44 lines
1.7 KiB
HTML
44 lines
1.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
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<!--Converted with LaTeX2HTML 96.1-c (Feb 29, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds -->
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<HTML>
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<HEAD>
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<TITLE>IP Networks</TITLE>
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</HEAD>
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<BODY LANG="EN">
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<A HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <BR>
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<B> Next:</B> <A HREF="node29.html">Subnetworks</A>
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<B>Up:</B> <A HREF="node27.html">IP Routing</A>
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<B> Previous:</B> <A HREF="node27.html">IP Routing</A>
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<BR> <P>
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<H2><A NAME="SECTION004410000">IP Networks</A></H2>
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When you write a letter to someone, you usually put a complete address
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on the envelope, specifying the country, state, zip code, etc. After
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you put it into the letter box, the postal service will deliver it to
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its destination: it will be sent to the country indicated, whose national
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service will dispatch it to the proper state and region, etc. The
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advantage of this hierarchical scheme is rather obvious: Wherever you
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post the letter, the local postmaster will know roughly the direction to
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forward the letter to, but doesn't have to care which way the letter
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will travel by within the destination country.
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<P>
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IP-networks are structured in a similar way. The whole Internet
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consists of a number of proper networks, called <em>autonomous systems</em>.
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Each such system performs any routing between its member hosts
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internally, so that the task of delivering a datagram is reduced to finding
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a path to the destination host's network. This means, as soon as the datagram
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is handed to <em>any</em> host that is on that particular network, further
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processing is done exclusively by the network itself.
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<HR>
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<ADDRESS>
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<I>Andrew Anderson <BR>
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Thu Mar 7 23:22:06 EST 1996</I>
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</ADDRESS>
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</BODY>
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</HTML>
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