00447nam a2200169 a 450000500170000002000180001708200150003510000230005024500370007325000120011026000430012230000260016550000200019163000170021163000220022863000270025020251203111659.0  a9788131715369  a004.6bSTA  aStallings, William  aData and computer communications  a8th ed.  aNew DelhibPearson Prentice Hallc2009  axvi, 834p.c24cm.bPB  aincluding index  aData network  aComputer networks  aCommunication networks