What is CDN?

CDN is a content delivery network, and its full name can be Content Delivery Network or Content Distribution Network. The user's computer browsing the web accesses the web server closest to himself to read the data. In this way, the loading time of the website is accelerated and the use speed of the website is improved.

CDN的用途有哪些？

網站加速：CDN 透過全球伺服器節點分發內容，讓用戶能夠從最近的伺服器獲取資料，縮短資料傳輸的延遲，尤其在國際訪問時更能有效提升速度。
負載平衡：透過分散流量，CDN 減輕了原始伺服器的壓力，降低因高流量造成的當機風險。
安全防護：CDN 可過濾惡意請求、阻擋 DDoS 攻擊，並提供 Web 應用防火牆（WAF），為網站增添安全保障。
內容穩定性：無論是突發性的高流量事件，還是伺服器故障，CDN 都能保持服務穩定運行，避免影響用戶體驗。

CDN可以傳遞哪些內容？

CDN 的靈活性讓它能處理多種類型的內容，滿足網站和應用程式的不同需求。主要可以傳遞以下內容：

靜態內容：包括圖片、影片、CSS、JavaScript 等固定資源，這是 CDN 最常見的應用範疇。透過快取這些文件，CDN 可大幅減少伺服器的回應時間。
動態內容：雖然動態內容需根據用戶操作即時生成，但現代 CDN 可以透過智慧路由技術，提升資料傳輸效率，縮短伺服器至用戶端的距離。
串流媒體影音：如即時直播和影片點播，CDN 使用特殊協議（如 HLS 或 DASH）進行分段傳輸，確保內容穩定播放。
API 資料：支援快速且可靠的 API 請求傳遞，提升應用程式的效能與互動性。
安全驗證與加密文件：透過 CDN 的 SSL 支援，安全性資料（如證書與密碼）也能快速、安全地分發到用戶端。

CDN加速的作用原理

The operating principle of CDN is very similar to the warehouse configuration mechanism of e-commerce. In the early days of online shopping for a product, it could only be shipped from the merchant's warehouse or factory. Due to the limited geographical location, the buyer may have to wait 3 to 10 days to receive the goods. In order to shorten the delivery time, the industry established warehousing centers in various regions. , store the goods of the cooperative merchants in advance, no matter where the buyer is located, the merchant directly selects the warehouse center closest to the buyer for delivery, so the speed can be accelerated in 1~3 days to receive the goods. Similar to the warehousing mechanism, CDN also has the same principle. Through the Internet, a group of CDN servers in different regions, which are similar to the warehousing center, load data in advance to the origin server, which is like a factory, to store music, pictures, and videos. , applications, and other files, and access data faster by accessing the server closest to you.

CDN加速是如何執行的？

In the case of not using a CDN, when browsing a website, we usually enter the URL WWW... to access the Internet, the computer will first visit a server called DNS, and convert the URL into an IP address, such as 192.168.123.132. The IP location of the computer, so the computer knows which web server to access to read the website data and render the web page on the computer or smartphone in use.

In the case of using CDN, a CDN-specific resolution record will be added to the DNS server, so when we enter WWW... domain name, the computer will be directed to another dedicated CDN through the resolved IP address. The DNS server of the network, and this server will tell the computer to access another server responsible for load balancing. This server will reply to the computer according to the principle of proximity and less workload. Access the IP address of the CDN server, so the computer can find the most suitable CDN server to read the website information and present it to the user for browsing.

CDN不只是加快速度而已，也防止分散式阻斷服務(DDoS)攻擊

In addition to helping to speed up the loading of website data and improving the user experience, because each time you browse the website, you do not need to obtain data from the origin site each time, which reduces the load of the transmission bandwidth and thus reduces the bandwidth cost. Of course, since each CDN server owns some website data of the origin server, it also indirectly provides backup effect. interrupt. Under the many CDN servers, the IP address of the origin server is hidden, and the origin server is also protected from common malicious attacks, such as distributed denial of service (DDoS).

MultiCDN also uses the appropriate CDN brand

multiCDN, the previous multi- can be interpreted as the meaning of multiple compound.That is, the service technology that integrates and manages the CDNs of various brands. CDNs of different brands form their own set of Internet, and their CDN servers are located all over the world, but it is impossible for the same CDN provider to have CDN servers in all corners of the world, and their cost and performance are also different. Therefore, integrating The CDN services provided by various suppliers can draw on each other's advantages to make the CDN more comprehensive in the world.

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