00494nam a2200193 a 450000500170000002000150001708200150003210000230004724500510007025000120012126000440013330000260017750000190020360000080022263000360023063000220026685600060028885600060029420251203114825.0  a8120309251  a004.6bBLA  aBlack, Uyless Dd_  aData commnications and distributed networksb_  a3rd ed.  aNew DelhibPrentice-Hall of Indiac2007  axvi, 422p.c36cm.bPB  aIncludes index  bc_  aComputer communication networks  aComputer networks  f_  a_