Sometimes called BUM traffic - Broadcast, Unknown Unicast, Multicast. These forms of traffic are "flooded" out all ports except the port the packet was received on.
C is correct.
Whenever a switch receive a frame, it look f MAC address table for a matching entry and if not found ,switch will forward to (Flood) all the ports in the switch except the port that received.
Ref: Introduction to Networks Companion Guide (CCNAv7)
“Chapter 7
Ethernet Switching
…
The MAC Address Table
…
Find the Destination MAC Address
If the destination MAC address is a unicast address, the switch looks for a match between the destination MAC address of the frame and an entry in its MAC address table. If the destination MAC address is in the table, the switch forwards the frame out the specified port. If the destination MAC address is not in the table, the switch forwards the frame out all ports except the incoming port. This is called an unknown unicast.
…”
Answer is C. The Layer 2 switch floods packets to all ports except the receiving port in the given VLAN. When a Layer 2 switch receives a frame with an unknown destination MAC address, it will flood the frame to all ports in the same VLAN, except for the port from which the frame was received. This is done so that the destination device can receive the frame and respond with its MAC address.
Switches Flood traffic with unknown destination MAC Address out all ports apart from the one it received, They do not forward. They will only forward if the destination MAC Address is in the CAM Table.
So from the question the keyword is "UNKNOWN MAC ADDRESS" and Letter C has the Keyword "FLOOD" thus C is the correct answer
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