单选题What does a Layer 2 switch do if it receives a frame with a destination MAC address that is not found in its MAC address table?（）AThe frame is dropped.BThe frame is addressed with a broadcast MAC address and sent out all ports.CThe frame is sent out all ports except the receiving port.DAn ARP request is sent out all ports except the receiving port.EA destination unreachable message is sent back to the source address.FNone of the above.
单选题
What does a Layer 2 switch do if it receives a frame with a destination MAC address that is not found in its MAC address table?（）
A
The frame is dropped.
B
The frame is addressed with a broadcast MAC address and sent out all ports.
C
The frame is sent out all ports except the receiving port.
D
An ARP request is sent out all ports except the receiving port.
E
A destination unreachable message is sent back to the source address.
F
None of the above.
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