In the Junos OS, what is the default behavior of a switch when it receives a frame with an unknown destination MAC address?

In the Junos OS, what is the default behavior of a switch when it receives a frame with an unknown destination MAC address?
A . It discards the frame.
B . It floods the frame out of all ports except the one it was received on.
C . It sends the frame to its default gateway.
D . It buffers the frame until the MAC address can be learned.

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Answer: B