00360nam a2200133 a 450000500170000002000150001708200160003210000180004824500590006625000120012526000440013730000260018150000190020720251203110536.0  a8120310411  a004.62bBLA  aBlack, Uyless  aComputer Networksbprotocols, standards and interfaces  a2nd ed.  aNew DelhibPrentice Hall of Indiac1993  axii,436p.c24 cm.bPB  aincludes index