Cisco CCNA Exam: Frame Flooding Explained

Frame Flooding

Question

What occurs to frames during the process of frame flooding?

Answers

Explanations

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A. B. C. D.

C.

Frame flooding occurs when a switch does not have an entry in its MAC address table for a destination MAC address. In this case, the switch will flood the frame out of all ports, except for the port on which it received the frame.

Option A, "Frames are sent to all ports, including those that are assigned to other VLANs," is incorrect because a switch will only forward frames within the same VLAN.

Option B, "Frames are sent to every port on the switch that has a matching entry in MAC address table," is also incorrect. If the switch has an entry in its MAC address table for the destination MAC address, it will forward the frame only to the port associated with that MAC address.

Option C, "Frames are sent to every port on the switch in the same VLAN except from the originating port," is partially correct. The switch will flood the frame to all ports in the same VLAN except for the port on which it received the frame. This helps prevent the frame from being sent back to the device that originally sent it and causing a loop.

Option D, "Frames are sent to every port on the switch in the same VLAN," is incorrect because the switch will not flood the frame out of ports that do not belong to the same VLAN as the source device.

In conclusion, the correct answer is Option C: Frames are sent to every port on the switch in the same VLAN except from the originating port.