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<H2><A NAME="s2">2. Introduction</A></H2>
<P>This document will describe how you can build the network you want to
simulate in JNS. It is concerned with the static structure only, not with
dynamic things such as tracing or sending packets. Consequently, when
functions of several classes are described, those concerned with data
transfer are left out.
<P>
<P>The functions presented here are not recommended for "daily use". JNS was
designed with many options in mind, thus you have quite a bit of setup work
to do in order to build your network. If you want to just quickly build
a network without much customisation you are strongly advised to write some
code that will take away most details (For examples, a node together with an
interface could be built automatically and returned).
<P>
<P>Again, this file describes how to build a network from the basic building
blocks:
<UL>
<LI>Nodes - think of this as computers. The box on your desk or under your
desk.</LI>
<LI>Interfaces - the equivalent of network cards, modems, you name it.</LI>
<LI>Links - the cable that runs out of your network card into the next
one, your phone-line, etc.. Note, however, that links are between two
interfaces, not like an Ethernet cable that can connect more than two
computers.</LI>
</UL>
<P>
<P>Each of these will be described in detail in the next sections. Nearly all
of them can be attached to each other. As a reminder from here on, JNS has
a uniform naming scheme for attaching elements to others, the function to
do this is always called <CODE>'attach'</CODE>, regardless of what is attached
to what.
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