What action takes place when a frame entering a switch has a unicast destination MAC address that is not in the MAC address table?

Question:
What action takes place when a frame entering a switch has a unicast destination MAC address that is not in the MAC address table?

• The switch updates the refresh timer for the entry.
• The switch resets the refresh timer on all MAC address table entries.
• The switch replaces the old entry and uses the more current port.
• The switch will forward the frame out all ports except the incoming port.

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