問答題what is RPF（ Reverse Path Forwarding ）？

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1.單項選擇題

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

2.多項選擇題Which three port states are used by RSTP 802.1w？（）

A.Listening
B.Learning
C.Forwarding
D.Blocking
E.Discarding
F.Disabled

4.單項選擇題The classic Spanning Tree Protocol （802.1D  1998） uses which sequence of variables to determine the best received BPDU？（）

A.lowest root bridge id；lowest sender bridge id；lowest port id；lowest root path cost
B.lowest root path cost；lowest root bridge id；lowest sender bridge id；lowest sender port id
C.lowest root bridge id；lowest sender bridge id；lowest root path cost；lowest sender port id
D.lowest root bridge id；lowest root path cost；lowest sender bridge id；lowest sender port id