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-**成本和性能收益**:分布式系统的网络很少是同构的,系统很可能跨多个网络 zone 和 region。在每个 zone 内部,网络的利用率相对较低;zone 之间利用率经常达到上限。智能负载均衡可以最大限度地将请求流量保持在 zone 内部,既提高了性能(延迟降低),又减少了整体的系统成本(减少跨 zone 带宽及光纤成本)。