what is RPF（ Reverse Path Forwarding ）？

【参考答案】

Forwarding multicast traffic away f......

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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？（）

A.172.30.1.0/24 and 10.1.2.0/24；EIGRP only performs autosummarization at the edge between two major networks
B.172.30.0.0/16 and 10.1.2.0/24；R2 will perform autosummarization，although R1 will not
C.Since R2 is configured without autosummarization，it will not propagate the 172.30.1.0/24 route
D.172.30.0.0/8 and 10.0.0.0/8
多项选择题
WhichthreeportstatesareusedbyRSTP802.1w？（）

A.Listening
B.Learning
C.Forwarding
D.Blocking
E.Discarding
F.Disabled
问答题
r1isthehub，multipointmodesubinterface，r2andr3isspoke，whenr2downatthespoke，Whatwillr1react？howaboutr3？