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With the birth and growth of the Internet and high-speed access links,
Internet users can enjoy large amounts of web content on the Internet.
However, network congestion and server overload have become major
concerns for content delivery.
In Cached-Contend Distribution Networks, web content is distributed
to cache servers located at the edge of the Internet close to clients,
and the cache servers deliver content to clients if they cached the
requested content beforehand.
Since the cached content does not have to be delivered from the
origin servers to the cache servers, this leads to lower latency for
users, better network resource utilization for network operators, and
scalable service provisioning for content providers.
Content engines can be deployed in the data center or branch offices
to optimize WAN bandwidth, accelerate deployment of mission-critical Web
applications, add Web content security, and deliver live and on-demand
business video.
With the addition of a device such as a Cisco Content Distribution
Manager, all caching and content-delivery services and devices can be
centrally managed. To redirect users to the best source for content,
devices such as a content router can be added.
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