HomeNetworking BasicsWhat is a content delivery network (CDN)?

What is a content delivery network (CDN)?

What exactly is a Content Delivery Network (CDN)?

A CDN, short for Content Delivery Network, is a connected group of servers strategically located in different geographical locations to bring data physically closer to end-users. CDNs were designed to overcome the internet’s bottlenecks of speed, available bandwidth, location, etc.

Simply put, A Content Delivery Network (CDN) serves as a middle man between the content origin and the end clients. A perfect analogy would liken a Content Delivery Network (CDN) to retail chain store companies like Walmart, Target, Spar, etc.

They essentially bring the products, in this case, information, closer to the customer and also serve as a communication pathway to the main producer or manufacturer (Origin Server) in the event of mishaps.

A large part of the internet’s information is now more quickly served to a global audience through content delivery networks (CDN). Leading tech companies such as Facebook, Twitter and Amazon; make use of CDNs to improve the performance, redundancy, and security of their websites.

Examples of notable content delivery network companies include Akamai, Cloudflare, and Fastly. These are but a few of the options available on the market today.

Choosing a specific CDN platform is a process which largely depends on which company provides the correct package, performance and budget to match your needs.

Use of CDNs offers many advantages to both large and modest internet enterprises.

What a Content Delivery Network (CDN) does?

A CDN acts as a buffer between a website and clients trying to access it. Content Delivery Networks capture and upload snapshots of registered websites to their servers closer to end-users in various locations.

This static clone of the original website is then served to clients trying to access the original website from remote locations.

In essence, CDNs replicate and distribute data to more accessible storage facilities to accelerate the retrieval process of data.

How Content Delivery Networks (CDNs) work?

A CDN is a web of connected servers spanning a large geographical area, providing sources of information that are physically closer to website visitors.

A CDN duplicates data from an origin server and distributes it within its network of servers. These servers are called Points of Presence (PoPs).

Points of Presence (PoPs) are responsible for delivering content to visitors in their territory. This means that these visitors will communicate faster with their local PoP without interfacing directly with the far off hosting server.

The benefits of CDNs

Faster Website Loading Times

Physically closer copies of websites mean less time is wasted transmitting requests and responses over long distances.

Faster communications between users and local servers imply that websites will load faster and be more responsive leading to increased client satisfaction.

Reduced Load on your website’s server

CDNs acting as a buffer and proxy for the origin server means that less traffic directly reaches the website.

Consequently reducing the hosting server’s bandwidth and resource usage leading to improved performance.

Ability to handle Higher Traffic Loads

Because Content Delivery Networks (CDNs) have multiple servers, they can absorb surges in traffic to your website for you.

They can also distribute the traffic load across their points of presence (PoPs) so that your website remains undisturbed.

Reduced Bandwidth Consumption

As a result of the reduced traffic going to and fro from an origin server, the amount of data required directly from the site’s hosting server is minimized. Giving rise to lower bandwidth charges from the website’s hosting service.

Improved Security

Content delivery networks provide many security features, e.g. web application firewalls. Additionally, CDNs function as a barrier between your website and malicious agents. They provide security through the obscurity of your origin server.

Some CDN platforms not only protect you from incoming attacks but they will also detect and block suspicious outgoing messages from an already compromised site.

Backups and Redundancy

CDNs provide websites with multiple channels of providing their content. This ensures that in the event of a malfunction in the chain of content delivery, the website will stay online. For instance, if your website hosting service shuts down, your website won’t shut down with it.

Moreover, if your main server is compromised and you are left with corrupted files, redundancy allows you to restore your files from the CDN’s servers.

Ease of Scaling Up

Expanding businesses can scale up their operations without needing to personally deploy extra infrastructure. This leads to lower operational costs and higher profitability for growing businesses.

Protection from DDoS attacks

Distributed Denial of Service (DDoS) attacks frequently happen on the web. They aim to flood your website with excessive traffic to exhaust all your website’s available bandwidth.

Content Delivery Networks have a much larger capacity to soak up this malicious surge in traffic. Ensuring your website continues to operate without experiencing any downtime.

Who needs a Content Delivery Network (CDN)?

CDNs facilitate faster content delivery to clients. These companies not only hold webpage components like HTML, javascript, and CSS files but they can also host operating system updates, HD video, audio streams, etc. The use case scenarios of CDNs are many, with many more to be unearthed.

In summary, if you run a website or online service interacting with a global audience, you need a CDN. A CDN subscription will enhance the performance, reliability, and security of your website or service.

On the other hand, if you run a strictly localized website with most of your visitors located in the same region as your web host, using a CDN will offer you limited performance enhancements. However, acquiring a CDN’s redundancy and security is still something you might have to consider.



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