Refer to the exhibit. The entire Marketing-SW1 MAC address table is shown here: What does the switch do when PC-4 sends a frame to PC-1?

The switch would not discard the frame because PC-1, the destination, is present in the MAC address table, and it always learns the source MAC, even if the destination is initially unknown.

Switches operate at Layer 2 and forward frames based on MAC addresses. They do not map Layer 2 MAC addresses to Layer 3 IP addresses for forwarding decisions.

When Marketing-SW1 receives a frame from PC-4 (whose MAC address is not currently in the table), it first learns PC-4's MAC address and the interface it arrived on, inserting this information into its MAC address table. The switch then looks up the destination MAC address, PC-1, finds it associated with port Fa0/1, and forwards the frame directly out of Fa0/1 to PC-1.

The switch will not flood the frame because the destination MAC address for PC-1 is known in its MAC address table, allowing for direct unicast forwarding. Flooding only occurs for unknown unicast, broadcast, or multicast traffic.