What is a CDN? How CDN Works? CDN Guide

Content delivery network (CDN) is a great and useful development in web technology. It has changed the way the content is delivered to the users. Many people have heard about CDN, but they do not know what is a CDN and how CDN works. If you want to know more about content delivery networks, here is a simple and precise CDN guide that answers these crucial questions.


The primary function of a CDN is to deliver content more efficiently to the users. A CDN does this by replicating your website’s static content on different servers located in the different geographic locations. When a user makes a request for a web page through its browser, the files and data must be transferred from the server to the user’s browser in order to serve the web pages. For example, if a user in the United States requests a page from a server in the UK, the data must be transferred from the UK to the US every time. However, if the website uses a CDN, and it has a server located in the US, the data will be served from the US server reducing the time it takes for the data to be transferred thus increasing load speed. Additionally, the data doesn’t need to be transferred back and forth from the US to the UK reducing the bandwidth required.

When a user requests website data, the servers determines the user’s location from its IP address. Most CDNs have many servers scattered around the world, and they determine the server closest to the user and server the data from that server.

In addition to increasing load time, modern CDNs offer additional functions. They act as a firewall between the user and server blocking malicious attacks. They may also act as a backup of your website and keep serving the pages even if your primary web server goes down.

Read more about CDN at: engadget.com