Digital infrastructures are thus the lowest layer of information systems. It is this hardware equipment, excluding software infrastructures, which allows the processing of data (supercomputers, server clusters, etc.), their transport (optical fibres, wifi terminals, computer routers, etc.) and their storage (computer servers, data centres, etc.). Data exploitation and ultimately the delivery of digital services are based on their level of performance, accessibility and robustness. The quality of these infrastructures is therefore a major challenge of competitiveness for the French scientific and pedagogical supply.