Which three statements describe what happens when processing a frame for a switched packet? (Choose three.)
Which three statements describe what happens when processing a frame for a switched packet? (Choose three.)
When processing a frame for a switched packet, the ingress Packet Forwarding Engine (PFE) performs the MAC address lookup. The frame enters the ingress port and is processed by the ingress PFE. Finally, the egress PFE forwards the packet out the egress port towards the destination. These steps ensure efficient switching by enabling the packet to be appropriately directed without unnecessary broadcast or routing engine involvement for standard frames.
A : Ingress PFE performs a MAC address lookup and determines source MAC is unknown. C : Frame enters ingress port and attached ingress PFE. C : Frame enters ingress port and attached ingress PFE. D: Ingress PFE sends header information to RE, where MAC is added or discarded (MAC limiting).
The PFE can switch without involvement of the RE. Only exception / local or control traffic is forwarded to the RE. So for normal switching, there is no need to send a header of a frame to the RE. That's why D is not a correct answer.