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4 组配网络协议:开系统相互连接(OSI)4.1 OSI 基准模型国际标准化组织(ISO)已建立了开系统相互连接(OSI)基准模型作为组配网络协议的一组指导原则。此基准模型的体系结构是由7层组成的,并强调同等层对同等层协议(见图1)。数据传输是在物理链接层中实际进行的,传输形式是行为流,这是一种1和0的连续流而别无他物。在物理链接层中,既没有字节边界,也没有文字边界。可以用多种方式配备局部地区网络的物理链接层,例如 RS-232
4 Group with Network Protocols: Open Systems Interconnection (OSI) 4.1 OSI Reference Model The International Organization for Standardization (ISO) has established an OSI baseline model as a set of guidelines for teaming network protocols. The architecture of this benchmark model is made up of seven layers and emphasizes peer-to-peer protocols (see Figure 1). Data transfer is actually carried out in the physical link layer, the form of transmission is the behavior of the flow, which is a continuous flow of 1 and 0 and nothing else. In the physical link layer, there is neither a byte boundary nor a word boundary. There are several ways to equip a physical link layer of a local area network, such as RS-232