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Content delivery networks were actually functioning quietly in the background for a quite
long time. It was required since the emergence of Internet to ease the way web content could
Publishes & Stores Content
Publisher
Content Origin
Content Delivery Network
Transfer of published content
Authorizes
Subscriber
Content Request
Content Delivery
FIG 15.1: The model of Content Delivery Network263
be delivered to consumers. CDN first emerged towards the end of the last century to enable
websites to keep pace with growing Internet usage.
During that period, the CDN was being developed in United States to support growing
demand of newspaper like the New York Times for faster delivery of graphics via caches. Players
like Limelight and Akamai in particular led the development. That time it was commonly
referred as web acceleration which used to hoard frequently-requested content in servers closer
to the points of consumption.
In the very early days of Internet, web-content was almost entirely static. Hence the service
providers (ISP) used to segregate the parts of web pages which would rarely change and cached
them out in servers. With the increase in dynamic content, the service providers started
pushing the updated dynamic parts of pages on to the caches in real-time scenario.
In the early years of the current century, with the rapid increase in storage capacity and
network band-width, web sites started embedding video files. This abruptly increased the
amount of data CDNs had to handle. But, then the video content which were being embedded
to websites were all pre-recorded and hence were static. Delivery of such videos was not very
difficult as these were only large files to be delivered over the network.
But, with time the demand for live video streaming started increasing and this paved the
way for second generation of CDN. This time the focus shifted from static video content to
dynamic (live) videos. The focus of the new CDN system was on video-on-demand (VoD),
audio and video streaming with interactivity amongst the users. Additionally, the second
generation CDN focussed on cloud computing and content delivery for mobile users.
CDN operators, Akami and Limelight, led the development of the technology in initial years
Content delivery networks were actually functioning quietly in the background for a quite
long time. It was required since the emergence of Internet to ease the way web content could
Publishes & Stores Content
Publisher
Content Origin
Content Delivery Network
Transfer of published content
Authorizes
Subscriber
Subscriber
Content Request
Content Request
Content Delivery
Content Delivery
FIG 15.1: The model of Content Delivery Network263
Content Delivery Network
be delivered to consumers. CDN first emerged towards the end of the last century to enable
websites to keep pace with growing Internet usage.
During that period, the CDN was being developed in United States to support growing
demand of newspaper like the New York Times for faster delivery of graphics via caches. Players
like Limelight and Akamai in particular led the development. That time it was commonly
referred as web acceleration which used to hoard frequently-requested content in servers closer
to the points of consumption.
In the very early days of Internet, web-content was almost entirely static. Hence the service
providers (ISP) used to segregate the parts of web pages which would rarely change and cached
them out in servers. With the increase in dynamic content, the service providers started
pushing the updated dynamic parts of pages on to the caches in real-time scenario.
In the early years of the current century, with the rapid increase in storage capacity and
network band-width, web sites started embedding video files. This abruptly increased the
amount of data CDNs had to handle. But, then the video content which were being embedded
to websites were all pre-recorded and hence were static. Delivery of such videos was not very
difficult as these were only large files to be delivered over the network.
But, with time the demand for live video streaming started increasing and this paved the
way for second generation of CDN. This time the focus shifted from static video content to
dynamic (live) videos. The focus of the new CDN system was on video-on-demand (VoD),
audio and video streaming with interactivity amongst the users. Additionally, the second
generation CDN focussed on cloud computing and content delivery for mobile users.
CDN operators, Akami and Limelight, led the development of the technology in initial years