text7_TCP_IP协议簇.ppt

Technical English munication Engineering
8/6/2017
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The TCP/IP Protocol Suite
Text 7
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Based on protocol research and development conducted on (关于) its experimental packet-work, , the . Department of Defense (DOD) has issued(发行) a set of military standards munications protocols. Although there are five of these protocols, the entire set is known by the names of two of them: transmission-control protocol (TCP) and protocol (IP). These protocols are in widespread
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use within the . munity. But what is more interesting is that they have steadily built up a following in mercial arena during a time when much attention has been focused on the international standards based on the open systems interconnection (OSI) model. There are hundreds of vendors that provide TCP/IP products, and these are the most widely available and most widely used set of munications protocols.
舞台、竞技场
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The TCP/IP architecture, like the OSI model, is layered. In the case of TCP/IP, four layers are involved: network access, , host-to-host, and process. This architecture pared with that of OSI in Figure . work-access layer contains the protocols that provide access to work, such as a local work (LAN). Protocols at this layer are between
流程管理
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munications node and an attached host. The TCP/IP suite does not include any unique protocols at this layer. Rather(不过), the protocol appropriate for(适于) a work ( . , , IEEE 802 , X. 25) is used.
The layer consists of the procedures required to allow data to traverse work between hosts. Thus, it must provide a routing(路由)
连接的
Institute of Electrical and Electronics Engineers : 美国电气与电子工程师协会
横穿、穿越
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