Controlled Access Protocol (Media Access Control) in Computer Network

Описание: In controlled access, the stations seek information from one another to find which station has the right to send.
It grants permission to only one node at a time to transmit the data.
It allows only one node to send at a time, to avoid collision of messages on shared medium. 
No station can send the data unless it has been authorized by the other stations.
Controlled access protocols are as follows:
1. Reservation
2. Polling
3. Token Passing
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