城市规划相关知识精讲班第22讲讲义（Urban planning related knowledge, lectures, lectures, lectures, twenty-second）.doc

城市规划相关知识精讲班第22讲讲义（Urban planning related knowledge, lectures, lectures, lectures, twenty-second） Urban planning related knowledge, lectures, lectures, lectures, twenty-second About computer networks The second section is the comprehensive application of network technology and information technology About computer network Connecting different computers with a communications network can make better use of the data stored by each computer, The connection of external equipment, processing and storage capacity. Currently, a simple network device is used to implement hundreds of meters A network of data communication and resource sharing between different computers within a distance, called Local Area (Network), Wide Area Network, a network for remote data communication, has almost unlimited communication distance. The technique of communicating isolated networks and communicating between networks is called the Internet, or Internet The technology can also be limited to within a unit, and this is called intranet (Intranet), Because external users can not directly access the intranet, its security is much better than that of the open internet. The computer connected to the network is often divided into two types: client and server. The hardware of the client is low and the software is simple, By the end user operation, the servers hardware performance is high, the software is complex, at the same time for the network of many users service, generally not Man on duty operation. Client software has a direct user interface for relatively simple data processing and complex processing A query from a large database sends requests to the server over the network. The server performs complex processing according to the clients request (such as finding data in a large database) The processing result is passed to the client (such as the data to be searched), and the client then contacts the user after processing the data and processing it as an interface. Therefore, between the client