Switch-3 has 40 x 1 GbE (total 40 Gbps) access connections and 2 x 10 GbE uplinks (total 20 Gbps) to the distribution layer. The oversubscription ratio is calculated as access bandwidth to uplink bandwidth:
40 Gbps / 10 Gbps per uplink × 2 = 40:10 = 4:1.
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