用戶數據報協議(UDP)

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中文翻譯
    用戶數據報協議(UDP)(中文3000字,英文2000字)
    UDP是位于IP上層的兩個主要協議之一.它服務于用戶的網絡應用程序.諸如網絡文件系統(NFS)和簡單網絡管理協議(SNMP)都是使用UDP的網絡應用程序.這些服務只不過是與IP的一個接口.UDP是一種無連接的數據報傳輸服務,不保證傳輸的可靠性.UDP不與遠端的UDP模塊保持端對端的連接;它僅僅是把數據報發向網絡,并從網絡接收傳來的數據報.數據報在傳給IP之前被UDP加上了兩個值.一個是基于端口的應用程序間的多路信息,另一個是校驗和以保證數據的完整性.
端口
 
外文原文
 UDP is one of the two main protocols to reside on top of IP.  It offers service to the user's network applications.  
 Network  applications that use UDP are:  Network File System (NFS) and Simple etwork Management Protocol (SNMP).  The service is little more than an interface to IP.
UDP is a connectionless datagram delivery service that does not guarantee delivery.  UDP does not maintain an end-to-end connection  with the remote UDP module; it merely pushes the datagram out on the  net and accepts incoming datagrams off the net.
UDP adds two values to what is provided by IP.  One is the multiplexing of information between applications based on port number. The other is a checksum to check the integrity of the data.
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