00303nam a2200109Ia 4500008004100000041000800041082001500049100002000064245004700084260005400131300000800185231228s2007    xx            000 0 und d  aeng  a5.711bGUP  aGUPTA (Prakash)  aData Communication and Computer Networking  aNew DelhibPrentice Hall of India New Delhic2007  a800