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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><link rel="STYLESHEET" type="text/css" href="wrs.css"><title> TCP/IP Under VxWorks </title></head><body bgcolor="FFFFFF"><p class="navbar" align="right"><a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a><a href="c-tcpip.html"><img border="0" alt="[Index]" src="icons/index.gif"></a><a href="c-tcpip.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-tcpip3.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-tcpip5.html"><img border="0" alt="[Next]" src="icons/next.gif"></a></p><font face="Helvetica, sans-serif" class="sans"><h3 class="H2"><i><a name="86812">4.4 UDP, User Datagram Protocol</a></i></h3></font><dl class="margin"><dl class="margin"><dd><p class="Body"><a name="86814"> </a>The User Datagram Protocol (UDP), part of the TCP/IP suite, provides a simple <i class="term">datagram</i>-based process-to-process communication mechanism. UDP extends the message address to include a <i class="term">port address</i> in addition to the host Internet address. The port address identifies one of several distinct destinations within a single host. Thus UDP accepts messages addressed to a particular port on a particular host, and tries to deliver them, using IP to transport the messages between the hosts. Like IP, UDP makes no guarantees that messages are delivered correctly or even delivered at all. </p><dd><p class="Body"><a name="86816"> </a>However, it is this relatively low-overhead process-to-process delivery mechanism that makes UDP so useful to many other protocols and utilities, such as BOOTP, DHCP, DNS, RIP, SNMP, and NFS. </p></dl></dl><a name="foot"><hr></a><p class="navbar" align="right"><a href="index.html"><img border="0" alt="[Contents]" src="icons/contents.gif"></a><a href="c-tcpip.html"><img border="0" alt="[Index]" src="icons/index.gif"></a><a href="c-tcpip.html"><img border="0" alt="[Top]" src="icons/top.gif"></a><a href="c-tcpip3.html"><img border="0" alt="[Prev]" src="icons/prev.gif"></a><a href="c-tcpip5.html"><img border="0" alt="[Next]" src="icons/next.gif"></a></p></body></html><!---by WRS Documentation (), Wind River Systems, Inc. conversion tool: Quadralay WebWorks Publisher 4.0.11 template: CSS Template, Jan 1998 - Jefro --->⌨️ 快捷键说明
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