A Simple Understanding of CDN (Content Delivery Network)

What is CDN?

A CDN (Content Delivery Network) is a geographically distributed network made up of proxy servers and data centres. Content Delivery Networks are a layer in the internet’s ecosystem which helps to reduce delays when loading webpages. This process works by decreasing the distance between the server and the user. Isn’t that amazing? Many businesses believe that it is and you should be with them. CDN operators are paid by content owners like e-commerce vendors and digital media companies to deliver customised content to their target end-users. With CDN, users can enjoy high-quality content without experiencing slow loading times. Security of the website is better, too. Some of the content provided by CDN include audio streams, 4K and HD quality videos, data records, software updates etc.

Where is CDN used?

CDN is the online backbone in charge of customised content delivery. In our day to day activities on the internet, you may not know it, but you interact with CDNs all the time. Every time you stream a video, shop online, read a blog online or surfing through various social media feeds, there is a good chance that your content provider uses CDN. No matter what you do, or what type of content you use. The chance that you’ll find CDNs behind every character of the text, every movie frame, and image pixel, delivered to your mobile browser or PC is pretty big.

How does it work?

Imagine that your website visitor is from Afrika, but your central server’s location is in Europe. The physical distance between these two locations is enormous. In a result, CDN will automatically detect the visitor’s location and promptly assign the closest geographically located server.

Let’s have a look at the image below.

The traffic arrives at the central server and then it’s direction changes to a specific web server which is closer to your visitors. The advantage of this is the balance of the load. Hence an increase in total capacity, scalability and reliability went through improvement, too. The process is happening through redistribution of the load from one to multiple servers. A switching layer made of up to 4 – 7 switches can be useful to create balance across several servers or web caches found within a specific network.

There is an option of creating your CDN, but we will talk about it in a different blog. We hope you enjoyed this article. For more information, please check out our other links, and if you have any question regarding CDN or anything else drop us message here or make a comment below.

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