Answer: A: When a switch receives a frame with a destination MAC address that is not found in its MAC address table, the frame is replicated and sent to every active port on the switch except the source port. This process is known as "flooding." The switch does this in an attempt to reach the unknown destination, as it does not yet know which port leads to the destination device. Once a device responds, the switch can learn its MAC address and update its MAC address table, so that future frames can be sent directly to the correct port.
