TestOut LabSim A+ Certification Practice Exam

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An 8-port switch receives a frame on port number 1. The frame is addressed to an unknown device. What will the switch do?

  1. Drop the frame

  2. Send the frame out port 1 only

  3. Send the frame out ports 2-8

  4. Store the frame for future transmission

The correct answer is: Send the frame out ports 2-8

When an 8-port switch receives a frame addressed to an unknown device, it will utilize a process known as flooding. Since the destination of the frame is not known (the switch does not have the MAC address in its MAC address table), the switch will broadcast the frame out to all other ports – in this case, ports 2 through 8. This ensures that the frame has the opportunity to reach its intended recipient, even if that recipient is connected to any of the other ports. This behavior is fundamental to how network switches operate; they learn the MAC addresses of devices on their network as frames are received, gradually building an address table. However, for any addresses not yet learned, flooding is the method utilized to ensure connectivity. In summary, the switch sends the frame out through ports 2 to 8 to maximize the chance that it reaches the unknown device.

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