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News over Networks with Limited Bandwidth

  Another problem arising with the Usenet's steady growth is the provision of a full news feed to a news server being connected by a low bandwidth link (e.g., a modem line or ISDN). The required bandwidth for a full news feed currently is about $400\mbox{KBit}/\mbox{s}$% latex2html id marker 4065 \setcounter{footnote}{2}\fnsymbol{footnote} for 24 hours a day. This requirement makes it impossible to provide news to a large number of people over a low bandwidth network. A cache server has to be used in this situation to reduce the network traffic caused by repeatedly requested articles. This setup is shown in figure 3.5.


  
Abbildung 3.5: Using a News Cache
\begin{figure} \begin{center} \leavevmode \epsfig {file=eps/newscacheserver.eps} \end{center}\end{figure}


gschwind@infosys.tuwien.ac.at