网络基础知识与习题（国外英文资料）.docVIP

网络基础知识与习题（国外英文资料） One, the Internet and the Internet The definition of the web: The so-called computer network is the use of communication lines and equipment to connect multiple computers in different geographic locations. The computer network is a combination of modern communication technology and computer technology. The communication between computers and computers in the network depends on the agreement. Protocols are the rules for computer collection and data. TCP/IP: a set of communication protocols for the network. Including IP (Internet Protocol) and TCP (Transmission Control Protocol) Modem (Modem) Both transceiver and receiver. It can transform computer data (Digital) signal (modulation) for Analog (Analog) signals in the transmission lines for transmission, and at the same time line can be transmitted over Analog signal demodulation back into Digital signals to a computer. The development of the Internet The development of computer networks can be divided into three stages: Remote terminal online stage: host - terminal Computer network stage: computer - computer Stage of the Internet: the Internet The main function of the network: (1) information sharing (2) data transmission (3) distribution processing (4) comprehensive information services Network classification · coverage area: LAN, city wan, wan, Internet LAN: Local Area Network, short for LAN Metropolitan Area Network: the Metropolitan Area Network WAN: Wide Area Network (WAN) Topological structure: (network topology refers to the physical connection between nodes in the network) the total line, ring, star (tree shape), mixed form: Several key indicators of data communication The rate of data transmission This is the number of bits of binary code that can be transferred per second, in bits per second (bit/s or bit per second, abbreviated as BPS). The transmission rate for modems is increasing from the early 300bps to the current 28.8 Kbps, 33.6 Kbps and 56Kbps, faster and faster. B. ber It is a meas