What is the multiple access problem, and why is it an issue for the link layer? What technologies have been developed to solve the problem, and what are their advantages and tradeoffs?
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Multiple access issue occurs in the configurations based on shared broadcast channel (e.g. LANs). In these situations the access of multiple nodes (sending and receiving) at the shared media channel must be coordinated.
The problem is characteristic for data link layer because one of the services offered is reliable delivery between two devices that are physically connected. If the access to the transmission environment is not properly set, this service can’t be provided at regular rates (multiple simultaneous transmissions suffer of interference)...
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