与互联网不同，AT&T的网络是被充分管理的。

Unlike the Internet, AT&T's network was fully managed.

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差别越少，管理员需要记录的特定于环境的信息就越少，这样可以在大型拓扑中充分管理所有环境。

The fewer the differences, the less environment-specific knowledge the administrators must keep track of to sufficiently manage all of the environments in a large topology.

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