Networksecurityconsistsofpoliciesandpracticestopreventandmonitor(请作答此空)access,misuse,modification,ordenialofacomputernetworkandnetwork-accessibleresources.Networksecurityinvolvestheauthorizationofaccesstodatainanetwork,whichiscontrolledbythenetwork().UserschooseorareassignedanIDandpasswordorotherauthenticatinginformationthatallowsthemtoaccesstoinformationandprogramswithintheirauthority.Networksecuritysecuresthenetwork,aswellasprotectingandoverseeingoperationsbeingdone.Themostcommonandsimplewayofprotectinganetworkresourceisbyassigningita()nameandacorrespondingpassword.Networksecuritystartswithauthentication.Onceauthenticateda()enforcespoliciessuchaswhatservicesareallowedtobeaccessedbythenetworkusers.Thougheffectivetopreventunauthorizedaccess,thiscomponentmayfailtocheckpotentiallyharmfulcontentsuchascomputer()orTrojansbeingtransmittedoverthenetwork
A.unauthorized B.harmful C.dangerous D.frequent正确答案A
