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1、清理BIOS垃圾，提高系统启动速度Ifthereareanyunknownplacesorunfamiliarports,youcanfindthemhere・TocheckifthesystemisinfectedwithavirusoraTrojan.Butinthecaseofafirewall,firewallisstrictlyauditprogramofnetworkconnection,soitwillbeclosedalltheportsinadvance,ifyouneedtoaccessthenetworkapplicationwilla
2、pplytothefirewall,thefirewalltorespond,andpopups,requiretheusertomakeachoice,we'regoingtolookcarefullyatthistime,whichisaprogramthatinthefolderwhichoneposition,todoaestimate,strangeprogramtocheck.Thatway,youdon'tgivethemaliciousprogramanyleeway.Atthesametime,thesystemwillbeautomati
3、callyupgraded,oritwillbeavailableonaregularbasistoWindows'sMicrosoftwebsite,whichwillbeverygoodforsystemsecurity.Systemvulnerabilitiesmayallowmaliciousprogramstobypassthefirewalltoconnecttothenetworkthroughasystemvulnerability・Thefollowingportswillonlybeusedforresearchpurposes(ther
4、ewillbeaguaranteewhenthefirewallisinplace)Port:1.Service:tcpmuxNote:thisshowsthatsomeoneislookingforthesgiirixmachine.Irixistheprimaryproviderforimplementingtcpmux,whichisopeneclbydefaultfortcpmux・Theirixmachineispublishedwithseveraldefaultunencryptedaccounts,suchasIP,guestuucp,nuu
5、cp,demos,tutor,diag,outofbox,etc・Manyadministratorsforgettodeletetheseaccountsafterinstallation.SohackersearchestheInternetfortcpmuxandUSEStheseaccounts.Port:7Service:echoNote:youcanseealotofpeoplesearchingforthefraggleamplifier,sendingittox.x.x・x.x・x.x.255・Port:19Service:thecharac
6、terofthegeneratorNote:thisisaservicethatonlysendscharacters・Theudpversionwillrespondtoapackagecontaining**charactersafterreceivingtheudppackage・TheTCPconnectionsendsthedatastreamcontainingthe**characteruntiltheconnectionisclosed・HackerUSESIPspoofingtolaunchDOSattacks.Forgeaudppacka
7、gebetweentwochargenservers.AlsofraggleDOSattacksapacketwithafakevictimIPonthisportofthetargetaddress,andthevictimisoverloadedtorespondtothedata・Port:21Service:FTPNote:theportthattheFTPserverisopenforuploadinganddownloading・Themostcommonattackersareusedtofindwaystoopenanonymous'sFTP
8、server・Theseservershaveare
