(Network construction IDC mainly relies on having a high-performance network to provide services for its customers, including its-AN, WAN and Internet access. IDC's network construction mainly includes: -IDC's -AN construction, including its -AN infrastructure, -AN level, -AN performance. -The construction of the WAN of the IDC, that is, the construction of the wide area network connecting the branches of the IDC to each other. - IDC's user access system construction, that is, how to ensure that IDC users transmit data to the data core of IDC in a safe and reliable way, or maintain their own equipment stored in IDC, which requires IDC to provide users with corresponding access mode, such as dial-up access. -Construction of IDC and Internet interconnection. - IDC's network management construction, because IDC's network structure is quite large and complex, to ensure uninterrupted external services of its network, and high performance, there must be a high-performance network management system. Server construction Storage system construction Software system construction IDC own service system construction Computer room site construction......)