error detection

error correction

synchronization

slowing down the communication

non-persistent then it results in randomised wait and sense

1-persistent then the channel is continually sensed

p-persistent then randomised retransmission is done

both (a) and (b)

TDM

Register insertion

Carrier sense systems

all of these

100

45

8

28

3000 bps

1500 bps

6000 bps

none of these