MAC Protocols: a Taxonomy Three broad classes Channel Partitioning TDMA, FDMA, CDMA(in wireless) e Divide channel into smaller"pieces"(time slots, frequency, code) e Allocate piece to node for exclusive use o Random Access ALoHA, CSMA, CSMA/CD, CSMA/CA e Channel not divided, allow collisions e Recover"from collisions ●“ Taking turns" Polling, Token passing o Nodes take turns, but nodes with more to send can take longer turnsMAC Protocols: a Taxonomy Three broad classes:  Channel Partitioning TDMA, FDMA, CDMA (in wireless)  Divide channel into smaller “pieces” (time slots, frequency, code)  Allocate piece to node for exclusive use  Random Access ALOHA, CSMA, CSMA/CD, CSMA/CA  Channel not divided, allow collisions  “Recover” from collisions  “Taking turns” Polling, Token passing  Nodes take turns, but nodes with more to send can take longer turns 5: DataLink Layer 5-14