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Pure ALOHA and Slotted ALOHA are two fundamental Medium Access Control (MAC) protocols used for resolving data transmission collisions in a shared communication channel. Both are random access protocols and were originally developed for wireless network communication. Their primary purpose is to allow multiple users to transmit data over a shared medium without a centralized controller. However, they differ in terms of how the transmissions are managed, synchronized, and how efficient they are in handling data collisions. In Pure ALOHA, a station is allowed to transmit data whenever it has data to send. There is no synchronization or time-slot mechanism involved. After transmitting the data packet, the station waits for an acknowledgment (ACK). If an acknowledgment is not received within a fixed time (typically equal to twice _____ __________ _____ _____ ______ __________ _____ _______ __________.
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