CDN

(redirected from Content Delivery Network)
Also found in: Dictionary, Financial, Acronyms, Wikipedia.

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 2018, 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.
References in periodicals archive ?
The report on North America Content Delivery Networks market provides in-depth analysis of the regional adoption trends, future growth potential, key issues and opportunities in the considered market.
Adoption of OTT Services and Streaming Video Continues to Spur the Growth of Content Delivery Networks
Our world-class content delivery platform provides customers the cost benefits and flexibility of controlling their own content delivery network while freeing them from capital investments and operational hassles.
Revenues Forecast and Trend Analysis for the World Total Content Delivery Networks Market
EdgeCast has built a global content delivery network designed for today's rich media Internet.
After an extensive review of content delivery networks, POPview selected Mirror Image based on unique technical competencies and abundant executive input signifying the commitment to long-term partnership needs.
Combining Akamai's high-performance digital media content delivery network with Multicast's cost-competitive turnkey solutions, a business of any size is now well equipped to execute on its digital media strategy.
LAS VEGAS -- iStreamPlanet, a leading media digital rights management (DRM) and managed webcasting solutions provider, today announced it teamed with Limelight Networks, the world's leading content delivery network for digital media, to deliver the popular webcast of the 2006 Olympia Weekend over the Internet.
Since its beginning, it has provided Content Delivery Network (CDN) services and solutions based on a Private Backbone Network that interoperates the top 3 IDC centers (KT-IDC, KIDC, Ngene) in the region.
SAN FRANCISCO -- UpStream Networks, a leading provider of Internet streaming and content delivery services, today announced the launch of its new ServePOP(TM) Content Delivery Network.
Switch and Data today announced an expanded colocation and peering agreement with Limelight Networks, the world's leading high performance content delivery network for digital media.
Force10 Networks(R) today announced that CDNetworks, South Korea's leading content delivery network provider, is increasing the scalability of its high performance network with the TeraScale E-Series(R) family of switch/routers.

Full browser ?