CDN nodes are typically deployed in multiple locations, often via multiple backbone networks. The number of nodes and servers that make up a CDN varies by architecture, with some reaching thousands of nodes, tens of thousands of servers on many remote points of presence (PoPs), and others building global networks with a handful of Geographical PoPs. A CDN is built on a network of interconnected servers that are strategically placed together to minimize the distance between the user and the nearest server. These servers cache copies of web content.
When a user requests a web page, dynamic request routing ensures it reaches the closest available CDN server. If the CDN server has an up-to-date copy of the requested content in its cache, it will respond to the request directly. If not, the CDN server will forward the request to the origin server, which will fill the request. CDN servers can also cache copies of responses to support future requests.
How does a CDN work with DNS?
The Domain Name System (DNS) translates domain names into IP addresses, which means that every request for web content begins with a DNS lookup. DNS-based CDN systems use DNS for request routing and redirection. When users request a specific web page, they will use the same domain name regardless of location.
However, the DNS server will respond based on the requester’s location, directing the user to the most convenient CDN server. This design leverages the design of DNS to perform request redirection without complex or inefficient additional infrastructure.
CDN application example?
Netflix is a good example of a CDN. Sites like Netflix serve users with large multimedia files, and at the same time, a positive user experience depends heavily on the fast delivery of this content to avoid video buffering.
Serving all video content from an origin server would be resource intensive and increase network latency. Instead, Netflix uses CDN servers spread across its service area. When users want to watch a video, their request will be filled by the most convenient CDN server, thereby reducing network congestion, lowering latency and video buffering.
Web Performance Optimization Instructions
When it comes to running a website, a great user experience is everything. On the one hand, user expectations are enormous; a website should provide interactivity, media and information, but on the other hand, the internet is evolving, making it increasingly difficult to provide a user-friendly website.
When we think about website speed, we consider various ways to optimize the loading speed of different elements, including web pages, images, videos, applications, and other elements that users save to their computers or download through their internet browsers.
A website with a high loading speed will have a better user experience, a better position in search engines, and a higher conversion rate (the number of website visitors who turn to customers)
