Determine the reliability between Devices A and B shown in Figure 1. Step-by-step calculations must be given. Also propose a design that can achieve 5-nines reliability. Assume that switches’ and routers’ reliability are 99.0% and 98.5%, respectively. The reliability of WAN A, WAN B and WAN C is shown in the figure. Note that the proposed design should utilize as low new switches or routers or WAN networks as possible.

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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.