Describe how token passing works.

Token passing is a media access method designed to prevent collisions. In its most simple form it operates as follows:

1. A station that wishes to transmit on the network waits until it the token is free. 2. The sending station transmits its data with the token. 3. The token travels to the recipient without stopping at other stations. 4. The receiving station receives the token with the data and returns the token to the sender as an acknowledgment. 5. The sender receives acknowledgment and releases the token to next station. 6. The token continues being passed along the ring until it is "grabbed" by the next station that wants to transmit.