What action does a switch take if the destination MAC address is unknown?

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answerhappygod
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What action does a switch take if the destination MAC address is unknown?

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What action does a switch take if the destination MAC address is unknown?

A. Discard frame
B. Send ICMP unreachable message to source
C. Flood packet on all ports
D. Compare destination IP address against an ACL to determine if it is permitted
E. Send gratuitous ARP on all ports and wait for reply before forwarding
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