An Ethernet frame arrived at switch interface G0/1, but the destination MAC address is missing from the MAC address table. How does the switch process the frame?

ARP (Address Resolution Protocol) operates at Layer 3 to resolve IP addresses to MAC addresses and is initiated by a host or router, not by a Layer 2 switch encountering an unknown MAC address.

The destination MAC address of the frame itself is not updated by the switch to FFFF.FFFF.FFFF; that is a broadcast MAC address which frames can already use as a destination.

A switch typically does not drop unknown unicast frames or notify the sending host unless there's a specific security feature configured (like port security) or if the frame's destination is unreachable after flooding.

If a switch receives an Ethernet frame with a destination MAC address that is not found in its MAC address table (also known as a CAM table), the switch treats it as an unknown unicast frame and floods it out of all active interfaces, excluding the ingress port, in an attempt to reach the destination.