00292nam a2200121Ia 4500008004100000041001200041082001100053100001200064245007000076260000600146650000600152700001200158221030s9999    xx            000 0 und d  aEnglish  a105.23  aM. Jain 0aData Communication and Networking Essentialscby M. Jain, S. Jain  c0  aB  aS. Jain