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.
其他主机在收到数据包的时候，看到这个数据库的目的地址跟自己不匹配，就会把数据包丢弃掉。
Other leader is in when receiving data to wrap, the purpose address that sees this database does not match with oneself, can discard data bag.
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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