多项选择题
Which three protocols should be explicitly managed by using a CoPP policy on an Internet border router？（）
A.SMTP B.ICMP C.BGP D.SSH E.RTP F.BitTorrent G.VTP
多项选择题 Whichtwomulticastaddressrangesareassignedassource-specificmulticastdestinationaddressesandarereservedforusebysource-specificapplicationsandprotocols？（）
