Content Delivery Network (CDN)
A Content Delivery Network/Content Distribution Network (CDN) is used for a quick transfer of assets required for loading internet content. Today the bulk of the website traffic is served through CDNs. A CDN is a group of interconnected servers that are distributed geographically.
The main reason for using CDNs is to reduce the time taken to send rich media and content to users and improve the website’s performance. A CDN is used to provide cached internet content from a network location closest to the user. This helps to speed up the delivery of content.
CDN can send website content like videos, images and files to various servers located around the world quickly and easily. It helps to improve the user experience for those visitors who are located away from the server that hosts the content. CDN helps to speed up the loading times of websites and reduce the workload on the server.
CDNs are widely used to help prevent interruptions in service, improve security and reduce the hosting bandwidth. It helps to relieve some of the problems faced with traditional web hosting.
The main benefit of a CDN is that it can deliver internet content through a network of servers in a secure way. CDNs can serve content like websites, mobile applications, streaming media and objects that can be loaded.
How do CDNs function?
The way the CDNs work is nearly transparent for the end users. In the process, software for CDN management is used to dynamically calculate and find which server is located closest to the end user. It then requests and delivers content depending on its calculations.
To deliver cached or new content the CDN edge servers send signals to the content’s origin server. Edge servers help to decrease the distance that the content has to cover and the hops the data has to make. This leads to faster performance, optimised bandwidth and less packet loss.
The process followed to deliver the content is as follows:
- Consider that in Mumbai a web server is hosting web content and it is requested by a visitor in Pune.
- When the server located in Mumbai gets a request it will send a signal to respond to the visitor in Pune. A CDN - POP (Point-Of-Presence) located geographically nearest to the visitor is also sent a copy of the signal.
- The copy of the signal is stored in CDN POP in the form of a ‘Cached’ file.
- If the same or another visitor in Pune makes the same request then the signal will be delivered by the ‘Caching’ server.
Benefits of using CDN
- CDN can distribute the content to a CDN server located near the website visitor and this leads to faster page loading times. As visitors tend to abandon slow-loading websites, CDN can help to reduce the bounce rate and increase the amount of time people spend on a website. If you have a faster website more visitors will stay.
- The main expense a website has is the bandwidth consumption costs for web hosting. Using optimisation and caching the CDNs can reduce the amount of data an origin server has to provide. This can help to reduce the hosting costs for websites.
- Sometimes a large amount of traffic or hardware failures can interrupt the website from functioning normally. A CDN can be used to handle more traffic and hardware failures in a much better way than the origin server. As a result, the content is readily available to the users.
- CDN offers services like distributed denial-of-service (DDoS) attack mitigation, web application firewalls and bot mitigation. This can help to improve security.
- CDN can deliver high-quality content like video or SaaS with an extremely low latency rate.
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