单项选择题
A.PIM sparse mode is being used.
B.PIM dense mode is being used.
C.The BGP multicast address family has not been configured.
D.IGMP version 3 is being used.
E.IP PIM neighbor filters have not been applied.
单项选择题 YouarethenetworkadministratorofanenterprisecompanythatjustdeployedaglobalIPtelephonyenvironment.Inordertoguaranteegoodvoicequality，youaskedyourprovidertoimplementQoSontheCEroutersofyourMPLSnetwork.OnyourLAN，youhavealsodeployedQoS.Users，however，keepcomplainingaboutbadvoicequality，andtheproviderdoesnotseematchesontheDSCPvaluesthatyouhaveaskedhimtomatchupon.Whatismostlikelytheproblem？（）
单项选择题 YouarethenetworkadministratorofaLayer3switchednetwork.UsersinoneVLANarecomplainingthataccesstotheserverVLANisveryslowfromtimetotime.TrafficinthelocalVLANworkswithoutanyissue，andusersinotherVLANsdonothaveanycomplainttoreachtheserverVLAN.Whatismostlikelythecauseofthisissue？（）
多项选择题 WhichthreeprotocolsshouldbeexplicitlymanagedbyusingControlPlanePolicingonanInternetborderrouter？（）