00331nam a2200121 a 450000500170000002000150001708200190003210000180005124500600006925000110012926000440014030000250018420251203110657.0  a8120310411  a001.64404bBLA  aBlack, Uyless  aComputer NetworksbProtocols, Standards, and Interfaces  a2nd ed  aNew DelhibPrentice-Hall of Indiac2005  axii,436p.c24 cm. PB