00318nam a2200121 a 450000500170000002000150001708200150003210000210004724500450006825000120011326000440012530000270016920251203110919.0  a8120329694  a004.6bSIN  aSingh, Brijendra  aData communication and computer networks  a2nd Ed.  aNew DelhibPrentice-Hall of Indiac2006  axivc357p.c24 cm.cPB