单项选择题
A.MPLS Traffic Engineering
B.Dynamic access-lists
C.Authentication
D.Receive ACL
E.Unicast RPF
单项选择题 InwhichstatecanBGPpeersexchangeUpdatemessages？（）
单项选择题 InPIM-SMoperations，thefirstrouterconnectedtothemulticastsourcesendstheRegistermessagetowhichdevice？（）
单项选择题 TypicalADSLbroadbandInternetaccessrequiresausernameandpasswordtobeenteredonend-userPCconnectedtotheADSLmodeminorderfortheendusertogainaccesstotheInternet.ifaCiscoADSLrouterisusedinsteadofanADSLmodem，whatfunctionalityisrequiredontheCiscoADSLroutersotheend-userconnectedtotheCiscoADSLroutercanaccesstheInternetwithoutenteringausernameandpassword？（）