00330nam a2200121Ia 4500008004100000040001700041041001200058082001700070100002100087245004500108260004300153300001200196230917s9999||||xx |||||||||||||| ||und||  e138538aMAIN  aEnglish  a004.64 B769D  aBrijendra Singh. 0aData Communication and computer networks  aNew DelhibPrentic-hall of Indiac2004  a303p p.