00345nam a2200133 a 450000500170000002000150001708200150003210000220004724500480006925000120011726000430012930000220017270000170019420251203110126.0  a047112365X  a004.6bFIT  aFitzgerald, Jerry  aBusiness data communications and networking  a5th ed.  aNew YorkbJohn Wiley & sons, Incc1996  axix,562p.c23 cm.  aDennis, Alan