Briefly explain how CSMA/CD works. Explain the 5-4-3 rule of networking. Within an Ethernet frame, describe the Frame Check Sequence (FCS) field and explain how it is used to make the header. Within an Ethernet frame, describe what happens if fewer than 46 bytes of data are supplied by the higher layers. Briefly describe the Ethernet sub-network access protocol (SNAP) frame type. Include an explanation of the drawback that keeps it from being implemented on networks instead of Ethernet_II frames.