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【简答题】
某网络的网络互联结构如下图所示。那么对于路由器R2，要到达网络40．0.0.0时，下一个路由器地址应该是（ ）。 A)20．0．0．6 B)30．0．0．6 C)30．0．0．7 D)40．0．0．7
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