شبكة توصيل المحتوى

(إلى اليسار) التوزيع من خادم واحد
(يمين) مخطط CDN للتوزيع

شبكة توصيل المحتوى Content delivery network أو شبكة توزيع المحتوى (CDN) هي شبكة موزعة جغرافياً من خوادم الوكالة و مراكز بياناتها. الهدف هو توزيع الخدمة فراغياً بالنسبة للمستخدمين النهائيين لتزويدهم بتواجد وأداء عاليين. وتخدم شبكات توصيل المحتوى جزءاً كبيرا من محتوى الإنترنت، حالياً، بما في ذلك أغراض الوب (النصوص والرسم والبرامج)، والأشياء القابلة للتنزيل (الملفات الإعلامية وبرامج الحاسوب والوثائق)، والتطبيقات (التجارة الإلكترونية والبوابات)، وإعلام البث الحي على الإنترنت وإعلام البث حسب الطلب على الإنترنت والشبكات الاجتماعية.

CDNs are a layer in the internet ecosystem. Content owners such as media companies and e-commerce vendors pay CDN operators to deliver their content to their end users. In turn, a CDN pays ISPs, carriers, and network operators for hosting its servers in their data centers.

CDN is an umbrella term spanning different types of content delivery services: video streaming, software downloads, web and mobile content acceleration, licensed/managed CDN, transparent caching, and services to measure CDN performance, load balancing, multi-CDN switching and analytics and cloud intelligence. CDN vendors may cross over into other industries like security and WAN optimization.[1]

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التكنولوجيا

CDN nodes are usually deployed in multiple locations, often over multiple أعمدة فقرية. Benefits include reducing bandwidth costs, improving page load times, or increasing global availability of content. The number of nodes and servers making up a CDN varies, depending on the architecture, some reaching thousands of nodes with tens of thousands of servers on many remote points of presence (PoPs). Others build a global network and have a small number of geographical PoPs.[2]

Requests for content are typically algorithmically directed to nodes that are optimal in some way. When optimizing for performance, locations that are best for serving content to the user may be chosen. This may be measured by choosing locations that are the fewest hops, the least number of network seconds away from the requesting client, or the highest availability in terms of server performance (both current and historical), so as to optimize delivery across local networks. When optimizing for cost, locations that are least expensive may be chosen instead. In an optimal scenario, these two goals tend to align, as edge servers that are close to the end-user at the edge of the network may have an advantage in performance or cost.

Most CDN providers will provide their services over a varying, defined, set of PoPs, depending on the coverage desired, such as United States, International or Global, Asia-Pacific, etc. These sets of PoPs can be called "edges", "edge nodes" or "edge networks" as they would be the closest edge of CDN assets to the end user.[3]

The CDN's Edge Network grows outward from the origins through further acquisitions (via purchase, peering, or exchange) of co-locations facilities, bandwidth, and servers.


تقنيات تشبيك المحتوى

The Internet was designed according to the end-to-end principle.[4] This principle keeps the core network relatively simple and moves the intelligence as much as possible to the network end-points: the hosts and clients. As a result, the core network is specialized, simplified, and optimized to only forward data packets.

Content Delivery Networks augment the end-to-end transport network by distributing on it a variety of intelligent applications employing techniques designed to optimize content delivery. The resulting tightly integrated overlay uses web caching, server-load balancing, request routing, and content services.[5] These techniques are briefly described below.


مناحي شبكات توصيل المحتوى

بزوغ شبكات توصيل المحتوى التابعة لشركات الاتصالات

The rapid growth of streaming video traffic[6] uses large capital expenditures by broadband providers[7] in order to meet this demand and to retain subscribers by delivering a sufficiently good quality of experience.

To address this, telecommunications service providers (TSPs) have begun to launch their own content delivery networks as a means to lessen the demands on the network backbone and to reduce infrastructure investments.

أبرز مزودي خدمة توصيل المحتوى

المجانية

التجارية التقليدية

التابعة لشركات الاتصالات

التجارية التي تستخدم P2P للتوصيل

الشبكات المتعددة

Generally speaking, all Internet service providers can provide a content delivery network.

انظر أيضاً

الهامش

  1. ^ أ ب ت Dan Rayburn (2017-02-13). "Latest List Of CDN Vendors Selling To Broadcasters, Carriers and MSOs" (in الإنجليزية الأمريكية). StreamingMediaBlog.com. Retrieved 2017-02-24.
  2. ^ "How Content Delivery Networks Work". CDNetworks. Retrieved 22 September 2015.
  3. ^ "How content delivery networks (CDNs) work". NCZOnline. Retrieved 22 September 2015.
  4. ^ Saltzer, J. H., Reed, D. P., Clark, D. D.: “End-to-End Arguments in System Design,” ACM Transactions on Communications, 2(4), 1984
  5. ^ Hofmann, Markus; Leland R. Beaumont (2005). Content Networking: Architecture, Protocols, and Practice. Morgan Kaufmann Publisher. ISBN 1-55860-834-6.
  6. ^ "Online Video Sees Tremendous Growth, Spurs some Major Updates". SiliconANGLE.
  7. ^ "Overall Telecom CAPEX to Rise in 2011 Due to Video, 3G, LTE Investments". cellular-news.
  8. ^ أ ب ت ث ج "How CDN and International Servers Networking Facilitate Globalization". The Huffington Post. Delarno Delvix. Retrieved 9 September 2016.
  9. ^ https://cdn.net

للاستزادة

قالب:E-book digital distribution platforms

قالب:Software digital distribution platforms

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