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Some recent systems basically default to 1024 bytes of backlog size, but many servers on the network configure it to 128 bytes or less. Usually, the time threshold for retransmitting SYN-ACK is 5 seconds, which is twice the normal successful reception time. The default timeout time is 3 seconds, and the time from the first SYN-ACK to its TCB being recovered is 189 seconds.于是，他将手伸向离自己最近的一碟栗子糕。又戏笑道：你这么像我张家人，说不定真跟我张家有渊源。话不投机半句多，他就此三两步上了马车。若不然，几年后，有人翻出这事来，说咱板栗曾经杀人，那时长十张嘴也辨不清了。Law of Demeter (LoD) is also called Least Knowledge Principle (LKP), which means that an object should know as little as possible about other objects. In other words, a module or object should interact with other entities as little as possible, making the system functional modules relatively independent, so that when a module is modified, the fewer modules will be affected and the easier it will be to expand.