单项选择题 WhichCiscoPIXandASAfeatureprovidesreliable，comprehensivesecurityagainstvirusandwormpropagation，aswellasdatatheft？（）

单项选择题 WhenconfiguringtheCiscoVPNClient，whatactionisrequiredpriortoinstallingMutualGroupAuthentication？（）

单项选择题 YouarethenetworkadministratorofanenterprisecompanythatjustdeployedaglobalIPtelephonyenvironment.Inordertoguaranteegoodvoicequality，youaskedyourprovidertoimplementQoSontheCEroutersofyourMPLSnetwork.OnyourLAN，youhavealsodeployedQoS.Users，however，keepcomplainingaboutbadvoicequality，andtheproviderdoesnotseematchesontheDSCPvaluesthatyouhaveaskedhimtomatchupon.Whatismostlikelytheproblem？（）A.ThephonesarenotsendingtrafficwiththecorrectDSCPvalue.B.TheCiscoCallManagerisnotmarkingthetrafficcorrectly.C.ThisismostlikelyabugontheCErouters.D.YourLANQoSisincorrectlyconfigured.