00305nam a2200121 a 450000500170000002000150001708200230003210000230005524500410007825000120011926000300013130000220016120251203091849.0  a0024154652  a001.64404,bD, sta  aStallings, William  aLocal and metropolitan area networks  a4th ed.  aNew YorkbMacmillanc1993  axviii, 552p, 22cm