問答題r1 is the hub , multipoint mode subinterface, r2 and r3 is spoke, when r2 down at the spoke, What will r1 react?how about r3?

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1.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

5.單項選擇題If a port configured with STP loop guard stops receiving BPDUs, the port will be put into which state?()

A.learning state
B.listening state
C.forwarding state
D.root-inconsistent state