计算机概论相关知识（Knowledge of computer introduction）.doc

计算机概论相关知识（Knowledge of computer introduction） 1, the computer network is through the cable, telephone line or wireless communication computer interconnected collection of more than two. The development of the computer network experience of the computer network and the open standard single level computer network computer network, computer network terminal oriented three stages. The computer network is mainly reflected in three aspects: information exchange, resource sharing, distributed processing. The exchange of information This is the most basic function of computer network system, mainly completes the communication between nodes in a computer network. Users can send e-mail on the Internet, news release, electronic shopping, electronic commerce, electronic remote education etc.. The sharing of resources The so-called resource is refers to all elements of the system, including the software and hardware resources, such as information about computing power, large capacity, high speed disk printer, plotter, communication line, database, and other files on the computer. Due to the constraints of economic and other factors, these resources are not (cannot) all users can independently owned, so computers on the network can not only use their own resources, also can share the resources on the network. To enhance the processing ability of computers on the network, improve the utilization rate of computer hardware and software. The distributed processing A complex task can be divided into many parts, by the computer network to complete the parallel cooperation respectively, the performance of the whole system is greatly enhanced. 2 network topology 1, star topology Star topology is composed of a central node and the communication link to point to the central node is composed of each site received. Star topology has the following advantages: (1) simple control. (2) fault diagnosis and isolation easy. (3) convenient service. The disadvantages of star topology: (1) the length