多项选择题
Which two commands are required to enable multicast on a router， knowing that the receivers only supports IGMPv2？（）
A.IP PIM RP-address B.IP PIM ssm C.IP PIM Sparse-mode D.IP PIM Passive
多项选择题 WhichthreeprotocolsshouldbeexplicitlymanagedbyusingaCoPPpolicyonanInternetborder router？（）
多项选择题 Whichtwomulticastaddressrangesareassignedassource-specificmulticastdestinationaddressesandarereservedforusebysource-specificapplicationsandprotocols？（）
