Content Delivery Network
Heya Guys If you landed on this
page after searching for: What is CDN?, Working of CDN, Need of CDN, Example of CDN and lots more random searches then you are at the right place,
Scroll down and explore about CDN. If you have something more to write about
it, then you are welcome. Happy surfing.
What is the need of
CDN?
The interaction between a user and online content is more
complex today than it was a few years ago. Today’s users are much more likely
to be streaming a longer video from a mobile phone or a laptop. These are far
more complex experiences that did not existed in the past. Here arises the
expected growth of the CDN market in the coming years, this blog will let you
know what a CDN is and how does it work.
What is CDN?
A Content Delivery
Network or Content Distribution
Network (CDN) is a globally distributed network of proxy servers deployed
in multiple data centres. The goal of a CDN is to serve content to end-users
with high availability and high performance.
Example:
In the example shown below, you will see arunkalesh’s’
Twitter stream. Content in red, is
known as static content. arunkalesh’s logo and profile descriptions are basic
graphics and HTML text that change very rarely. Content in yellow, is known as dynamic content. The Twitter stream
represents content that is always changing and moving. Similarly, Facebook’s
status updates are also dynamic content. Hope you got a clear idea about static
and dynamic content and let us scroll down to see how the CDN serves for the
same.
How CDNs Work:
A Content Delivery Network stores a cached version of its
content in multiple geographical locations(a.k.a., points of presence, or
PoPs). The Points of Presence (PoPs) or data centers that are situated around
the world contains a number of caching servers responsible for content delivery
to visitors within its proximity. Between each Points of Presence there are
hundreds or thousands of servers. The PoPs and servers helps in reducing the
time required to deliver the content by increasing its speed to the user.
From the below shown image we can represent a web page which
works without the CDN( Content
Delivery Network). When a user requests a page containing both static and
dynamic contents. The content for the web page is retrieved from the website’s
origin server. In the below image, you can see a user requesting the content
retrieves it all the way from across the globe.
Whereas below images represent how a web page loads content using a CDN. A CDN caches all files in the local servers. As a result, when an end user requests a web page, it loads faster.
In short a CDN provides the user with the best experience
while interacting with the Website’s content irrespective of the location. If
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