Data centres are simply centralized locations where computing and networking equipment is concentrated for the purpose of collecting, storing, processing, distributing or allowing access to large amounts of data.
Depending on the type of data center, it uses a different network technologies and equipment. Corporate data centres tend to serve many applications. They can be either 200 (small companies), or 1000 servers (large companies). Parts of corporate data centers have closed structure, designed to optimize the IT applications and services. Only a few vertical structures (oil and gas exploration, biotechnology, or any other areas in which IT infrastructure is crucial for the competitiveness of companies) may also include high- performance computing clusters (HPCC) at its data centers, designed for thorough scientific analysis. Many corporate data centers also have an open structure, designed for customer service. They maintained internal and external bandwidth, depending on the type of application.