During login, a host may perform a reverse lookup on the IP address of the source address on the packets it receives.

在登录期间，主机可能会对它收到的数据包的源地址的IP地址执行反向查找。

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Depending on the configuration of that host, it can take some time for the lookup to fail and the login to continue.

根据主机的配置不同，查找失败会花费一定的时间，然后继续登录。

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The example also shows the use of the -n switch, which prints numeric host addresses, thereby avoiding name lookup and resolution and speeding up the trace.

这个示例还演示- n选项的用途，它输出数字的主机地址，从而避免名称查询和解析，可以提高跟踪速度。

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