Suppose four active nodes—nodes A, B, C and D—are competing for access to a channel using slotted ALOHA. Assume each node has an infinite number of packets to send. Each node attempts to transmit in each slot with probability p. The first slot is numbered slot 1, the second slot is numbered slot 2, and so on. a. What is the probability that node A succeeds in transmitting in a slot? b. What is the probability that node A succeeds for the first time in slot 5? c. What is the probability that some node (either A, B, C or D) succeeds in slot 4? d. What is the probability that the first success occurs in slot 3? e. What is the efficiency of this four-node system?

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Network transmission cabling

A network is a collection of devices connected by communication links. A device can be a computer or any instrument capable of sending and receiving data or information formed by other nodes toward the network. A channel that connects people or things is known as a network. It sends the data from one place to another. It is the basic concept of a computer, network, and data communications.