What action takes place when a frame entering a switch has a unicast destination MAC address that is not in the MAC address table?
- The switch updates the refresh timer for the entry.
- The switch resets the refresh timer on all MAC address table entries.
- The switch replaces the old entry and uses the more current port.
- The switch will forward the frame out all ports except the incoming port.
Explanation: When a switch receives a frame with a unicast destination MAC address that is not in its MAC address table, it does not know which specific port to use for forwarding. Consequently, it treats the frame as an unknown unicast and floods it out of all available ports within the same VLAN, except for the ingress port (the port where the frame originally entered the switch). This process ensures the intended recipient receives the frame so the switch can later learn its location from the response.
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