CSMA/CD

(carrier sense multipl acces/collision Detection).


 When a host want to place data on the wire, it will “sense” the wire to find whether there is a single already on the wire. If there is traffic already  in the host will wait and if their is no traffic, it will place the data in the medium.

TOKEN PASSING

In CSMA/CD and CSMA/CA the chance of collision are there. As the number of host in the network increase, the chance of collision also will become more. In token passing , when a host want to transmit data.

Workstation, the workstation cane take  the token from the network, fill it with data mark the token as being used and place the token back to the network.

re, it will “sense” the wire to find whether there is a single already on the wire. If there is traffic already  in the host will wait and if their is no traffic, it will place the data in the medium.In CSMA/CD( carrier sense multipl acces/collision Detection)Access method , the  every host equal to the to the wire and can place data on the wire when the wire is free from traffic.


CSMA/CA(carrier sense multiple access/collision

In CSMA/CA Before a host sends real data on the wire it will “sense” the wire to check if the wire is free. If the wire is free. It will send a piece of “dummy” data on the wire to see whether it collides with any other data. If it dose not collide, the host will assume that the real data also will not collide.

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