00297nam a2200109Ia 4500008004100000082002100041100002200062245003700084250001200121260004400133300001000177240913s9999||||xx |||||||||||||| ||und||  aRACK004.6  STA/D  aWilliam Stallings 0aData and Computer Communications  a9th Ed.  bPearson Education AsiaaNew Delhic2014  a798 p