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What Is A CDN & Why Is One Essential If You Own A Domain

What Is A CDN & Why Is One Essential If You Own A Domain (image DigitalOcean)
What Is A CDN & Why Is One Essential If You Own A Domain (image DigitalOcean)
What Is A CDN & Why Is One Essential If You Own A Domain (image DigitalOcean)
What Is A CDN & Why Is One Essential If You Own A Domain (image DigitalOcean)

Makes users and search engines much happier

A content delivery network (CDN) may be a collection of servers distributed across the planet that delivers pieces of your website to site visitors located near those servers.

The most common use of a CDN is for the delivery of images from an internet sitethis is often because images are usually the slowest-loading component of an internet page.

What Is a CDN?

A CDN isn’t an internet host. It simply catches the parts of your website that you’ve found out to be served by a CDN. These saved (cached) files are uploaded to all or any of the various servers across the planet.

When a visitor from another country visits your website, they receive the text directly from your web host, but they’ll receive a variety of other files from the CDN server nearest their location.

These files may include:

  • Javascript files
  • Images
  • Videos
  • Stylesheets

The demand for CDN services skyrocketed when Google started using page load speed together variable in its ranking algorithm.

This race to become the fastest loading page on a subject required website owners to hunt out alternatives for slow-loading images on the location. The distributed, cached, CDN network was the right solution.

Why a CDN Is Essential For Your Site

If you own an internet site, the speed that pages load is vital for a couple of reasons. As mentioned above, it’ll boost your overall ranking score with Google.

Secondly, it improves the experience visitors wear your website. this may make them stay your website longer, and visit more pages thereon.

Here are a couple of other ways a CDN is important for your website.

Saves Bandwidth

Using a CDN, you’re shifting the bandwidth use off of your web host’s server and onto the distributed network of CDN servers instead.

Once you found out your CDN account and set it up together with your domain, you’ll see that bandwidth starts to accumulate in your account dashboard.


This is the bandwidth demand you’re removing from your web host’s server. With web hosting services as expensive as they’re – and really often being charged for using more bandwidth – curtailing on bandwidth usage usually equates to significant cost savings.

CDN bandwidth costs are far cheaper than web hosting costs. this is often because CDN services found out their server network to manage high bandwidth content like images. they are doing this within the following ways.

  • CDNs use optimizations like server load balancing and steady-state drives, which speed up the transfer and reduce errors.
  • Through file size manipulation techniques like file compression and minification, CDNs reduce the amount of data that’s transferred.
  • Using SSL/TLS certificates, CDNs can reduce false transfer starts, which avoids the need to restart a transfer and send even more data.

Reduces Downtime

When it involves reliability, there are few things that reduce your website downtime quite employing a CDN service.

This increased uptime is thanks to a variety of reasons.

The distributed CDN network means the majority of your bandwidth – images – are coming from multiple servers from everywhere the planet. CDN services use away called “load balancing”, which suggests that when there’s excessive demand from one server, other servers are wont to balance out the load.


Whenever your website traffic spikes significantly, it puts tons of demand on multiple pieces of hardware. Specifically, the online server in your web host’s data center, and therefore the distributed servers managed by your CDN service.

And since images and files are the most important bulk of the info being transferred, that’s where the bulk of demand will occur.

The fact that CDNs manage that demand across multiple load-balanced servers means your site are going to be ready to handle significantly more traffic than if you weren’t employing a CDN service.

Improves Security

You may be surprised to learn that using a CDN can also increase your site security.

To understand this, first, it’s important to understand the flow of data when visitors come to your website.

In a single web server setup, visitors make a request for a web page, and your web server needs to respond with all of the data – including text, images, javascript, and stylesheets. All of that bandwidth demand impacts your one web server.

Picture this like a dam with multiple water ports. In this scenario, it would be a dam with just a single port for water to flow through. It wouldn’t take too much of a water surge for the dam to be overburdened and water to start flowing over the top.

This is why most dams are built with multiple ports that can be opened as the water level rises on the other side.


If you have a website hosted on a single web server, it takes much less effort on the part of a DDOS attacker to take down your website.

DDOS attacks are launched from many different “bots” from around the world, simulating hundreds or even thousands of users making requests against your web server all at the same time.

However, by using a CDN service with distributed web servers around the world, all of those servers are like additional ports in the dam.

Now your web server only needs to serve text, and multiple CDN servers provide images and other files. All of these servers are essentially sharing the bandwidth demand.

This won’t provide 100% protection against DDOS attacks, but it will require that the effort the hackers put into the attack be much larger before your website goes down.


In addition, if you make sure to set your CDN up with TLS/SSL certificates, all traffic will be encrypted and protected from hackers intercepting the web traffic.

How to Set Up Your CDN Service

While a CDN service may sound complicated, setting it up is fairly easy.

First, you need to choose a CDN service. There are a few major ones to choose from.

  • Cloudflare: One of the largest and most well known CDN services used by many major businesses across the world.
  • Fastly: Offers a number of web optimization products, including CDN content delivery.
  • KeyCDN: Manages 34 data centers located all across the world, with proven website speed performance.
  • MetaCDN: Unlike other CDN services that charge based on usage, this service charges a flat monthly fee.
  • StackPath: Formerly MaxCDN, StackPath is used by many companies and websites around the world.

Any of these services will provide sufficient CDN optimization for your site. If your site is small, it’s better to go with a usage-based pay model since your bandwidth will likely below. If you have a large website or business, the fixed-rate model would be better.

Once you’ve signed up for a CDN service, you’ll need to set up your CDN zone in your account.


Setting up the account simply involves providing the name of your domain, and configuring caching and compression. Typically, it’s fine leaving these settings as default.

Make note of the CNAME hostname provided by your CDN. You’ll need this later.

Finally, you’ll need to install a CDN plugin on your site. For example, if you’re running a WordPress site, W3 Total Cache is a popular option.

Once you install the plugin, you’ll see a field available where you can enter the CNAME provided by your CDN service.


You’ll also find a section where you can enable what type of files on your website you want the CDN service to cache and provide to visitors.


Once you’ve saved all changes, you should see the CDN bandwidth charts start reflecting visitors over time. It may some time for the changes to replicate throughout the Internet, but the DNS changes should update after about 24 hours.

Given the performance and security benefits provided by a CDN service, you can’t afford to configure it for your website.

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