MAC (Medium access control) Protocol
WIRELESS
// Hidden terminal Problem
Career sensing is sensing the collisions that happens locally not at the receiver.
A->B<-C
Can't do collision detection.
RTS -> request to send
CTS -> Clear to send
CSMA/CA Carrier Sense Multiple Access / Collision Avoidance
WiFi uses CSMA CA
# Exposed terminal problem
Modified CA: RTS/CTS/DS/Data/Ack
DS Data-Sending
RTS from A to B
CTS from B to A
DS from A to B
DATA frame from A to B
ACK from B to A.