This may mean the destination system interface is offline or there a network problem prevents connection.

这可能意味着目标系统接口已脱机或存在网络问题而不能连接。

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Is there a network latency problem?

存在网络延迟问题吗？

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Before you can identify whether there is a problem within your network, you first need to have a baseline performance on which to base your assumptions.

在判断网络中是否发生问题之前，需要先确定基线性能，然后据此做出假设。

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