Content Delivery Network – CDN – Part 1

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According to market estimates, the CDN market will grow to $12.6 billion by 2019, with North America expected to be the largest in terms of revenue contribution. (As of 2014, the CDN market was at $3.71 billion.)

What is Content Delivery Network (CDN)

A content delivery network or content distribution network (CDN) is a globally distributed network of proxy servers deployed in multiple data centers. The goal of a CDN is to serve content to end-users with high availability and high performance. CDNs serve a large fraction of the Internet content today, including web objects (text, graphics and scripts), downloadable objects (media files, software, and documents), applications (e-commerce, portals), live streaming media, on-demand streaming media, and social networks.

What are benefits of CDN Service?

This service is effective in speeding the delivery of content of websites with high traffic and websites that have global reach. The closer the CDN server is to the user geographically, the faster the content will be delivered to the user. CDNs also provide protection from large surges in traffic. Servers nearest to the website visitor respond to the request. The CDN copies the pages of a website to a network of servers that are dispersed at geographically different locations, caching the contents of the page.

The benefits of using the CDN to cache web site assets are as follows

  • Better performance and user experience for end users, especially when using applications where multiple round-trips are required to load content.
  • Large scaling to better handle instantaneous high load, like at the start of a product launch event.
  • By distributing user requests and serving content from edge servers, less traffic is sent to the origin.

How CDN Service works?

To minimize the distance between the visitors and website’s server, CDN service stores a cached version of its content in multiple geographical locations (i.e. points of presence- PoP). Each PoP contains a number of caching servers responsible for content delivery to visitors within its region.

How CDN works
How CDN works

Who provides CDN Service?

Privately owned companies provide CDN service. Also generally speaking, all Internet service providers can provide a content delivery network.

There are few companies who provide free services too, following are few of them.

Free CDNs

Commercial CDNs
Many companies provide commercial CDN services, following are few examples.

Telco CDNs
Telephone service providers are provide CDNs services, following are few of them

What is Multi CDN?

Different CDNs tend to vary in performance in different areas, and some may offer a better service in video optimization.

Multi-CDN is the practice of using more than one CDN provider in order to further improve latency and uptimes on a global scale. While one CDN may be enough in a certain locality, a site owner may choose to implement further CDNs that have data centers in geographical areas where the main supplier isn’t highly represented.

Multi CDN providers


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