"QrßàáB>0¢\r"íî"âã\nïðªññª*#\òk6ó£°"\rã!"st!"ôõ$Lö*÷ø!"ùúû,-.\r/0:üW!"!"ý#zþÿ 0@P`p?\r?? \r?? @P\n@P!"#$?%&'@P`(\r@P)*+,\r-39-EvaluationWarning:ThedocumentwascreatedwithSpire.PDFfor.NET.\r./0123456789:\rfghi\r[1];<=?>?@?AB.JSPCD01EFG.IJKLM0NOPQ,2005\rK2]RST?UVW,YZS.[\WEB]^?_`abcd?efg3h[J].LMij\rk``l,2001,301:P72-76\r[3]mno?pqr.stuv7CwxP:.IJKyzk`OPQ?2005\r[4]{|}~.C1ef7P:.IJ:yzk`?1999\r[5].f
.IJ:Lk`,2002\r[6]?.f
j.IJ:i`OPQ,2001\r[7]=,.f
.IJ:yzk`OPQ,2002\r[8]?.Vf
1jIJK?OPQ?2002\r[9]<?.Vf
¡¢.IJ:?OPQ?1996\r[10]AndrewSTanenbaum.ComputerNetworksThirdEdition.Prentice-HallInc.,1998\r[11]WestNetLearningTechologies.IntroductiontoTCP/IP&Networking\rArchiectures.O'Reilly&AssociatesInc.,1999\r-40-