fd\u9884\u70ed\u4e0e\u5237\u65b0<\/h3>\n\n\n\n

Proactively manage the cache in line with the business schedule. Before planned marketing campaigns (such as new product launches or major promotions) or content updates, use the preheating feature to distribute key resources to edge nodes in advance, preventing a surge in traffic from the origin server when the campaigns begin. After the content is updated, promptly use the refresh (cache clearing) function to ensure that users can access the latest content immediately. You can also use directory refreshes or URL refreshes for more targeted operations.<\/p>\n\n\n\n

## Summary
\nCDN has evolved from an optional, advanced service to a fundamental technology that enables modern internet applications to operate with high speed, stability, and security. By utilizing a distributed architecture, intelligent scheduling, and edge caching, CDN establishes an efficient content distribution mechanism between users and the origin servers, effectively addressing performance issues caused by distance and network bottlenecks. Understanding its working principles is essential for making the most of its capabilities. Scientific selection, careful configuration, and ongoing optimization are key to maximizing its value. Whether you are a small website owner or a large enterprise, properly deploying and optimizing CDN is an effective way to enhance the competitiveness of your digital business.<\/p>\n\n\n\n

## FAQ Frequently Asked Questions
\nCan ### CDN accelerate the content of dynamic websites?<\/p>\n\n\n\n

Traditionally, CDN (Content Delivery Networks) are primarily used to accelerate static content. However, for dynamic content, modern CDN solutions can also improve performance through advanced routing techniques (such as intelligent route selection and TCP optimization) as well as edge computing technologies. By selecting the most optimal network path to retrieve content from the origin server, the number of routing hops and network congestion can be reduced, thereby lowering the latency of dynamic requests. Some advanced CDN systems even support the execution of certain processing tasks at the edge nodes, further accelerating the delivery of dynamic content.<\/p>\n\n\n\n

After using a CDN (Content Delivery Network), will the visitor IP addresses in the website logs become the IP addresses of the CDN nodes?<\/h3>\n\n\n\n

\u662f\u7684\uff0c\u6e90\u7ad9\u670d\u52a1\u5668\u65e5\u5fd7\u4e2d\u8bb0\u5f55\u7684\u8bbf\u95ee\u8005 IP \u5730\u5740\u901a\u5e38\u4f1a\u663e\u793a\u4e3a CDN \u8fb9\u7f18\u8282\u70b9\u7684 IP\u3002\u8fd9\u4f1a\u7ed9\u9700\u8981\u5206\u6790\u771f\u5b9e\u7528\u6237\u5730\u7406\u4f4d\u7f6e\u6216\u8fdb\u884c IP \u5206\u6790\u7684\u4e1a\u52a1\u5e26\u6765\u56f0\u6270\u3002\u89e3\u51b3\u65b9\u6cd5\u662f\uff0c\u7edd\u5927\u591a\u6570 CDN \u670d\u52a1\u5546\u90fd\u652f\u6301\u5728\u56de\u6e90\u8bf7\u6c42\u7684 HTTP \u5934\u90e8\u4e2d\u643a\u5e26\u771f\u5b9e\u7528\u6237 IP\uff08\u901a\u5e38\u901a\u8fc7 `X-Forwarded-For` \u6216 `X-Real-IP` \u7b49\u5934\u90e8\u5b57\u6bb5\uff09\uff0c\u6e90\u7ad9\u7a0b\u5e8f\u9700\u8981\u914d\u7f6e\u4e3a\u4f18\u5148\u4ece\u8fd9\u4e9b\u5934\u90e8\u4e2d\u8bfb\u53d6\u5e76\u8bb0\u5f55\u7528\u6237\u771f\u5b9e IP \u5730\u5740\u3002<\/p>\n\n\n\n

What could be the reasons why the CDN cache does not get updated, or does not take effect after being refreshed?<\/h3>\n\n\n\n

\u8fd9\u662f\u4e00\u4e2a\u5e38\u89c1\u95ee\u9898\uff0c\u539f\u56e0\u53ef\u80fd\u662f\u591a\u65b9\u9762\u7684\u3002\u9996\u5148\uff0c\u68c0\u67e5 CDN \u914d\u7f6e\u7684\u7f13\u5b58\u8fc7\u671f\u65f6\u95f4\u662f\u5426\u8fc7\u957f\uff0c\u5bfc\u81f4\u5728\u5237\u65b0\u540e\uff0c\u8282\u70b9\u4ecd\u4f9d\u8d56\u672c\u5730\u672a\u8fc7\u671f\u7684\u7f13\u5b58\u3002\u5176\u6b21\uff0c\u786e\u8ba4\u5237\u65b0\u7684\u64cd\u4f5c\u662f\u5426\u6b63\u786e\uff08\u5982\u5237\u65b0\u5b8c\u6574\u7684 URL\uff0c\u5305\u62ec\u534f\u8bae\u5934\uff09\u3002\u518d\u6b21\uff0c\u6d4f\u89c8\u5668\u672c\u5730\u7f13\u5b58\u4e5f\u662f\u4e00\u4e2a\u5e72\u6270\u56e0\u7d20\uff0c\u9700\u8981\u5728\u6d4b\u8bd5\u65f6\u5f3a\u5236\u6e05\u9664\u6d4f\u89c8\u5668\u7f13\u5b58\u6216\u5f00\u542f\u65e0\u75d5\u6a21\u5f0f\u3002\u6700\u540e\uff0cCDN \u7684\u5237\u65b0\u64cd\u4f5c\u5e76\u975e\u77ac\u65f6\u5168\u7403\u751f\u6548\uff0c\u5b58\u5728\u4e00\u5b9a\u7684\u4f20\u64ad\u5ef6\u8fdf\uff0c\u901a\u5e38\u5728\u51e0\u5206\u949f\u5185\u5b8c\u6210\uff0c\u4f46\u53d6\u51b3\u4e8e CDN \u5382\u5546\u7684\u8282\u70b9\u540c\u6b65\u673a\u5236\u3002<\/p>\n\n\n\n

Can a website use multiple CDN (Content Delivery Network) providers at the same time?<\/h3>\n\n\n\n

Yes, this solution is called \u201cmulti-CDN\u201d or \u201chybrid CDN\u201d. There are usually two implementation methods: one is to use different CDNs in different regions or for different business modules (such as using one in China and another abroad); the other is to use intelligent DNS or third-party multi-CDN management platforms to dynamically route user traffic to the optimal CDN network based on real-time monitored performance data. This approach can enhance redundancy and overall availability, avoid business interruptions caused by a single vendor's failure, and combine the advantages of various providers. However, the complexity and cost of deployment and management will also increase accordingly.<\/p>","protected":false},"excerpt":{"rendered":"

This article provides a systematic analysis of the composition and working principles of CDN (Content Delivery Network), including key technologies such as intelligent DNS, caching, and load balancing. It details the core advantages of CDN in improving access speed, reducing the load on the origin server, enhancing security, and lowering costs. Additionally, it offers a selection guide for evaluating CDN solutions based on factors such as node coverage and functional features.<\/p>","protected":false},"author":7,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tags":[385,359,361,285,360],"knowledge_category":[278],"class_list":["post-12358602","knowledge_post","type-knowledge_post","status-publish","hentry","tag-cdn-acceleration","tag-content-delivery-network","tag-cache-strategy","tag-website-performance-optimization","tag-edge-computing","knowledge_category-cdn"],"acf":{"site_seo_keywords":"CDN,\u5185\u5bb9\u5206\u53d1\u7f51\u7edc,\u7f51\u7ad9\u52a0\u901f,CDN\u5de5\u4f5c\u539f\u7406,CDN\u9009\u578b\u6307\u5357,\u63d0\u5347\u52a0\u8f7d\u901f\u5ea6,CDN\u6838\u5fc3\u4f18\u52bf,CDN\u670d\u52a1\u5546\u8bc4\u4f30"},"_links":{"self":[{"href":"https:\/\/www.likacloud.com\/en\/wp-json\/wp\/v2\/knowledge_posts\/12358602","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.likacloud.com\/en\/wp-json\/wp\/v2\/knowledge_posts"}],"about":[{"href":"https:\/\/www.likacloud.com\/en\/wp-json\/wp\/v2\/types\/knowledge_post"}],"author":[{"embeddable":true,"href":"https:\/\/www.likacloud.com\/en\/wp-json\/wp\/v2\/users\/7"}],"version-history":[{"count":0,"href":"https:\/\/www.likacloud.com\/en\/wp-json\/wp\/v2\/knowledge_posts\/12358602\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.likacloud.com\/en\/wp-json\/wp\/v2\/media?parent=12358602"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.likacloud.com\/en\/wp-json\/wp\/v2\/tags?post=12358602"},{"taxonomy":"knowledge_category","embeddable":true,"href":"https:\/\/www.likacloud.com\/en\/wp-json\/wp\/v2\/knowledge_category?post=12358602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}