Your boss at TestKing asks you about half-duplex and full-duplex Ethernet. What are unique for halfduplex   Ethernet? (Choose two)   
A. Half-duplex Ethernet operates in a shared collision domain.   
B. Half-duplex Ethernet operates in a private collision domain.   
C. Half-duplex Ethernet has higher effective throughput.   
D. Half-duplex Ethernet has lower effective throughput.   
E. Half-duplex Ethernet operates in a private broadcast domain.    

Answer: A D   
Explanation:   
A single device could not be sending a frame and receiving a frame at the same time because it would mean that a collision was occurring. So, devices simply chose not to send a frame while receiving a frame. That logic is  called half-duplex logic.   
Ethernet switches allow multiple frames to be sent over different ports at the same time. Additionally, if only  one device is connected to a switch port, there is never a possibility that a collision could occur. So, LAN  switches with only one device cabled to each port of the switch allow the use of full-duplex operation. Full   
duplex means that an Ethernet card can send and receive concurrently.