What is Content Delivery Network and how it works?

In today’s world, where everybody is in rush and barely have time for anything. Everybody expects a quick result. Be it personal work, professional work or something else. As we all live in digital era. Where everything is dependent on internet. As we know internet has to go through lots of challenges to serve us online. Hence it requires a solutions to make things faster. To overcome such challenges and make things faster we need something called CDN. Which stands for “Content Delivery Network” or “Content Distribution Network”.

Content Delivery Network Illustration
Content Delivery Network Illustration

In This paragraph, I am going to discuss more about it.


  1. What is CDN?
  2. How to use CDN ?
  3. Advantages of using CDN?
  4. Dis Advantages of using CDN?
  5. List of few Content delivery service providers ?

So, lets begin content delivery network is a geographically distributed network of proxy servers and their data centers.

Now, What is proxy servers?

Proxy Servers are those servers act as a mediator between client and servers without their knowledge. Information sharing in here is totally protected.

You can understand more about it by seeing illustration below.
Proxy Server
Proxy Server(Shown in Red)

Lets understand with the help of above illustration. In here as you can see Alice wants an information from Bob. However these both computers connected through a third computer (shown in red) which works as a proxy server. Bob does not know to whom the information is going. On the other hand Alice does not know whom did he requested an information. with the help of proxies server we can protect privacy.

Next, lets see……

What is Data Center?

A Data Center or Data Centre is a place, a building, dedicated space with a building or group of such places use to store computer systems or servers and associated components. Such as communication wires, cables, storage systems etc.

You can understand better with the help of illustration below.
Data Center
Image of Data center, server room or server computers

So far, I have explained you about CDN. Now lets see Advantages and Disadvantages of using CDN.

Firstly, I’ll explain you benefits of using CDN after that I’ll talk about few drawback of it.

Advantages of CDN

1) 100% availability and constant uptime

Downtime is always a disaster for both you and your users who can’t reach the content they want. So, you do server monitoring, and check whether your site is up or down, and hope with crossed fingers that your website’s server will be up and running and your content will remain available to site visitors even in stressful situations. These risky situations could be periods of enormous user traffic, intermittent spikes, or server outages.

2) High speed of content delivery

The network of CDN servers is spread over vast territory. Basing on geographic location, CDN delivers content from its servers which are the closest to a particular user or group of users. This makes the content’s path as short as possible. That’s why users receive your content as fast as possible. Your users don’t have to wait nervously and they get a positive user experience.

3) Control of asset delivery

Asset delivery and network load are able to be controlled. Operators can monitor load statistics at real time. This allows them to detect active regions that are suffering from overload on the server and need to be prioritized. So operators can direct extra bandwidth to those regions and provide them with extra capacity. 

Secondly, Uses of CDN has few drawbacks as You can read below.

Disadvantages of CDN

1) Additional Costs  

Sure, you can choose one of a few free of charge CDN services, for example, BootstrapCDN, Coral Content Distribution Network, CloudFlare, or Incapsula. However, most of the content delivery networks ask you to pay a monthly fee, which depends on the number of requests, site visitors and resources you have on your site. Taking into account your hosting plan, general spendings per month could be considerable. The costs will be justified, as you’ll be more safe, but it’s worth checking beforehand to make sure you can afford this.

2) Support issue

CDN is a very efficient and useful network, if it works smoothly, because there is always the issue of support availability. Most companies use third-party vendors to run and support their CDNs. If some big problems appear, there’s the question of whether the operator will be able to solve them at once. How many time will it take to fix outages? Will the operator be able to prevent the same situation from happening again? Luckily, these issues don’t occur very often, but when they do, they cause troubles.

3) Geo-location may play tricks

Companies that offer content delivery networks have servers situated on territories of many countries all over the world, but nonetheless, they may not have them in your country or in a place where your main audience goes online. In these rare cases CDN is not advantageous as it takes longer for the page to render than if you keep all your resources on an original server only. 

Related Topics:

1) What is Computer Network and characteristics of it?

2) Tips & Trick of using Nginx Server ?

3) Types of Ports in Computer ?


5) What is Docker & why docker is useful for deployment ?

In Conclusion, I have explained you about Content Delivery Network with Advantages and Disadvantages of using it.

Hope, My information was useful for you. If you have any queries or doubts please write it down in comment below or feel free to ask.

Thanks for reading.


Leave a Reply

Your email address will not be published. Required fields are marked *