Which statement is correct about Ethernet switch frame forwarding decisions?Frame forwarding decisions are based on MAC address and port mappings in the CAM table.Cut-through frame forwarding ensures that invalid frames are always dropped.Unicast frames are always forwarded regardless of the destination MAC address.Only frames with a broadcast destination address are forwarded out all active switch ports.
Question
Which statement is correct about Ethernet switch frame forwarding decisions?Frame forwarding decisions are based on MAC address and port mappings in the CAM table.Cut-through frame forwarding ensures that invalid frames are always dropped.Unicast frames are always forwarded regardless of the destination MAC address.Only frames with a broadcast destination address are forwarded out all active switch ports.
Solution
The correct statement about Ethernet switch frame forwarding decisions is: "Frame forwarding decisions are based on MAC address and port mappings in the CAM table."
Here's why:
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Ethernet switches use a Content Addressable Memory (CAM) table that stores MAC addresses and their corresponding ports. When a frame arrives, the switch checks the destination MAC address in the CAM table to decide which port to forward the frame to.
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Cut-through frame forwarding does not ensure that invalid frames are always dropped. In cut-through mode, the switch starts forwarding the frame as soon as it reads the destination address, without checking for errors in the entire frame.
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Unicast frames are not always forwarded regardless of the destination MAC address. They are forwarded only to the port associated with the destination MAC address in the CAM table.
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Only frames with a broadcast destination address are not forwarded out all active switch ports. Broadcast frames are indeed forwarded out all active ports, but so are multicast frames and unknown unicast frames (when the destination MAC address is not in the CAM table).
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