Summary of mac protocols o What do you do with a shared media? e Channel Partitioning, by time, frequency or code Time Division, Frequency Division o Random partitioning dynamic), ALOHA, S-ALOHA, CSMA, CSMA/CD Carrier sensing: easy in some technologies (wire), hard in others (wireless) CSMA/CD used in Ethernet ◆CSMA/ CA used in80211 ● Taking turns Polling from a central site, token passing 32579 5: DatSummary of MAC Protocols  What do you do with a shared media?  Channel Partitioning, by time, frequency or code  Time Division, Frequency Division  Random partitioning (dynamic),  ALOHA, S-ALOHA, CSMA, CSMA/CD  Carrier sensing: easy in some technologies (wire), hard in others (wireless)  CSMA/CD used in Ethernet  CSMA/CA used in 802.11  Taking Turns  Polling from a central site, token passing 5: DataLink Layer 5-25