题目内容

提升机电控系统在检修方式下运行，其最大速度不得超过（）。

A. 3m/s
B. 1m/s
C. 1.5m/s
D. 2m/

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Why would an administrator change the value of the spanning-tree priority of a switch?（）

A. in order to optimize the path that frames take from source to destination
B. to increase the priority so a designated port will become a root port
C. to increase the BID, so the switch is more likely to become root bridge
D. in order to allow VLANs to be sent from one switch to another across a single link
E. to force a given switch to become an STP server

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