About 802.3 Ethernet, hubs and switches 1) Early 10Mbps 802.3 Ethernet is 1-Persistant CSMA/CD (CSMA:Carrier Sense Multiple Access, CD: Collision Detection). Briefly explain how 1-Persistant CSMA/CD functions. 2) Briefly explain how an 802.3 Ethernet hub that supports spanning trees operate? 3) Briefly explain how the receiver MAC layer acknowledges a MAC frame sent by the sender MAC layer