互联网你必须要了解的基础知识(国外英文资料).docVIP

互联网你必须要了解的基础知识(国外英文资料) The three basic elements of the network: 1 protocol (what is the protocol, responsibilities and functions of network protocol at present what mainstream network interconnection agreement) The definition of network protocol: set standards or agreements established for data exchange in computer networks, and rules. For example, a computer network users and a mainframe operator communication terminal, due to the two data with different character set, so the operator input commands do not know each other. In order to communicate, each terminal will be the respective provisions of the characters from the set to transform the standard character set of characters, before entering the network, after reaching the destination terminal, and then transformed into the terminal character set character. Of course, for incompatible terminals, in addition to transform character set out. Other characteristics, such as display format, governor, row number, scroll mode also need to make corresponding transformation. A network protocol includes at least three elements: (grammar) used to specify information format; information data and control the format, encoding and signal level etc.. (semantic) to illustrate the communication between the two sides should do it; for coordination and error handling control information. (timing) (Shi Xu) defines when communicating, what about the first, after what the speed of speech etc.. For example, using the synchronous or asynchronous transmission transmission! Operation mode Between computers on the network and how to exchange information? As we speak a language, is also a kind of language between each computer on the network, this is the network protocol, [2] between different computers must use the same network protocol to communicate. Network protocol is all equipment (computers and network servers, switches, routers, firewall) between the set of communication rules, it defines the message format and the format of these mu