多项选择题
Which three port states are used by RSTP 802.1w？ （）
A.Listening B.Learning C.Forwarding D.Blocking E.Discarding F.Disabled
问答题 whatisRPF（ReversePathForwarding）？
单项选择题 Refer to the exhibit. In this network，R1 is configured not to perform autosummarization within EIGRP. What routes will R3 learn from R2 through EIGRP？（）
多项选择题 WhichthreeportstatesareusedbyRSTP802.1w？（）
