00369nam a2200157Ia 4500008004100000020001800041035001000059082001800069100001800087245003800105250000600143260002400149300000800173500000900181650002100190210723s9999||||xx |||||||||||||| ||und||  a81-7635-319-1  a21450  a510.7834BHEL  aHeld, Gilbert 0aUnderstanding Data Communications  a-  aN. DelhibTechmedia  a619  a7991  aComputer Science