NDC is based on the network, to provide for centralized collection, storage, processing and sending data equipment operation and maintenance of facilities and service system. NDC to provide the main business includes VPS hosting (seats, racks, VIP engine room rental), rental of resources (such as virtual hosting business, data storage service) (the system configuration, system maintenance, data backup, troubleshooting, service), management services (such as bandwidth management, traffic analysis, load balancing, intrusion detection, and diagnosis of system vulnerabilities), and other support to run the service. NDC concept of a unified standard, but the concept can be understood as the public business of Internet rooms ", but it is also an IT professional services, is the critical infrastructure of the IT industry, the NDC is not only service concept and the concept of a network, which constitutes part of the network infrastructure resources, like the backbone network, access network, provides a high-end data transmission (DataDelivery) services and high-speed access services.