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Conceptual view of the interconnectivity between computing centres for the LHC. The Tier-1 centres are connected by dedicated links up to 10 Gbit/s to the Tier-0 centre at CERN, while Tier-1 and Tier-2 centres are interconnected by many research networks. All of the centres are also interconnected by the general-purpose Internet (indicated by the mesh). In this way any Tier-2 centre may access data at any Tier-1 centre.