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A four-node ring assumes minimum of four links to form a ring. The loss of a link would result in the loss of a direct connection between at least two nodes, rendering the ring a four-node cascade. You should still have availability with the loss of a link between two nodes; however, performance could be degraded by up to 1/4, depending on traffic flow and workloads. Losses of additional links between any node pair would then impact availability and render the network into multiple subnetworks.
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