00433nam a2200169Ia 450000100060000000800410000602000180004704000130006508200180007810000200009624500680011625000080018426000310019230000110022354600070023465000220024127465140414s9999    xx            000 0 und d  a0-534-95054-x  cPK-LaUMT  a 004.6bSHA-U  aWilliam A. Shay  aUnderstanding data communications and networkscWilliam A. Shay  a2nd  aLondon,UK:bThomson,c1999  a711 p.  aEN  aComputer networks