00442nam a2200157Ia 4500008004100000020001500041082001400056100001800070245003900088250000800127260004200135300002900177500000700206600002100213650005000234240925s9999    xx            000 0 und d  a8129702118  a004.6 HEL  aHeld, Gilbert 0aUnderstanding Data Communications   a7th  aSingapore:bPearson educationc,2003.  axxxiv,973p.bNAfPirated  aNA  aComputer Science  aComputer science, information & general works