Random Access protocols w When node has packet to send k transmit at full channel data rate No a priori coordination among nodes * Two or more transmitting nodes“ collision” Random access MAC protocol specifies k How to detect collisions How to recover from collisions(e.g. via de layed retransmissions Examples of random access MAc protocols slotted aloha and aloha CSMA and CSMACD 2021/2/9 10Random Access Protocols  When node has packet to send  Transmit at full channel data rate  No a priori coordination among nodes  Two or more transmitting nodes → “collision”  Random access MAC protocol specifies  How to detect collisions  How to recover from collisions (e.g., via delayed retransmissions)  Examples of random access MAC protocols:  Slotted ALOHA and ALOHA  CSMA and CSMA/CD 2021/2/9 10