Explain about random access protocols
Answers
Random access protocols start from another scheme for access to the medium, the basic idea is that each station can start transmission at the time you want, but must respect some basic ideas.
In this type of protocol, no station controls or is controlled by other stations, nor does any station have priority over the others. There is also no rule about which station is next to transmit.
In this type of protocol it must be assumed that collisions can occur. When a collision occurs, the packets will be lost. However, in order to reduce collisions, some basic mechanisms can be implemented:
Listen to the transmission medium in case there is a transmitting packet. In this case, the station will wait until the medium is free.
Once a collision occurs, a protocol will be established to reduce the likelihood of a collision occurring again due to retransmissions from the same stations that previously collided.
Finally, the traffic generated by each station cannot be predicted, so the transmission is random.
Below are two types of random access protocols:
1) ALOHA protocol: whose interest lies mainly in being the first scheme that was implemented using random access.
2) CSMA protocol: on which practically all current local area networks are based, both those based on Ethernet and WIFI technology.