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In today's scenario, the authors see that scaling of heterogeneous systems is exponentially increasing. Network operators design their backbone networks to accommodate all traffic efficiently (e.g., without congestion or large delays). However, even if a backbone network suitable for actual traffic is constructed, traffic could significantly differ from the initial traffic as time goes on. As a result, the previously constructed backbone network becomes no longer suitable to the current traffic; it may happen that utilizations of some links are extremely high while utilizations of other links are extremely low.
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