What is CDN ? how CDN work?

What is CDN?
Content Delivery Networks have been around since the
early 90s, but only recently have they started
making big waves for smaller companies and colossal
corporations alike. Content delivery platforms are
an elemental component of internet infrastructure.
Without CDN hosting, thousands of websites are bound
to load slow–not to mention crash and go offline.
A Content Delivery Network, or a CDN as it is commonly called, is an
essential part of any modern website and application. The content that
you view on your phones today, on any website or app, videos or
images, or any other kind of content, is very likely to be delivered using
a content delivery network.

Benefits of CDN
With a CDN coming into the picture, it does two things. One, a lot of traffic doesn't
even come to your servers. The edge server of the CDN serves a lot of content from its
cache. So, you need a slightly fewer number of servers.
Second, as long as the content is available in the CDNs cache, even if your actual
servers are not working, the CDN will keep serving the content. This gives you some
buffer time to fix issues on your servers while the CDN serves whatever content it can
from its cache.
Since the CDN PoP or edge server is now the first layer in the system which accepts
incoming traffic, it also becomes the first line of Defence against your server.
CDN can isolate bad traffic from good traffic, it can stop all the bad traffic from
coming to your servers. Your servers only respond to the "good" requests coming from
actual users.

Benefits of CDN
Reducing bandwidth costs - Bandwidth consumption costs for website hosting is a
primary expense for websites. Through caching and other optimizations, CDNs are
able to reduce the amount of data an origin server must provide, thus reducing hosting
costs for website owners.
Increasing content availability and redundancy - Large amounts of traffic or
hardware failures can interrupt normal website function. Thanks to their distributed
nature, a CDN can handle more traffic and withstand hardware failure better than
many origin servers.
If you want to maintain high-quality performance and user experience as you grow
your online presence, a reliable content delivery network is a worthy investment. It is
especially important if your website has a wide audience reach around the world.
Using an interconnected group of CDN servers spread across the world can help
reduce bandwidth usage, provide load balancing, improve site speed and
performance, strengthen website security, and offer fast content delivery for all site

How does a CDN work?
At its core, a CDN is a network of servers linked together with the goal of
delivering content as quickly, cheaply, reliably, and securely as possible. In
order to improve speed and connectivity, a CDN will place servers at the
exchange points between different networks.
These Internet exchange points (IXPs) are the primary locations where
different Internet providers connect in order to provide each other access to
traffic originating on their different networks. By having a connection to these
high speed and highly interconnected locations, a CDN provider is able to
reduce costs and transit times in high speed data delivery.
Beyond placement of servers in IXPs, a CDN makes a number of
optimizations on standard client/server data transfers. CDNs place Data
Centers at strategic locations across the globe, enhance security, and are
designed to survive various types of failures and Internet congestion.

Applications and use of CDN
•Advertising
•Media and entertainment
•Online gaming
•E-commerce
•Mobile
•Healthcare
•Higher education
•Government

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What is CDN ? how CDN work?

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What is CDN ? how CDN work?