CDN

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Related to Web acceleration: Akamai

CDN

(Content Delivery Network) A distribution system on the Internet that accelerates the delivery of Web pages, audio, video and other Internet-based content to users around the world. The CDN replicates the content provider's files in servers, called "caching servers" or "edge servers," located in geographically dispersed datacenters. Most CDNs are third-party services; however, large companies may develop their own "enterprise CDN" (eCDN) to support remote locations more effectively.

When content is replicated throughout the country or the world, it is delivered to users with greater speed and reliability. The CDN network routes the user's request for content to the appropriate caching server based on the user's location. CDNs are often connected to multiple ISP backbones and have peering relationships with others, providing high availability to users.

Types of Services



Web Acceleration
Every CDN accelerates content delivery by nature of its multiple backbones (in most cases) and numerous caching servers. A CDN may also augment acceleration via compression between nodes in its own network. Quite often, only the graphics on a Web page are delivered by the CDN, while the HTML text is sent out from the customer's servers.

Streaming and Downloading
Video uses extensive network bandwidth, and many customers of a CDN use the service solely to stream video to users. A CDN may offer several streaming methods including Flash, Windows Media, Silverlight and progressive download, the latter using the same HTTP protocol as Web pages (see progressive download). Large downloads such as gaming software are also candidates for CDNs. The CDN may pull the data from the customer's origin server, or the customer may upload the files to the CDN.

Server-Side Processing
The CDN may offer server-side processing (Java, ASP, etc.). If the CDN does not do the processing, that operation takes place in the customer's servers, and the CDN can deliver the accompanying graphics or other downloads.

Hybrid CDN (Peer-to-Peer)
A CDN may support peer-to-peer processing, which requires client software to be installed in the user's computer or pre-installed in a set-top box.

The Vendors
As of 2020, Akamai, Google, Swarmify, Microsoft, Rackspace, Amazon and Limelight are among the largest CDN providers. See content peering.


Akamai's Control Center
Moving massive amounts of content every day, Akamai has a handle on the current state of the Internet. In mid-2008, Akamai's rotating world display (bottom) showed it was transmitting more than a trillion bits of data per second. See Akamai.


Akamai's Control Center
Moving massive amounts of content every day, Akamai has a handle on the current state of the Internet. In mid-2008, Akamai's rotating world display (bottom) showed it was transmitting more than a trillion bits of data per second. See Akamai.
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References in periodicals archive ?
Clarke says NetSanity's approach is different to rival Winfire, which recently launched its web acceleration tool, because it does not try to capture users by sending them through its servers and then on the content provider.
Both the phones make use of DataWind's breakthrough web acceleration technology to deliver the fastest internet browsing experience through the UbiSurfer browser.
Akamai, a CDN competitor to Verizon, purchased a slightly different form of web and caching acceleration in late 2011, paying a whopping $268 million for Cotendo, whose web acceleration services have been used by AT&T and others in the 3 years between Cotendo's founding and Akamai's acquisition.
In addition to WiFi connectivity, the device takes a regular SIM card, allowing the user to make calls or access the internet on its quad-band Edge modem - and with DataWind's special web acceleration technology it allows a fast and rich internet experience, anytime and anywhere," says Suneet Singh Tuli.
SGS, an inspection, verification, testing and certification company, has said there has been a 300% improvement in its web response times and a 600% reduction in bandwidth utilisation following an implementation of web acceleration technology from FineGround Networks.
Business applications platform provider Venation has enhanced its V-WEB web acceleration solution with the addition of a server resident component.