單項(xiàng)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.


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3.單項(xiàng)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