單項選擇題

Refer to the exhibit. In the diagram, the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state?（）

A.GE-1/2 and GE 2/1
B.GE-1/1 and GE-2/2
C.GE-3/2 and GE 4/1
D.no ports are in the blocking state
E.There is not enough information to determine which ports are in the blocking state


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1.多項選擇題What two features in Cisco switches help prevent Layer 2 loops？（）

A.UniDirectional Link Detection
B.Hot Standby Router Protocol
C.Virtual Router Redundancy Protocol
D.PortFast
E.root guard
F.loop guard

3.單項選擇題Spanning Tree Protocol calculates path cost based on which of these？（）

A.interface bandwidth
B.interface delay
C.interface bandwidth and delay
D.hop count
E.bridge priority