CDN

(redirected from acceleration services)
Also found in: Dictionary, Financial, Wikipedia.
Related to acceleration services: Web acceleration

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 Web users. A CDN may offer all popular streaming methods such as 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 of Java and ASP scripts. If the CDN does not provide server-side 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
Akamai Technologies (www.akamai.com), one of the first CDNs and by far the leader, delivers content for some of the largest content publishers in the world. As of 2008, Akamai, along with Limelight Networks (www.llnw.com) and CDNetworks (www.cdnetworks.com), had the lion's share of CDN revenues. Limelight keeps much of its customer traffic on its own international fiber network, and CDNetworks has extensive penetration in the Asian market.

Founded by DoubleClick executives in 2005, Panther Express, which later merged with CDNetworks, offered a progressive download service to content publishers of all sizes. Panther made it easy for small Web sites to come on board and expand. See content peering and Akamai.


Akamai's Control Center
Moving massive amounts of content every minute of the day, perhaps no other company in the world has a handle on the current state of the Internet as does Akamai. In mid-2008, its rotating world display (bottom) showed more than a trillion bits per second of content being transmitted at that moment.


Akamai's Control Center
Moving massive amounts of content every minute of the day, perhaps no other company in the world has a handle on the current state of the Internet as does Akamai. In mid-2008, its rotating world display (bottom) showed more than a trillion bits per second of content being transmitted at that moment.
References in periodicals archive ?
With Acceleration Services, our aim is to maximize Sentinel's full potential by offering additional resources, training and services to help our customers advance their application security programs.
At least some of the business education and acceleration services offered at the Central Louisiana Business Incubator.
The IPO already offers free acceleration services which mean a patent can be granted in less than a year.
A fast growing innovator of cloud-based acceleration technologies, Cotendo offers an integrated suite of Web and Mobile Acceleration Services from its global distributed point of presence (POPs).
Virtela offers an extensive suite of managed network, security, infrastructure management, and application acceleration services, which leverage a unique model that aggregates and integrates the best local, regional and global networks to offer unparalleled geographic reach.
Cotendo's CDN and cloud-based mobile and application acceleration services, combined with NetScaler cloud networking infrastructure running on-premise and in the cloud, reduce the latency and optimize the bandwidth of the CDN-to-datacenter network connection dramatically, while simultaneously securing all communications so that all data in transit is never compromised.
Virtela was recognized for its Cloud-Based Application Acceleration Service, the industry's first virtualized managed application acceleration service, which enables enterprises to escape the high cost and complexity of dedicated hardware appliances at each branch office.
NASDAQ: AKAM), the leading global service provider for accelerating content and applications online, today introduced the industry's first and only PCI-compliant site acceleration service.
Company's cloud-based application acceleration service, introduced last year, achieves strong adoption and business results from customers
509 Client Certificate Support Added to Secure Application Acceleration Service
Workbench Acceleration Services allows developers to fully integrate Workbench with their current development infrastructure and processes, enabling our customers to achieve a faster return on investment, and to optimize development of their devices," said Damian Artt, vice president of worldwide services at Wind River.
Akamai has been achieving market successes as the leader in the 'tornado' market of digital content distribution and application acceleration services.

Full browser ?