A telephone modem is used to connect a personal computer to a host computer. The speed of the modem is 56 kbps, the one-way propagation delay is 100 ms, the packet size is 256 bytes, and the probability of an error in a packet is 10^-4. Find the efficiency of stop-and-wait ARQ. What window size N is needed to keep the channel busy when there are no transmission errors. For this window size finds the efficiency of the go-back-N and selective repeat protocols.

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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.