What does a host on an Ethernet network do when it is creating a frame and it does not have the destination address?

What does a host on an Ethernet network do when it is creating a frame and it does not have the destination address?
A . drops the frame
B . sends out a Layer 3 broadcast message
C . sends a message to the router requesting the address
D . sends out an ARP request with the destination IP address

Answer: D

Explanation:

Understanding this concept is prime for understanding that when switch receives the data frame from the host not having the MAC address already in the MAC table, it will add the MAC address to the source port on the MAC address table and sends the data frame. If the switch already has the MAC address in it’s table for the destination, it will forward the frame directly to the destination port. If it was not already in it’s MAC table, then they frame would have been flooded out all ports except for the port that it came from.