單項選擇題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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1.單項選擇題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.

4.單項選擇題What are the mandatory，well-known BGP attributes？（）

A.origin，AS-path，next-hop
B.AS-path，origin，MED
C.AS-path，origin，weight
D.AS-path，weight，MED