- A complex hierarchy which exists in protocol usage. At the lowest level is the synchronous communications protocol governing the exchange of information between switching computers. Next, the socalled firstlevel protocols control the exchange of information between a host computer and its interface. Using these two protocols in its implementation is the leveltwo protocol controlling the exchange of information between host computers. Levelthree protocols control the information exchange between actual processes where a process may be a computer program or a user terminal. At this level are the protocols that are very relevant to the user in relation to the utility of the network.; 在协议使用中存在的一种复杂分层结构。在最低级是同步通讯协议,它管理计算机之间的信息交 换。其上一级是控制主机与其接口之间的信息交换的所谓第一级协议。利用这两级协议 的实现是控制主机之间信息交换的两协级议。三级协议控制实际进程之间的信息交换, 在这里,一个进程可以是计算机程序或者是一个用户终端,在这一级,协议与涉及网络应用 的用户密切相关。
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