Question:
Which statement is correct about how a Layer 2 switch determines how to forward frames?
- Frame forwarding decisions are based on MAC address and port mappings in the CAM table.
- Only frames with a broadcast destination address are forwarded out all active switch ports.
- Unicast frames are always forwarded regardless of the destination MAC address.
- Cut-through frame forwarding ensures that invalid frames are always dropped.
Explanation: Cut-through frame forwarding reads up to only the first 22 bytes of a frame, which excludes the frame check sequence and thus invalid frames may be forwarded. In addition to broadcast frames, frames with a destination MAC address that is not in the CAM are also flooded out all active ports. Unicast frames are not always forwarded. Received frames with a destination MAC address that is associated with the switch port on which it is received are not forwarded because the destination exists on the network segment connected to that port.
Exam with this question: CCNA 2 v7 FINAL Exam Answers
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