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Network virtualization technology is believed to be a key enabler for the "Future Internet" as it allows to overcome existing ossifications and facilitates fast innovations. A crucial feature of this technology is the decoupling of virtual networks from the underlying substrate: Virtual Networks (VNets) can be mapped to those locations (subject to certain specification constraints) in the substrate network such that they consume the least amount of resources. Therefore, resource-efficient embeddings are one of the main concerns in network virtualization.
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