Network is an important component in an information system. In general, a complete network system can be divided into six major parts: the host system, LAN system, wide area network system, wireless network system, storage system and backup system.

　　Host System: This is an era of reliance on the network. That means we should have a powerful server and more room for expansion than in the past. The server must not only provide outstanding performance for today’s needs, but also can leave enough room for tomorrow’s development. It is mainly manifested in several ways of ability: Processor, memory, hard drive, slot for expended capacity, bus bandwidth disk transfer speed, fault-tolerant capacity, managerial capacity I/O capability etc.

　　The choice of the servers is mainly based on the application requirement. It can be broadly stated as follows:

　　LAN System:The construction of the network structure can be star-tree architecture. The networks can be divided into the core layer, convergence layer and access layer. Each layer has its own characteristics. Currently Gigabit Ethernet provides 1Gbps bandwidth to the network backbone based on the "Ethernet Technology". Gigabit Ethernet technology upgrades the existing Ethernet network, workstations, management tools and management skills in a natural way. Compared with the other fairly high-speed network technology, Gigabit Ethernet is low in price, and relatively simple. Gigabit Ethernet is a very successful 10Mbps Ethernet and 100Mbps Fast Ethernet connection standard extension.

　　Wide Area Network System：As a bridge to connect the internal systems and external systems, WAN is an important component of network system. The part of the WAN main function is to achieve internal information systems and information exchange between the external Internet, data, primarily reflected in the access to exports, the external information release platform, and security barrier under the premise of protecting the safety.