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

While deploying a new switch，you accidently connect ports 3/12 and 3/18 together，creating a loop.STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead？（）

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？

单项选择题

You deployed new fibers in your network to replace copper spans that were too long. While reconnecting the network，you experienced network problems because you reconnected wrong fibers to wrong ports. What could you do to prevent this type of problem in the future，particularly when connecting and reconnecting fiber pairs？（）

A.Only use fiber in pairs.
B.Configure root guard on your switches.
C.Do not use fiber but use copper.
D.Configure UDLD to prevent one-way link conditions.