单项选择题

What keywords do you need to the access-list to provide to the logging message like source address and source mac address？（）

A.Log
B.Log-input
C.Log-output
D.Logging

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单项选择题

Whiledeployinganewswitch，youaccidentlyconnectports3 12and3 18together，creatingaloop.STPdetecteditandplacedport3 18inblockingmode.WhydidSTPnotplaceport3 12inblockingmodeinstead？（）

A.Port 3/12 was already up and forwarding before the loop was created.
B.Port priority is based on lowest priority and lowest port number.
C.You connected the wire on port 3/18 last.
D.None of the above， it is purely random.

问答题

第二条rate-limit的作用是什么？