Distinguish between unicast, multicast, and broadcast MAC addresses and how switches handle frames addressed to each.

• A. Unicast MAC targets a single device; multicast MAC uses the least significant bit set to indicate multiple receivers; broadcast MAC FF:FF:FF:FF:FF:FF is delivered to all on the LAN; switches forward accordingly using MAC tables and multicast protocols.
• B. All three types are delivered identically.
• C. Broadcast MAC addresses are the same as unicast addresses.
• D. Switches do not use MAC addresses.

Answer: (D)