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

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Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？（）

A. Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot
B. UDLD protects against STP failures caused by cabling problems that create one-way links.
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Refer to the exhibit. In the diagram，the switches are running IEEE 802.1w RSPT. On which ports should root guard be enabled in order to facilitate deterministic root bridge election under normal and failure scenarios？（）

A. GE-3/1， GE-3/2
B. FE-2/1， FE-3/2
C. GE-1/1， GE-1/2
D. GE-4/1， GE-4/2
E. GE-2/1， GE-2/2
F. GE-3/1， GE-3/2， GE-4/1， GE-4/2， FE-2/1， FE-3/2

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Spanning Tree Protocol calculates path cost based on which of these？ （）

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Spanning Tree Protocol calculates path cost based on which of these？（）