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Functional composition is an approach for a flexible network architecture which enables a customized combination of functionality with respect to application requirements. Functional composition overcomes the inflexibility of the current Internet architecture and facilitates the management of functionality within the network. Several projects have addressed this topic with different aspects, in this paper several main challenges of network functional composition are identified and discussed. The development of the Internet during the last years has shown that it is difficult to integrate new functionality. Especially the core mechanisms (TCP/IP) are hard to change.
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