tyt08fi.htm

一个学习tcp/ip协议的教程

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<Ctrl+T>

$</FONT></PRE><P>In this example, a connection to port 7 starts an Echo session. Everything typed by the user is echoed back immediately, unchanged. Then a connection to port 13 provides the Daytime service, showing the current date and time. The connection is broken by the service once the data is sent. Finally, the Character Generator is started. Both the Echo and Character Generator services were terminated with the Telnet break sequence of Ctrl+T.<BR><BR><A ID=E68E81 NAME=E68E81></A><H3 ALIGN=CENTER><CENTER><FONT SIZE=5 COLOR=#FF0000><B>Summary</B></FONT></CENTER></H3><BR><P>I covered a lot of material in this chapter, mostly about the way TCP/IP can interact with other networking systems and protocols. By combining TCP/IP with existing networks, the advantages of both can be gained, as well as offering compatibility with a wide range of TCP-based devices.<BR><P>I have also looked at several protocols that round out the TCP/IP family. These are mostly basic services, but they are essential to the proper operation of a TCP/IP-based network.<BR><BR><A ID=E68E82 NAME=E68E82></A><H3 ALIGN=CENTER><CENTER><FONT SIZE=5 COLOR=#FF0000><B>Q&amp;A</B></FONT></CENTER></H3><BR><P><B>What is the role of the Media Access Control (MAC) layer in a network </B><B>architecture?</B><BR><P>The MAC layer handles traffic for the network, including collisions and timers. The MAC is independent of the network's physical medium, but its exact role and implementation depend on the network protocols.<BR><P><B>What is the difference between LLC Type 1 and LLC Type 2?</B><BR><P>Logical Link Control (LLC) Type 1 is a simpler form that supports unnumbered information, designed for TCP. LLC Type 2 is for UDP and offers message integrity functionality.<BR><P><B>What is XNS?</B><BR><P>XNS is the Xerox Network System, a networking design that Xerox released to the public domain. Because XNS is essentially free, it has gained a lot of support. XNS supports Ethernet.<BR><P><B>What is ISDN?</B><BR><P>The Integrated Services Digital Network is a packet-switched high-speed network that supports broadband (many channel) communications.<BR><P><B>Why is a simple network protocol like the Character Generator supported?</B><BR><P>As simple as it may be, the Character Generator protocol (and many others like it) is used for basic tasks and queries that would require much more complex coding and operations when performed as part of a larger protocol. The Character Generator protocol is useful for testing communications. It is small, fast, easy to implement, and easy to understand.<BR><BR><A ID=E68E83 NAME=E68E83></A><H3 ALIGN=CENTER><CENTER><FONT SIZE=5 COLOR=#FF0000><B>Quiz</B></FONT></CENTER></H3><BR><OL><LI>What components make up a Medium Attachment Unit (MAU) and what are their roles?<BR></LI><BR><LI>What is FDDI? Why is it popular?<BR></LI><BR><LI>What is the role of the Discard service?<BR></LI><BR><LI>The Time protocol is often used by network devices. What is its role?<BR></LI><BR><LI>Does the presence of a second network protocol (like IPX) affect the basic TCP/IP protocol suite's operations?<BR></LI><BR></OL><P><P ALIGN=CENTER><A HREF=tyt07fi.htm TARGET=_self><IMG SRC=blanprev.gif WIDTH = 37 HEIGHT = 37 BORDER = 0 ALT="Previous Page"></A>
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