00373nam a2200145Ia 450000100060000000800410000602000150004704000130006208200170007511000090009224500510010126000570015230000110020954600070022033436140417s9999    xx            000 0 und d  a0070616825  cPK-LaUMT  a 004.6bDAT-  aISRD  aData communication and computer networkscISRD  aNew Delhi,India:bTata McGraw-Hill Publishing,c2007  a340 p.  aEN