这是我们所期望的，因为ntpd服务要求网络可达，以使它可以连接一个本地时间服务器。

This is as we would expect, since the NTPD service requires the network to be available so that it can contact a local time server.

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在传输层，我们使用传输风头，它可以在两个传输连接之间建立接口。

In the transport layer we find transport gateway, which can interface between two transport connections.

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