00274nam a2200121Ia 4500008004100000020001800041082000800059100001500067245003600082250000800118260001800126300000800144160921s9999    xx            000 0 und d  a81-297-0330-0  a641  aCOMER  D E  aCOMPUTER NETWORKS and internets  a4th  bPEARSONc2005  a719