In which case(s) does a link-layer switch broadcast a packet?
(Many answers may apply.)

Question

In which case(s) does a link-layer switch broadcast a packet? (Many answers may apply.)

Accepted Answer

When it receives a packet with destination MAC address D, and there is no entry for D in the switch's forwarding table.

Accepted Answer

When it receives a packet whose destination MAC address is the broadcast MAC address.

Answer

When it receives a packet with destination IP address X, and there is no IP prefix that matches X in the switch's forwarding table.

Answer

When it receives a packet whose destination IP address is the broadcast IP address of an IP subnet.

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