网络延时是向目的地发送请求到目的地实际接收到数据包之间的时间间隔。

The network latency is the time between sending a request to a destination and the destination actually receiving the sent packet.

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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。

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

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接收到重新传输数据包的确认。

Acknowledgment for the retransmitted packet is received.

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