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The solution requires in first place an Internet service programmable infrastructure.An Internet service programmable infrastructure enables application servers to be activated at any location on the Internet.Advances in networking and distributed systems research are improving Internet quality of service.
Application networks are a set of cooperating application servers, distributed throughout the Internet, connected and coordinated to provide application services with low latency, load balancing and/or good consistency.
Examples of application networks are content distribution networks such as Akamai [AKA01] or file discovery peer-to-peer networks such as Gnutella [Ora01].
Layer seven overlays providing network services are known as peer-to-peer overlays, since they use Internet client nodes as network nodes.
They provide network services such as multicast or active networking.
Setting up a new application network involves manually installing a set of application servers and manually configuring connections among them. Consider the case of a web caching service [Wes98].
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Deploying manually a proxy caching service requires as shown in figure 1.2: The cost of putting operational such web caching service can exceed the cost of hardware and software equipment it requires.
Newly created Internet application services are constantly appearing [Ami98].
However currently introducing new services is a manual process that involves several operators from different organization resulting in a slow, error-prone operation, especially for application network services.
They provide network services not provided by the underlying network: multicast, secure communications.
Layer seven overlays are composed of servers connected by application layer tunnels.