Question
What is the primary concept behind the ALOHA protocol in
network communication?Solution
The ALOHA protocol is a fundamental network protocol used to manage access to a shared communication medium, such as a wireless channel. It operates on a simple principle: when a device has data to send, it transmits the data at a random time without checking if the channel is clear. ALOHA is based on the idea of "random access" or "contention-based" communication, where multiple devices compete for the same communication channel. There are two main variations of the ALOHA protocol: • Pure ALOHA: Devices transmit whenever they have data to send. If a collision occurs (i.e., two devices transmit simultaneously), the data is lost, and the devices wait a random amount of time before attempting to retransmit. • Slotted ALOHA: The time is divided into discrete slots, and devices are allowed to transmit only at the beginning of these slots. This reduces the chance of collisions compared to Pure ALOHA.
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