Question: When an Ethernet switch receives a frame with an unknown MAC address, it 1) sends the frame back to the originating node. 2) sends the

When an Ethernet switch receives a frame with an unknown MAC address, it

1) sends the frame back to the originating node.

2) sends the frame to all ports.

3) sends a broadcast message asking the unknown node to identify itself.

4) discards the frame as undeliverable.

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