internet的基本知识（Basic knowledge of Internet）.docVIP

internet的基本知识（Basic knowledge of Internet） nameless Section 1 concepts and classifications of computer networks Second, the basic components of LAN Third section of network interconnection equipment Fourth section of the basic knowledge of Internet nets I. network and Internet 1. definition of network: The so-called computer network, that is, the use of communication lines and equipment, the distribution of different geographical locations in a number of computers connected. Computer network is the product of the combination of modern communication technology and computer technology. Communication between a computer and a computer in a network depends on protocol. An agreement is a rule for computers to receive and send data. TCP/IP: a set of communication protocols for networks. Including IP (Internet, Protocol) and TCP (Transmission, Control, Protocol) 2, modem (Modem) Both transceiver and receiver. It can be computer data (Digital) signal conversion (modulation) for analog (Analog) signal transmitted in a transmission line at the same time, can also be on the line transmission of the analog signal demodulation of digital signal is transmitted to the computer. 3, the development of the network The development of computer network can be divided into three stages: Remote terminal online stage: Host - terminal Computer network phase: Computer - Computer Internet phase: Internet 4., the main function of the network: (1) information resource sharing (2) data information transmission; (3) distributed processing (4) integrated information service; 5. classification of networks Divided by coverage area: LAN, metropolitan area network, Wan, Internet LAN: Local, Area, Network, abbreviated as LAN Metropolitan area network: Metropolitan, Area, Network, abbreviated as MAN Wan: Wide, Area, Network, abbreviated as WAN By topological structure: (network topology refers to the physical connection between nodes in the network), bus, ring, star (Shu Xing), mixed form: 6, data commun