Which forwarding action does a switch take when the destination MAC address of an Ethernet frame is an unknown unicast?

Which forwarding action does a switch take when the destination MAC address of an Ethernet frame is an unknown unicast?

• The switch forwards the frame to the default gateway.
• The switch forwards the frame the same way it does for broadcast and multicast MAC addresses.
• The switch drops the frame.
• The switch forwards the frame out a specified port for this type of address.

Explanation: If the destination MAC address is a unicast address, the switch will look for a match between the destination MAC address of the frame and an entry in its MAC address table:

• If the destination MAC address is in the table, it will forward the frame out of the specified port.
• If the destination MAC address is not in the table (unknown unicast), the switch will forward the frame out all ports except the incoming port. If the destination MAC address is a broadcast or a multicast, the frame is also flooded out all ports except the incoming port.

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